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126 results on '"Mutabaruka, Patrick"'

3. Particle dynamics simulation of wet granulation in a rotating drum

Author

Vo, Thanh Trung, Nezamabadi, Saeid, Mutabaruka, Patrick, Delenne, Jean-Yves, Izard, Edouard, Pellenq, Roland, and Radjai, Farhang

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

We simulate the granulation process of solid spherical particles in the presence of a viscous liquid in a horizontal rotating drum by using molecular dynamics simulations in three dimensions. The numerical approach accounts for the cohesive and viscous effects of the binding liquid, which is assumed to be transported by wet particles and re-distributed homogeneously between wet particles in contact. We investigate the growth of a single granule introduced into the granular bed and the cumulative numbers of accreted and eroded particles as a function of time for a range of values of material parameters such as mean particle size, size polydispersity, friction coefficient, and liquid viscosity. We find that the granule growth is an exponential function of time, reflecting the decrease of the number of free wet particles. The influence of material parameters on the accretion and erosion rates reveals the nontrivial dynamics of the granulation process. It opens the way to a granulation model based on the realistic determination of particle-scale mechanisms of granulation.

Published
2018

6. A simulation technique for slurries interacting with moving parts and deformable solids with applications

Author

Mutabaruka, Patrick and Kamrin, Ken

Subjects
Computer Science - Computational Engineering, Finance, and Science, Miscellaneous
Abstract

A numerical method for particle-laden fluids interacting with a deformable solid domain and mobile rigid parts is proposed and implemented in a full engineering system. The fluid domain is modeled with a lattice Boltzmann representation, the particles and rigid parts are modeled with a discrete element representation, and the deformable solid domain is modeled using a Lagrangian mesh. The main issue of this work, since separately each of these methods is a mature tool, is to develop coupling and model-reduction approaches in order to efficiently simulate coupled problems of this nature, as occur in various geological and engineering applications. The lattice Boltzmann method incorporates a large-eddy simulation technique using the Smagorinsky turbulence model. The discrete element method incorporates spherical and polyhedral particles for stiff contact interactions. A neo-Hookean hyperelastic model is used for the deformable solid. We provide a detailed description of how to couple the three solvers within a unified algorithm. The technique we propose for rubber modeling/coupling exploits a simplification that prevents having to solve a finite-element problem each time step. We also develop a technique to reduce the domain size of the full system by replacing certain zones with quasi-analytic solutions, which act as effective boundary conditions for the lattice Boltzmann method. The major ingredients of the routine are are separately validated. To demonstrate the coupled method in full, we simulate slurry flows in two kinds of piston-valve geometries. The dynamics of the valve and slurry are studied and reported over a large range of input parameters.

Published
2017

11. Geometrical network of granular materials under isochoric cyclic shearing

Author

Yang Ming, Taiebat Mahdi, Mutabaruka Patrick, and Radjai Farhang

Subjects
Physics, QC1-999
Abstract

We use three-dimensional particle dynamics simulations to investigate the microstructure evolution of granular material subjected to isochoric cyclic shearing, driving the system to a liquefaction state. The cyclically sheared assembly presents a realistic macroscopic response as observed in physical experiments. By analyzing the contact network evolution in the post-liquefaction period, we show that the onset of liquefaction state is characterized by a sudden drop of coordination number and a fragile particle connectivity network. The simulation suggests a critical coordination number for exiting the liquefaction state. Evolution of fabric anisotropy combined with coordination number implies the isotropic and anisotropic gain or loss of contacts at certain durations of a post-liquefaction loading cycle.

Published
2021
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14. Strength of wet agglomerates of spherical particles: effects of friction and size distribution

Author

Vo Thanh-Trung, Mutabaruka Patrick, Delenne Jean-Yves, Nezamabadi Saeid, and Radjai Farhang

Subjects
Physics, QC1-999
Abstract

We investigate the mechanical behavior of wet granular agglomerates composed of spherical particles by means of molecular dynamics simulations. The capillary cohesion force is modeled as an attraction force at the contact between two particles and expressed as an explicit function of the gap and volume of the liquid bridge. We are interested in the effect of the friction coefficient between primary particles. The agglomerates are subjected to diametrical compression tests. We find that the deformation is ductile involving particle rearrangements. However, a well-defined stress peak is observed and the peak stress is used as a measure of the compressive strength of the agglomerate. The strength increases with friction coefficient but levels off at friction coefficients above 0.4. Furthermore, the compressive strength is an increasing function of particle size span.

Published
2017
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15. Effect of particle size distribution on 3D packings of spherical particles

Author

Taiebat Mahdi, Mutabaruka Patrick, Pellenq Roland, and Radjai Farhang

Subjects
Physics, QC1-999
Abstract

We use molecular dynamics simulations of frictionless spherical particles to investigate a class of polydisperse granular materials in which the particle size distribution is uniform in particle volumes. The particles are assembled in a box by uniaxial compaction under the action of a constant stress. Due to the absence of friction and the nature of size distribution, the generated packings have the highest packing fraction at a given size span, defined as the ratio α of the largest size to the smallest size. We find that, up to α = 5, the packing fraction is a nearly linear function of α. While the coordination number is nearly constant due to the isostatic nature of the packings, we show that the connectivity of the particles evolves with α. In particular, the proportion of particles with 4 contacts represents the largest proportion of particles mostly of small size. We argue that this particular class of particles occurs as a result of the high stability of local configurations in which a small particle is stuck by four larger particles.

Published
2017
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16. Additive rheology of complex granular flows

Author

Trung Vo, Thanh, Nezamabadi, Saeid, Mutabaruka, Patrick, Delenne, Jean-yves, Radjai, Farhang, Trung Vo, Thanh, Nezamabadi, Saeid, Mutabaruka, Patrick, Delenne, Jean-yves, and Radjai, Farhang

Abstract

Granular flows are omnipresent in nature and industrial processes, but their rheological properties such as apparent friction and packing fraction are still elusive when inertial, cohesive and viscous interactions occur between particles in addition to frictional and elastic forces. Here we report on extensive particle dynamics simulations of such complex flows for a model granular system composed of perfectly rigid particles. We show that, when the apparent friction and packing fraction are normalized by their cohesion-dependent quasistatic values, they are governed by a single dimensionless number that, by virtue of stress additivity, accounts for all interactions. We also find that this dimensionless parameter, as a generalized inertial number, describes the texture variables such as the bond network connectivity and anisotropy. Encompassing various stress sources, this unified framework considerably simplifies and extends the modeling scope for granular dynamics, with potential applications to powder technology and natural flows. Granular materials are abundant in nature, but we haven't fully understood their rheological properties as complex interactions between particles are involved. Here, Vo et al. show that granular flows can be described by a generalized dimensionless number based on stress additivity.

Published
2020
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17. Evolution of wet agglomerates inside inertial shear flow of dry granular materials

Author

Vo, Thanh-trung, Mutabaruka, Patrick, Nezamabadi, Saeid, Delenne, Jean-yves, Radjai, Farhang, Vo, Thanh-trung, Mutabaruka, Patrick, Nezamabadi, Saeid, Delenne, Jean-yves, and Radjai, Farhang

Abstract

We use particle dynamics simulations to investigate the evolution of a wet agglomerate inside homogeneous shear flows of dry particles. The agglomerate is modeled by introducing approximate analytical expressions of capillary and viscous forces between particles in addition to frictional contacts. During shear flow, the agglomerate may elongate, break, or be eroded by loss of its capillary bonds and primary particles. By systematically varying the shear rate and surface tension of the binding liquid, we characterize the rates of these dispersion modes. All the rates increase with increasing inertial number of the flow and decreasing cohesion index of the agglomerate. We show that the data points for each mode collapse on a master curve for a dimensionless scaling parameter that combines the inertial number and the cohesion index. The erosion rate vanishes below a cutoff value of the scaling parameter. This leads to a power-law borderline between the vanishing erosion states and erosion states in the phase space defined by the inertial number and the cohesion index.

Published
2020
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19. DEM-LBM Approach for the Simulation of Dense Granular Suspension

Author

Amarsid, Lhassan, Mutabaruka, Patrick, Radjai, Farhang, Delenne, Jean-Yves, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
Physics::Fluid Dynamics, Granular Suspensions, Discrete Element Modeling, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, Lattice Boltzmann Method, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, [PHYS.MECA]Physics [physics]/Mechanics [physics], [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; Numerical simulations of dense suspensions with a high resolution of the liquid phase (below the particles scale) requires two-way coupling of particle dynamics with stepwise resolution of Navier-Stokes equations for the fluid phase. The Lattice Boltzmann Method (LBM) provides a versatile approach, which has shown its high robustness for the simulation of simple situations such as the free fall of a particle inside a fluid and for the calculation of the permeability of a packing of fixes particles [1,2]. We show here how LBM can be coupled with DEM and parametrised for the simulations of suspensions with several thousands of particles. In particular, we show the differences between the MRT and BGK models for the collision term. Then, we briefly present a parametric study of the effects offluid properties (viscosity, density), particle properties (size, density) and boundary conditions (shear rate, confining pressure) in immersed flows. We show that our results, in terms of effective viscosities of the flow, are in excellent agreement with reported experiments in literature [3].[1] Aidun, C.K. and Clausen, J.R., 2010. Lattice-Boltzmann method for complex flows. Annual review of fluid mechanics, 42, pp.439-472.[2] Mutabaruka, P., Delenne, J.Y., Soga, K. and Radjai, F., 2014. Initiation of immersed granular avalanches. Physical Review E, 89(5), p.052203.[3] Amarsid, L., Delenne, J.Y., Mutabaruka, P., Monerie, Y., Perales, F. and Radjai, F., 2017. Viscoinertial regime of immersed granular flows. Physical Review E, 96(1), p.012901.

Published
2019

20. Numerical modeling of wet agglomerates

Author

Trung Vo, Thanh, Mutabaruka, Patrick, Nezamabadi, Saeid, Delenne, Jean-Yves, Radjai, Farhang, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
diametrical compression, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, granular matter, agglomerate, plastic strength, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, [PHYS.MECA]Physics [physics]/Mechanics [physics], Discrete Element Method, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; We study the effects of material parameters on the plastic properties and texture of wet agglomerates composed of solid particles by using molecular dynamics simulations under diametrical compression. The numerical algorithm with a capillary cohesion law in which the cohesion force is an explicit function of the gap between particles and liquid-vapor surface tension [1], and the binding liquid content is mainly accounted for a rupture distance druptwith the binding liquid assumed to be distributed homogeneously inside wet agglomerates [2, 3]. We present the method and analyze the behavior and evolution of the microstructure during diametrical compression. We find that due to the rearrangement of wet primary particles during compression, the granule shows a ductile behaviour. The compressive strength of wet agglomerates reaches a plateau before failure due to the irreversible loss of wet contacts between primary particles.

Published
2019

21. DEM simulations of granulation process in 3D rotating drum

Author

Trung Vo, Thanh, Mutabaruka, Patrick, Nezamabadi, Saeid, Delenne, Jean-Yves, Radjai, Farhang, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, granulation, [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, rotating drum, granular matter, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, [PHYS.MECA]Physics [physics]/Mechanics [physics], capillary bond, Discrete Element Method, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience; We study the agglomeration process of wet granular materials in a rotating drum by using 3D DEM simulations. Agglomeration of fine particles is presented in many industrial processes such as powder metallurgy, iron-making industry, food and pharmaceutical industries, as well as in natural processes. Fine granular materials are prepared and mixed in required proportions, compacted into a granule or tablet and finally sintered to acquire sufficient mechanical strength and toughness needed for subsequent operations. We present a numerical model for the agglomeration of a single granule in rotating drum [1, 2, 3]. The particles interact throughcapillary liquid bridges, which are modeled by accounting for the cohesive and viscous forces expressed analytically as a function of different parameters such as the distance between primary particles, liquid volume and viscosity, surface tension and particle sizes. The model also assumes that the liquid is transported by the primary particles modeled as agglomerates of fine particles. We find that this model is able to simulate the granulation of particles in a rotating drum in which a given amount of liquid is homogeneously re-distributed. Our simulations show that the granule size increases exponentially with the number of drum rotations and in proportion to the amount of liquid in the pendular state. We investigate the effects of process and material parameters such as particle size distribution, mean particle size, friction coefficient between the primary particles and liquid viscosity in each agglomeration process.

Published
2019

22. Granulation of wet granular medium in rotating drum

Author

Vo, Thanh Trung, Mutabaruka, Patrick, Nezamabadi, Saeid, Delenne, Jean-Yves, Radjai, Farhang, Danang Architecture University (DAU), Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering
Abstract

International audience; In this work, we study the agglomeration process of wet granular materials in rotating drum. Agglomeration of fine particles is used in many industrial processes such as powder metallurgy, iron-making industry, food and pharmaceutical industries. Fine granular materials are prepared and mixed in required proportions, compacted into a granule or tablet and finally sintered to acquire sufficient mechanical strength and toughness needed for subsequent operations. We present a numerical model for the agglomeration of wet particles in rotating drum [1, 2]. The particles interact through capillary liquid bridges, which are modeled by accounting for the cohesive and viscous forces expressed analytically as a function of different parameters such as the distance between primary particles, liquid volume and viscosity, surface tension and particle sizes. The model also assumes that the liquid is transported by the primary particles modeled as agglomerates of fine particles. We find that this model is able to simulate the granulation of particles in a rotating drum in which a given amount of liquid is homogeneously re-distributed. Our simulations show that the granule size increases exponentially with the number of drum rotations and in proportion to the amount of liquid. We investigate the effects of process and material parameters such as particle size distribution, mean particle size, friction coefficient between the primary particles and liquid viscosity in each agglomeration process.

Published
2019

23. The ductile behaviour and microstructure of wet agglomerates

Author

Trung Vo, Thanh, Mutabaruka, Patrick, Nezamabadi, Saeid, Delenne, Jean-Yves, Radjai, Farhang, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Danang Architecture University (DAU), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
Wet agglomerate, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Granular matter, Discrete Element Method, Capillary bond
Abstract

International audience; By using molecular dynamics simulations in three dimensions, we investigate the effects of material parameters and binding liquid content on the plastic properties and texture of wet agglomerates composed of solid particles under diametrical compression test. The numerical algorithm with a capillary cohesion law in which the cohesion force is an explicit function of the gap between primary particles and liquid- vapor surface tension [1], the binding liquid content is mainly accounted for a debonding distance with the binding liquid assumed to be distributed homogeneously inside wet agglomerates [2, 3]. We present the numerical method and analyze the mechanical strength and evolution of the microstructure during diametrical compression. We find that the wet agglomerate shows the ductile behavior due to the rearrangement of wet primary particles during the compression. The compressive strength of wet agglomerates reaches a plateau before failure due to the irreversible loss of wet contacts between primary particles. The plastic threshold of wet agglomerate is proportional to the cohesive stress which increases with the size span and nearly liner function of rupture distance, the cohesive stress is defined from the ratio between the liquid surface tension and the mean diameter of primary particles.

Published
2019

24. Granulation of wet granular media in rotating drum

Author

Radjai, Farhang, Nezamabadi, Saeid, Mutabaruka, Patrick, Delenne, Jean-Yves, Trung Vo, Thanh, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, [PHYS.MECA]Physics [physics]/Mechanics [physics], ComputingMilieux_MISCELLANEOUS, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

International audience

Published
2019

25. Agglomeration of wet particles in dense granular flows

Author

Vo, Thanh Trung, Nezamabadi, Saeid, Mutabaruka, Patrick, Delenne, Jean-yves, Izard, Edouard, Pellenq, Roland, Radjai, Farhang, Vo, Thanh Trung, Nezamabadi, Saeid, Mutabaruka, Patrick, Delenne, Jean-yves, Izard, Edouard, Pellenq, Roland, and Radjai, Farhang

Abstract

In order to get insight into the wet agglomeration process, we numerically investigate the growth of a single granule inside a dense flow of an initially homogeneous distribution of wet and dry particles. The simulations are performed by means of the discrete element method and the binding liquid is assumed to be transported by the wet particles, which interact via capillary and viscous force laws. The granule size is found to be an exponential function of time, reflecting the conservation of the amount of liquid and the decrease of the number of available wet particles inside the flow during agglomeration. We analyze this behavior in terms of the accretion and erosion rates of wet particles for a range of different values of material parameters such as mean particle size, size polydispersity, friction coefficient and liquid viscosity. In particular, we propose a phase diagram of the granule growth as a function of the mean primary particle diameter and particle size span, which separates the parametric domain in which the granule grows from the domain in which the granule does not survive.

Published
2019
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26. Agglomerates of wet particles: effect of size distribution

Author

Trung Vo, Thanh, Mutabaruka, Patrick, Nezamabadi, Saeid, Delenne, Jean-Yves, Izard, Edouard, Pellenq, Rolland, Radjai, Farhang, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Danang Architecture University (DAU), Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), ArcelorMittal Maizières Research SA, and ArcelorMittal

Subjects
capillary force law, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], diametrical compression, agglomerates, granular matter, plastic strength, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, discrete element method
Abstract

International audience; We analyze the strength of agglomerates of wet frictional particles subjected to axial compression by means of particle dynamics simulations. The numerical model accounts for the cohesive and viscous effects of the binding liquid up to a debonding distance [1]. We show that wet agglomerates undergo plastic deformation due to the rearrangements of primary particles during compression [2]. The compressive strength is characterized by the plastic threshold before the onset of failure by the irreversible loss of wet contacts between primary particles [3]. The agglomerate plastic threshold is proportional to the characteristic cohesive stress defined from the liquid-vapor surface tension and the mean diameter of primary particles, with a pre-factor that is a nearly linear function of the debonding distance and increases with size span. We analyze the effect of particle size distribution and show that the plastic strength is an increasing function of the size ratio when the size of the particles in the largest size class is increased.References1. F. Radjai, F. Dubois, Discrete-element modeling of granular materials (Wiley-Iste, 2011)2. T-Trung. Vo, P. Mutabaruka, J-Y. Delenne, S. Nezamabadi, F. Radjai, EPJ Web Conf. 140, 08021 (2017)3. T-Trung. Vo, P. Mutabaruka, S. Nezamabadi, J.Y. Delenne, E. Izard, R. Pellenq, F. Radjai, Mechanics Research Communications 92, (2018)

Published
2018

27. Micromechanics of the granulation process in wet granular flows

Author

Vo, Thanh-Trung, Nezamabadi, Saeid, Mutabaruka, Patrick, Delenne, Jean-Yves, Pellenq, Roland, Izard, Edouard, Radjai, Farhang, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), ArcelorMittal Maizières Research SA, ArcelorMittal, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, granulation, rotating drum, iron ores, capillary bridge, molecular dynamics
Abstract

International audience; The rolling granulator is an important device, in which agglomeration of fine particles is used in many industrial processes such as powder metallurgy, iron-making industry, food and pharmaceutical industries. Fine granular materials are prepared and mixed in required proportions, compacted into a granule or tablet and finally sintered to acquire sufficient mechanical strength and toughness needed for subsequent operations. We present a numerical model for the agglomeration process of wet granular materials. The particles interact through capillary liquid bridges, which are modeled by accounting for the cohesive and viscous forces expressed analytically as a function of different parameters such as the distance between primary particles, particle sizes, liquid volume, viscosity and surface tension of the liquid binding. The model also assumes that the liquid is transported homogeneously by the primary particles modeled as agglomerates of finer particles. We find that this model is able to simulate the agglomeration of particles in a rotating drum. Our simulations show that the granule size increases exponentially with the number of drum rotations and in proportion to the amount of liquid. We investigate both effects of process and material parameters such as filling level, the rotation speed of the drum, particle size distribution, friction coefficient between the primary particles and viscosity of the binding liquid on the granule growth, the accretion and erosion dynamics of granule inside the granular flow. We also determine the granulation domains in the relations between the mean particle size, liquid viscosity and the size ratio distribution.

Published
2018

28. Steady and unsteady granular flows inside a viscous fluid

Author

Radjai, Farhang, Amarsid, Lhassan, Mutabaruka, Patrick, Delenne, Jean-Yves, Physique et Mécanique des Milieux Divisés (PMMD), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

29. 3D simulations of the granulation of wet granular materials

Author

Vo, Thanh-Trung, Mutabaruka, Patrick, Nezamabadi, Saeid, Delenne, Jean-Yves, Radjai, Farhang, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Da Nang Architecture University, Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, rotating drum, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], iron ore, size ratio, capillary bridge, ComputingMilieux_MISCELLANEOUS, molecular dynamics, [SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph]
Abstract

International audience

Published
2018

30. Particle dynamics simulation of wet granulation in a rotating drum

Author

Vo, Thanh-Trung, Nezamabadi, Saeid, Mutabaruka, Patrick, Delenne, Jean-Yves, Izard, Edouard, Pellenq, Roland, and Radjai, Farhang

Subjects
Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, structure granulaire, Granular matter, Granulation, Capillary bond, Discrete Element Method, Rotating drum, granulation, Process Engineering, particule en suspension, Astrophysics::Solar and Stellar Astrophysics, Génie des procédés, simulation
Abstract

We simulate the granulation process of solid spherical particles in the presence of a viscous liquid in a horizontal rotating drum by using molecular dynamics simulations in three dimensions. The numerical approach accounts for the cohesive and viscous effects of the binding liquid, which is assumed to be transported by wet particles and re-distributed homogeneously between wet particles in contact. We investigate the growth of a single granule introduced into the granular bed and the cumulative numbers of accreted and eroded particles as a function of time for a range of values of material parameters such as mean particle size, size polydispersity, friction coefficient, and liquid viscosity. We find that the granule growth is an exponential function of time, reflecting the decrease of the number of free wet particles. The influence of material parameters on the accretion and erosion rates reveals the nontrivial dynamics of the granulation process. It opens the way to a granulation model based on the realistic determination of particle-scale mechanisms of granulation.

Published
2018

31. Simulation technique for slurries interacting with moving parts and deformable solids with applications

Author

Massachusetts Institute of Technology. Department of Mechanical Engineering, MIT Energy Initiative, Mutabaruka, Patrick, Kamrin, Kenneth N, Massachusetts Institute of Technology. Department of Mechanical Engineering, MIT Energy Initiative, Mutabaruka, Patrick, and Kamrin, Kenneth N

Abstract

A numerical method for particle-laden fluids interacting with a deformable solid domain and mobile rigid parts is proposed and implemented in a full engineering system. The fluid domain is modeled with a lattice Boltzmann representation, the particles and rigid parts are modeled with a discrete element representation, and the deformable solid domain is modeled using a Lagrangian mesh. The main issue of this work, since separately each of these methods is a mature tool, is to develop coupling and model-reduction approaches in order to efficiently simulate coupled problems of this nature, as in various geological and engineering applications. The lattice Boltzmann method incorporates a large eddy simulation technique using the Smagorinsky turbulence model. The discrete element method incorporates spherical and polyhedral particles for stiff contact interactions. A neo-Hookean hyperelastic model is used for the deformable solid. We provide a detailed description of how to couple the three solvers within a unified algorithm. The technique we propose for rubber modeling/coupling exploits a simplification that prevents having to solve a finite-element problem at each time step. We also developed a technique to reduce the domain size of the full system by replacing certain zones with quasi-analytic solutions, which act as effective boundary conditions for the lattice Boltzmann method. The major ingredients of the routine are separately validated. To demonstrate the coupled method in full, we simulate slurry flows in two kinds of piston valve geometries. The dynamics of the valve and slurry are studied and reported over a large range of input parameters. Keywords Discrete elements method Lattice Boltzmann Fluid–particle interaction Smagorinsky turbulence model Hyperelastic model Neo-Hookean elastic rubber model, United States. Army Research Office (grant W911 NF-15-1-0598), Schlumberger Limited

Published
2018

32. Effect of particle size distribution on 3D packings of spherical particles

Author

Taiebat, Mahdi, Mutabaruka, Patrick, Pellenq, Roland, Radjai, Farhang, Taiebat, Mahdi, Mutabaruka, Patrick, Pellenq, Roland, and Radjai, Farhang

Abstract

We use molecular dynamics simulations of frictionless spherical particles to investigate a class of polydisperse granular materials in which the particle size distribution is uniform in particle volumes. The particles are assembled in a box by uniaxial compaction under the action of a constant stress. Due to the absence of friction and the nature of size distribution, the generated packings have the highest packing fraction at a given size span, defined as the ratio á of the largest size to the smallest size. We find that, up to á = 5, the packing fraction is a nearly linear function of á. While the coordination number is nearly constant due to the isostatic nature of the packings, we show that the connectivity of the particles evolves with á. In particular, the proportion of particles with 4 contacts represents the largest proportion of particles mostly of small size. We argue that this particular class of particles occurs as a result of the high stability of local configurations in which a small particle is stuck by four larger particles.

Published
2017
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33. Strength of wet agglomerates of spherical particles: effects of friction and size distribution

Author

Vo, Thanh-trung, Mutabaruka, Patrick, Delenne, Jean-yves, Nezamabadi, Saeid, Radjai, Farhang, Vo, Thanh-trung, Mutabaruka, Patrick, Delenne, Jean-yves, Nezamabadi, Saeid, and Radjai, Farhang

Abstract

We investigate the mechanical behavior of wet granular agglomerates composed of spherical particles by means of molecular dynamics simulations. The capillary cohesion force is modeled as an attraction force at the contact between two particles and expressed as an explicit function of the gap and volume of the liquid bridge. We are interested in the effect of the friction coefficient between primary particles. The agglomerates are subjected to diametrical compression tests. We find that the deformation is ductile involving particle rearrangements. However, a well-defined stress peak is observed and the peak stress is used as a measure of the compressive strength of the agglomerate. The strength increases with friction coefficient but levels off at friction coefficients above 0.4. Furthermore, the compressive strength is an increasing function of particle size span.

Published
2017
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34. Scaling behavior of immersed granular flows

Author

Amarsid, L., Delenne, J.-y., Mutabaruka, Patrick, Monerie, Y., Perales, F., Radjai, F., Amarsid, L., Delenne, J.-y., Mutabaruka, Patrick, Monerie, Y., Perales, F., and Radjai, F.

Abstract

The shear behavior of granular materials immersed in a viscous fluid depends on fluid properties (viscosity, density), particle properties (size, density) and boundary conditions (shear rate, confining pressure). Using computational fluid dynamics simulations coupled with molecular dynamics for granular flow, and exploring a broad range of the values of parameters, we show that the parameter space can be reduced to a single parameter that controls the packing fraction and effective friction coefficient. This control parameter is a modified inertial number that incorporates viscous effects.

Published
2017
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35. Viscoinertial regime of immersed granular flows

Author

Amarsid, L., Delenne, J. -y., Mutabaruka, Patrick, Monerie, Y., Perales, F., Radjai, F., Amarsid, L., Delenne, J. -y., Mutabaruka, Patrick, Monerie, Y., Perales, F., and Radjai, F.

Abstract

By means of extensive coupled molecular dynamics-lattice Boltzmann simulations, accounting for grain dynamics and subparticle resolution of the fluid phase, we analyze steady inertial granular flows sheared by a viscous fluid. We show that, for a broad range of system parameters (shear rate, confining stress, fluid viscosity, and relative fluid-grain density), the frictional strength and packing fraction can be described by a modified inertial number incorporating the fluid effect. In a dual viscous description, the effective viscosity diverges as the inverse square of the difference between the packing fraction and its jamming value, as observed in experiments. We also find that the fabric and force anisotropies extracted from the contact network are well described by the modified inertial number, thus providing clear evidence for the role of these key structural parameters in dense suspensions.

Published
2017
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36. Viscoinertial regime of immersed granular flows

Author

MIT Energy Initiative, Mutabaruka, Patrick, Radjai, Franck, Amarsid, L., Delenne, J.-Y., Monerie, Y., Perales, F., MIT Energy Initiative, Mutabaruka, Patrick, Radjai, Franck, Amarsid, L., Delenne, J.-Y., Monerie, Y., and Perales, F.

Abstract

By means of extensive coupled molecular dynamics–lattice Boltzmann simulations, accounting for grain dynamics and subparticle resolution of the fluid phase, we analyze steady inertial granular flows sheared by a viscous fluid. We show that, for a broad range of system parameters (shear rate, confining stress, fluid viscosity, and relative fluid-grain density), the frictional strength and packing fraction can be described by a modified inertial number incorporating the fluid effect. In a dual viscous description, the effective viscosity diverges as the inverse square of the difference between the packing fraction and its jamming value, as observed in experiments. We also find that the fabric and force anisotropies extracted from the contact network are well described by the modified inertial number, thus providing clear evidence for the role of these key structural parameters in dense suspensions.

Published
2017

37. Triggering mechanisms of an immersed granular avalanche

Author

Mutabaruka, Patrick, Delenne, Jean-Yves, Soga, Kenichi, Radjai, Farhang, Multi-Scale Material Science for Energy and Environment ((MSC)2 UMI3466 CNRS-MIT), CNRS-MIT, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Engineering Department, University of Cambridge, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Multi-Scale Material Science for Energy and Environment ( (MSC)2 UMI3466 CNRS-MIT ), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Divisés ( PMMD ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
Published
2016

39. Destabilization of immersed granular avalanches

Author

Mutabaruka, Patrick, Delenne, Jean-Yves, Soga, Kenichi, Radjai, Farhang, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Engineering Departement, University of Cambridge, Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Divisés ( PMMD ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro )

Subjects
déstabilisation, avalanche, [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], numerical simulation, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], simulation numérique, Mécanique des matériaux, Mechanics of materials
Abstract

By means of 3D coupled molecular dynamics/Lattice Boltzmann simulations, we analyze the destabilization process of a granular bed of spherical particles inclined above its angle of repose and immersed in a viscous fluid [1]. Extensive simulations were performed for different values of the packing fraction and slope angle. We study the evolution of macroscopic observables such as shear strain, packing fraction and excess pore pressure. We then analyze the contact network anisotropy. Two regimes are evidenced as in experiments [2,3]: a loose regime where the slope fails spontaneously and a dense regime where the failure is delayed as a result of negative excess pore pressure built up in reaction to the dilation of the bed. The two regimes belong to the packing fractions below and above 0.59, respectively. We focus in more detail on the creep-like deformation of the inclined bed in the dense regime. The time evolution of the packing fraction and shear strain scale with a characteristic time obtained from a model based on the balance of granular stresses in the presence of a pore excess pressure and the relation of the latter with dilatancy controlled by Darcian drag forces. The cumulative shear strain at failure is found to be around 0.2, close to the experimental value [2], irrespective of the initial packing fraction and inclination angle. In the same way, the time and packing fraction at failure are correctly predicted by the model. A noticeable finding is that the network deforms by distortion at nearly constant connectivity. The contact network anisotropy grows with shear strain, and slope failure is triggered when the anisotropy levels off. The anisotropy thus appears as an internal variable, reflecting the distortion of the contact network. The independence of the internal friction angle with respect to the initial packing fraction and its dependence on the slope angle were studied and shown to be a consequence of slope stabilization by the cohesive-like effect of negative excess pore pressure. It is also interesting to note that the transition from stable equilibrium to inertial flow in the presence of a fluid is accompanied by large fluctuations. As soon as the capacity of volume change by distortion is nearly exhausted, slope instability is triggered by the fluctuations and amplified by lubrication forces as the avalanches proceeds.

Published
2014

40. Modélisation numérique des milieux granulaires immergés : initiation et propagation des avalanches dans un fluide

Author

Mutabaruka, Patrick, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires (PMMG), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier II - Sciences et Techniques du Languedoc, and DELENNE Jean-Yves(jean-yves.delenne@univ-montp2.fr)

Subjects
numerical simulations, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Lattice Boltzmann method, Immersed granular materials, matériaux granulaire immerge, Simulations numériques, méthode de Lattice Boltzmann
Abstract

By means of numerical simulations, we investigate the behavior of granular materials immersed in a fluid. Numerical developments were carried out to interface the Lattice Boltzmann Method for fluid dynamics with the Contact Dynamics method in 2D and with the Molecular Dynamics method in 3D for the simulation of the grains. Extensive simulations were applied to study the initiation of avalanches in a granular bed inclined at an angle above its angle of repose as a function of the initial packing fraction and slope angle in 3D. The results are in excellent quantitative agreement with the reported experimental data, and show the stabilization of the granular bed by a negative pore overpressure induced by the dilatancy of the bed and the spatiotemporal evolution of the packing fraction and shear deformation. The time evolution of these variables during the creeping phase before slope failure is scaled by a theoretical model accounting for darcian drag forces and the effect of dilatancy on the internal friction coefficient. We also analyzed the granular microstructure, which shows a gradual distortion of the contact network during creep at nearly a constant connectivity and the saturation of the anisotropy at failure. The runout of granular avalanches were investigated in 2D for two different configurations : 1) the collapse of a granular column under its own weight and 2) the runout of a granular pile as a result of kinetic energy supplied directly to the grains. We find power-law dependence of the resulting runout lengths and times with respect to the initial geometry or energy of the system. The time scales are shown to be consequence of two competing effects of the fluid on the grains : reducing relaxation times by viscous friction and lubricating the contacts between grains.; Les études présentées dans ce mémoire portent sur la simulation numérique et l'analyse physique des milieux granulaires immergés dans un fluide. Des développements numériques ont été réalisés pour coupler la méthode Lattice Boltzmann pour la dynamique du fluide avec la méthode Contact Dynamics en 2D et avec la méthode Molecular Dynamics en 3D pour la dynamique des grains. Ces outils numériques ont été utilisés pour étudier l'initiation des avalanches sur un plan incliné en fonction de la compacité initiale et de l'angle d'inclinaison en 3D. Les résultats sont en bon accord quantitatif avec les expériences et ont permis de mettre en évidence la stabilisation de la pente granulaire par une pression négative du fluide interstitielle induite par la dilatance, et l'évolution spatiotemporelle des grandeurs telles que la compacité et la déformation de cisaillement. Ces évolutions dans la phase de fluage qui précède la rupture de pente ont pu être mises à l'échelle par un modèle théorique incorporant la loi de Darcy et l'effet de la dilatance sur l'angle de frottement interne. L'analyse de la texture granulaire a révélé la distortion du réseau des contacts pendant le fluage et la saturation de l'anisotropie comme un critère de rupture. La propagation des avalanches granulaires a été étudiée dans une configuration 2D pour deux géométries différentes : 1) l'effondrement et l'étalement d'une colonne sous son propre poids, 2) l'étalement d'une pente sous l'effet d'une énergie cinétique injectée. Nous avons en particulier montré que la distance et la durée d'étalement obéissent à des lois de puissance en fonction du rapport d'aspect initial ou de l'énergie injectée. Le fluide exerce deux effets contradictoires : réduire les temps de relaxation et lubrifier les contacts. Ces effets ont été analysés dans le régime visqueux en fonction des conditions initiales et la viscosité du fluide.

Published
2013

41. Numerical modeling of immersed granular materials : initiation and propagation of avalanches in a fluid

Author

Mutabaruka, Patrick, Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires (PMMG), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier II - Sciences et Techniques du Languedoc, and DELENNE Jean-Yves(jean-yves.delenne@univ-montp2.fr)

Subjects
numerical simulations, [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, Lattice Boltzmann method, Immersed granular materials, matériaux granulaire immerge, Simulations numériques, méthode de Lattice Boltzmann
Abstract

By means of numerical simulations, we investigate the behavior of granular materials immersed in a fluid. Numerical developments were carried out to interface the Lattice Boltzmann Method for fluid dynamics with the Contact Dynamics method in 2D and with the Molecular Dynamics method in 3D for the simulation of the grains. Extensive simulations were applied to study the initiation of avalanches in a granular bed inclined at an angle above its angle of repose as a function of the initial packing fraction and slope angle in 3D. The results are in excellent quantitative agreement with the reported experimental data, and show the stabilization of the granular bed by a negative pore overpressure induced by the dilatancy of the bed and the spatiotemporal evolution of the packing fraction and shear deformation. The time evolution of these variables during the creeping phase before slope failure is scaled by a theoretical model accounting for darcian drag forces and the effect of dilatancy on the internal friction coefficient. We also analyzed the granular microstructure, which shows a gradual distortion of the contact network during creep at nearly a constant connectivity and the saturation of the anisotropy at failure. The runout of granular avalanches were investigated in 2D for two different configurations : 1) the collapse of a granular column under its own weight and 2) the runout of a granular pile as a result of kinetic energy supplied directly to the grains. We find power-law dependence of the resulting runout lengths and times with respect to the initial geometry or energy of the system. The time scales are shown to be consequence of two competing effects of the fluid on the grains : reducing relaxation times by viscous friction and lubricating the contacts between grains.; Les études présentées dans ce mémoire portent sur la simulation numérique et l'analyse physique des milieux granulaires immergés dans un fluide. Des développements numériques ont été réalisés pour coupler la méthode Lattice Boltzmann pour la dynamique du fluide avec la méthode Contact Dynamics en 2D et avec la méthode Molecular Dynamics en 3D pour la dynamique des grains. Ces outils numériques ont été utilisés pour étudier l'initiation des avalanches sur un plan incliné en fonction de la compacité initiale et de l'angle d'inclinaison en 3D. Les résultats sont en bon accord quantitatif avec les expériences et ont permis de mettre en évidence la stabilisation de la pente granulaire par une pression négative du fluide interstitielle induite par la dilatance, et l'évolution spatiotemporelle des grandeurs telles que la compacité et la déformation de cisaillement. Ces évolutions dans la phase de fluage qui précède la rupture de pente ont pu être mises à l'échelle par un modèle théorique incorporant la loi de Darcy et l'effet de la dilatance sur l'angle de frottement interne. L'analyse de la texture granulaire a révélé la distortion du réseau des contacts pendant le fluage et la saturation de l'anisotropie comme un critère de rupture. La propagation des avalanches granulaires a été étudiée dans une configuration 2D pour deux géométries différentes : 1) l'effondrement et l'étalement d'une colonne sous son propre poids, 2) l'étalement d'une pente sous l'effet d'une énergie cinétique injectée. Nous avons en particulier montré que la distance et la durée d'étalement obéissent à des lois de puissance en fonction du rapport d'aspect initial ou de l'énergie injectée. Le fluide exerce deux effets contradictoires : réduire les temps de relaxation et lubrifier les contacts. Ces effets ont été analysés dans le régime visqueux en fonction des conditions initiales et la viscosité du fluide.

Published
2013

42. Déclenchement des avalanches de grains immergés

Author

Mutabaruka, Patrick, Radjai, Farhang, Delenne, Jean-Yves, Physique et Mécanique des Milieux Granulaires (PMMG), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2013

43. Numerical modeling of the onset of immersed granular avalanches

Author

Mutabaruka, Patrick, Delenne, Jean-Yves, Radjai, Farhang, Soga, Kenichi, Multiscale Material Science for Energy and Environment (MSE 2), Massachusetts Institute of Technology (MIT), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires (PMMG), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Engineering Department, University of Cambridge [UK] (CAM), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Multiscale Materials Science for Energy and Environment ( MSE2 ), Massachusetts Institute of Technology ( MIT ) -Centre National de la Recherche Scientifique ( CNRS ), Ingénierie des Agro-polymères et Technologies Émergentes ( IATE ), Centre de Coopération Internationale en Recherche Agronomique pour le Développement ( CIRAD ) -Université de Montpellier ( UM ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Institut national d’études supérieures agronomiques de Montpellier ( Montpellier SupAgro ) -Institut National de la Recherche Agronomique ( INRA ) -Centre international d'études supérieures en sciences agronomiques ( Montpellier SupAgro ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Granulaires ( PMMG ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), University of Cambridge [UK] ( CAM ), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
[ SDV ] Life Sciences [q-bio], [SDV]Life Sciences [q-bio]
Abstract

A dense granular bed immersed in a viscous fluid and inclined above its angle of repose is stabilized by a tensile overpressure induced by the slow creep and expansion of the bed due to dialatncy. We analyze this transient creep flow and onset of slope failure as a function of the initial packing fraction and for different slope angles by means of 3D coupled molecular dynamics/Lattice Boltzmann simulations. Our data are in excellent agreement with the experimental results reported by Pailha et al. [1]. We find a parabolic increase of the overpressure with depth, as correctly predicted from the Darcy law and dilation rate, and show that the failure is triggered at the free surface and propagates consequently to the bottom of the bed. The mean triggering time scales with a characteristic time depending on the fluid viscosity and slope angle, and it increases nonlinearly with the initial packing fraction. We also derive the time evolution of the packing fraction that nicely fits the simulation data. Interestingly, the packing fraction at failure decreases only slightly as the initial packing fraction is reduced but remains always above the critical packing fraction, which is reached well after the failure during steady flow on the inclined plane. As in experiments, the cumulative shear strain at failure varies quite weakly with the initial packing fraction. A detailed analysis of the evolution of the granular texture during creep suggests that the pile expands for a nearly constant number of contacts. This leads to the rotation of the mean contact direction, accompanied by an increase of contact anisotropy and a decrease of force anisotropy. The rotation drives the system, increasingly fragilized by the increase of porosity, from a Mohr--‐Coulomb behavior to a fluid--‐like state. The difference between the principal stress directions with respect to the flow direction explains correctly the fact that the instability occurs for a nearly constant value of the cumulative shear strain with a weak dependence on the initial packing fraction and slope angle.

Published
2013

44. Trigger mechanisms of underwater avalanches

Author

Mutabaruka, Patrick, Delenne, Jean-Yves, Radjai, Farhang, Soga, Kenichi, Physique et Mécanique des Milieux Granulaires (PMMG), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires ( PMMG ), Laboratoire de Mécanique et Génie Civil ( LMGC ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
Published
2012

45. Etude du comportement d'un mélange fluide-grains

Author

Mutabaruka, Patrick, Delenne, Jean-Yves, Radjai, Farhang, Soga, Kenichi, Physique et Mécanique des Milieux Granulaires (PMMG), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Engineering Department, University of Cambridge [UK] (CAM), and Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2012

46. Numerical modeling of underwater avalanches

Author

Mutabaruka, Patrick, Delenne, Jean-Yves, Radjai, Farhang, Soga, Kenichi, Physique et Mécanique des Milieux Granulaires (PMMG), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2011

47. Numerical modeling of submarine avalanches

Author

Mutabaruka , Patrick, Delenne , Jean-Yves, Radjai , Farhang, Soga , Kenichi, Physique et Mécanique des Milieux Granulaires ( PMMG ), Laboratoire de Mécanique et Génie Civil ( LMGC ), Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ), Physique et Mécanique des Milieux Granulaires (PMMG), Laboratoire de Mécanique et Génie Civil (LMGC), and Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
Published
2011

48. Modélisation numérique des matériaux granulaires immergés : application aux avalanches sous-marines

Author

Mutabaruka, Patrick, Delenne, Jean-Yves, Radjai, Farhang, Soga, Kenichi, Physique et Mécanique des Milieux Granulaires (PMMG), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires ( PMMG ), Laboratoire de Mécanique et Génie Civil ( LMGC ), and Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Montpellier ( UM ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ PHYS.MECA.MEMA ] Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [ SPI.MECA.MEMA ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
Published
2011

49. Simulation des avalanches sous-marines

Author

Mutabaruka, Patrick, Delenne, Jean-Yves, Radjai, Farhang, Physique et Mécanique des Milieux Granulaires (PMMG), Laboratoire de Mécanique et Génie Civil (LMGC), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physique et Mécanique des Milieux Granulaires, Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA), and Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut National de la Recherche Agronomique (INRA)

Subjects
[PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2011

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