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133 results on '"Houzeaux, Guillaume"'

1. Alya towards Exascale: Optimal OpenACC Performance of the Navier-Stokes Finite Element Assembly on GPUs

Author

Owen, Herbert, Ernst, Dominik, Gruber, Thomas, Lemkuhl, Oriol, Houzeaux, Guillaume, Gasparino, Lucas, and Wellein, Gerhard

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing, Computer Science - Performance
Abstract

This paper addresses the challenge of providing portable and highly efficient code structures for CPU and GPU architectures. We choose the assembly of the right-hand term in the incompressible flow module of the High-Performance Computational Mechanics code Alya, which is one of the two CFD codes in the Unified European Benchmark Suite. Starting from an efficient CPU-code and a related OpenACC-port for GPUs we successively investigate performance potentials arising from code specialization, algorithmic restructuring and low-level optimizations. We demonstrate that only the combination of these different dimensions of runtime optimization unveils the full performance potential on the GPU and CPU. Roofline-based performance modelling is applied in this process and we demonstrate the need to investigate new optimization strategies if a classical roofline limit such as memory bandwidth utilization is achieved, rather than stopping the process. The final unified OpenACC-based implementation boosts performance by more than 50x on an NVIDIA A100 GPU (achieving approximately 2.5 TF/s FP64) and a further factor of 5x for an Intel Icelake based CPU-node (achieving approximately 1.0 TF/s FP64). The insights gained in our manual approach lays ground implementing unified but still highly efficient code structures for related kernels in Alya and other applications. These can be realized by manual coding or automatic code generation frameworks.

Published
2024

2. A portable coding strategy to exploit vectorization on combustion simulations

Author

Banchelli, Fabio, Oyarzun, Guillermo, Garcia-Gasulla, Marta, Mantovani, Filippo, Both, Ambrus, Houzeaux, Guillaume, and Mira, Daniel

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing, Computer Science - Performance, Physics - Applied Physics
Abstract

The complexity of combustion simulations demands the latest high-performance computing tools to accelerate its time-to-solution results. A current trend on HPC systems is the utilization of CPUs with SIMD or vector extensions to exploit data parallelism. Our work proposes a strategy to improve the automatic vectorization of finite element-based scientific codes. The approach applies a parametric configuration to the data structures to help the compiler detect the block of codes that can take advantage of vector computation while maintaining the code portable. A detailed analysis of the computational impact of this methodology on the different stages of a CFD solver is studied on the PRECCINSTA burner simulation. Our parametric implementation has proven to help the compiler generate more vector instructions in the assembly operation: this results in a reduction of up to 9.3 times of the total executed instruction maintaining constant the Instructions Per Cycle and the CPU frequency. The proposed strategy improves the performance of the CFD case under study up to 4.67 times on the MareNostrum 4 supercomputer.

Published
2022

3. Dynamic load balance of chemical source term evaluation in high-fidelity combustion simulations

Author

Ramírez-Miranda, Guillem, Mira, Daniel, Pérez-Sánchez, Eduardo J., Surapaneni, Anurag, Borrell, Ricard, Houzeaux, Guillaume, and García-Gasulla, Marta

Subjects
Physics - Fluid Dynamics
Abstract

This paper presents a load balancing strategy for reaction rate evaluation and chemistry integration in reacting flow simulations. The large disparity in scales during combustion introduces stiffness in the numerical integration of the PDEs and generates load imbalance during the parallel execution. The strategy is based on the use of the DLB library to redistribute the computing resources at node level, lending additional CPU-cores to higher loaded MPI processes. This approach does not require explicit data transfer and is activated automatically at runtime. Two chemistry descriptions, detailed and reduced, are evaluated on two different configurations: laminar counterflow flame and a turbulent swirl-stabilized flame. For single-node calculations, speedups of 2.3x and 7x are obtained for the detailed and reduced chemistry, respectively. Results on multi-node runs also show that DLB improves the performance of the pure-MPI code similar to single node runs. It is shown DLB can get performance improvements in both detailed and reduced chemistry calculations., Comment: 32 pages, 18 figures, Submitted to Computer & Fluids

Published
2022

4. Forest density is more effective than tree rigidity at reducing the onshore energy flux of tsunamis: Evidence from Large Eddy Simulations with Fluid-Structure Interactions

Author

Mukherjee, Abhishek, Cajas, Juan Carlos, Houzeaux, Guillaume, Lehmkuhl, Oriol, Suckale, Jenny, and Marras, Simone

Subjects
Physics - Fluid Dynamics, Physics - Computational Physics
Abstract

Communities around the world are increasingly interested in nature-based solutions to mitigation of coastal risks like coastal forests, but it remains unclear how much protective benefits vegetation provides, particularly in the limit of highly energetic flows after tsunami impact. The current study, using a three-dimensional incompressible computational fluid dynamics model with a fluid-structure interaction approach, aims to quantify how energy reflection and dissipation vary with different degrees of rigidity and vegetation density of a coastal forest. We represent tree trunks as cylinders and use the elastic modulus of hardwood trees such as pine or oak to characterize the rigidity of these cylinders. The numerical results show that energy reflection increases with rigidity only for a single cylinder. In the presence of multiple cylinders, the difference in energy reflection created by varying rigidity diminishes as the number of cylinders increases. Instead of rigidity, we find that the blockage area created by the presence of multiple tree trunks dominates energy reflection. As tree trunks are deformed by the hydrodynamic forces, they alter the flow field around them, causing turbulent kinetic energy generation in the wake region. As a consequence, trees dissipate flow energy, highlighting coastal forests reducing the onshore energy flux of tsunamis by means of both reflection and dissipation.

Published
2022

5. Performance assessment of CUDA and OpenACC in large scale combustion simulations

Author

Oyarzun, Guillermo, Mira, Daniel, and Houzeaux, Guillaume

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing
Abstract

GPUs have climbed up to the top of supercomputer systems making life harder to many legacy scientific codes. Nowadays, many recipes are being used in such code's portability, without any clarity of which is the best option. We present a comparative analysis of the two most common approaches, CUDA and OpenACC, into the multi-physics CFD code Alya. Our focus is the combustion problems which are one of the most computing demanding CFD simulations. The most computing-intensive parts of the code were analyzed in detail. New data structures for the matrix assembly step have been created to facilitate a SIMD execution that benefits vectorization in the CPU and stream processing in the GPU. As a result, the CPU code has improved its performance by up to 25%. In GPU execution, CUDA has proven to be up to 2 times faster than OpenACC for the assembly of the matrix. On the contrary, similar performance has been obtained in the kernels related to vector operations used in the linear solver, where there is minimal memory reuse.

Published
2021

7. Parallel SFC-based mesh partitioning and load balancing

Author

Borrell, Ricard, Oyarzun, Guillermo, Dosimont, Damien, and Houzeaux, Guillaume

Subjects
Physics - Computational Physics
Abstract

Modern supercomputers allow the simulation of complex phenomena with increased accuracy. Eventually, this requires finer geometric discretizations with larger numbers of mesh elements. In this context, and extrapolating to the Exascale paradigm, meshing operations such as generation, adaptation or partition, become a critical bottleneck within the simulation workflow. In this paper, we focus on mesh partitioning. In particular, we present some improvements carried out on an in-house parallel mesh partitioner based on the Hilbert Space-Filling Curve. Additionally, taking advantage of its performance, we present the application of the SFC-based partitioning for dynamic load balancing. This method is based on the direct monitoring of the imbalance at runtime and the subsequent re-partitioning of the mesh. The target weights for the optimized partitions are evaluated using a least-squares approximation considering all measurements from previous iterations. In this way, the final partition corresponds to the average performance of the computing devices engaged., Comment: 10 pages, 9 figures. arXiv admin note: text overlap with arXiv:2005.05899

Published
2020

8. The EU Center of Excellence for Exascale in Solid Earth (ChEESE): Implementation, results, and roadmap for the second phase

Author

Folch, Arnau, Abril, Claudia, Afanasiev, Michael, Amati, Giorgio, Bader, Michael, Badia, Rosa M., Bayraktar, Hafize B., Barsotti, Sara, Basili, Roberto, Bernardi, Fabrizio, Boehm, Christian, Brizuela, Beatriz, Brogi, Federico, Cabrera, Eduardo, Casarotti, Emanuele, Castro, Manuel J., Cerminara, Matteo, Cirella, Antonella, Cheptsov, Alexey, Conejero, Javier, Costa, Antonio, de la Asunción, Marc, de la Puente, Josep, Djuric, Marco, Dorozhinskii, Ravil, Espinosa, Gabriela, Esposti-Ongaro, Tomaso, Farnós, Joan, Favretto-Cristini, Nathalie, Fichtner, Andreas, Fournier, Alexandre, Gabriel, Alice-Agnes, Gallard, Jean-Matthieu, Gibbons, Steven J., Glimsdal, Sylfest, González-Vida, José Manuel, Gracia, Jose, Gregorio, Rose, Gutierrez, Natalia, Halldorsson, Benedikt, Hamitou, Okba, Houzeaux, Guillaume, Jaure, Stephan, Kessar, Mouloud, Krenz, Lukas, Krischer, Lion, Laforet, Soline, Lanucara, Piero, Li, Bo, Lorenzino, Maria Concetta, Lorito, Stefano, Løvholt, Finn, Macedonio, Giovanni, Macías, Jorge, Marín, Guillermo, Martínez Montesinos, Beatriz, Mingari, Leonardo, Moguilny, Geneviève, Montellier, Vadim, Monterrubio-Velasco, Marisol, Moulard, Georges Emmanuel, Nagaso, Masaru, Nazaria, Massimo, Niethammer, Christoph, Pardini, Federica, Pienkowska, Marta, Pizzimenti, Luca, Poiata, Natalia, Rannabauer, Leonhard, Rojas, Otilio, Rodriguez, Juan Esteban, Romano, Fabrizio, Rudyy, Oleksandr, Ruggiero, Vittorio, Samfass, Philipp, Sánchez-Linares, Carlos, Sanchez, Sabrina, Sandri, Laura, Scala, Antonio, Schaeffer, Nathanael, Schuchart, Joseph, Selva, Jacopo, Sergeant, Amadine, Stallone, Angela, Taroni, Matteo, Thrastarson, Solvi, Titos, Manuel, Tonelllo, Nadia, Tonini, Roberto, Ulrich, Thomas, Vilotte, Jean-Pierre, Vöge, Malte, Volpe, Manuela, Aniko Wirp, Sara, and Wössner, Uwe

Published
2023
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11. MPI+X: task-based parallelization and dynamic load balance of finite element assembly

Author

Garcia-Gasulla, Marta, Houzeaux, Guillaume, Ferrer, Roger, Artigues, Antoni, López, Victor, Labarta, Jesús, and Vázquez, Mariano

Subjects
Computer Science - Mathematical Software, Computer Science - Distributed, Parallel, and Cluster Computing, Computer Science - Performance, Computer Science - Programming Languages
Abstract

The main computing tasks of a finite element code(FE) for solving partial differential equations (PDE's) are the algebraic system assembly and the iterative solver. This work focuses on the first task, in the context of a hybrid MPI+X paradigm. Although we will describe algorithms in the FE context, a similar strategy can be straightforwardly applied to other discretization methods, like the finite volume method. The matrix assembly consists of a loop over the elements of the MPI partition to compute element matrices and right-hand sides and their assemblies in the local system to each MPI partition. In a MPI+X hybrid parallelism context, X has consisted traditionally of loop parallelism using OpenMP. Several strategies have been proposed in the literature to implement this loop parallelism, like coloring or substructuring techniques to circumvent the race condition that appears when assembling the element system into the local system. The main drawback of the first technique is the decrease of the IPC due to bad spatial locality. The second technique avoids this issue but requires extensive changes in the implementation, which can be cumbersome when several element loops should be treated. We propose an alternative, based on the task parallelism of the element loop using some extensions to the OpenMP programming model. The taskification of the assembly solves both aforementioned problems. In addition, dynamic load balance will be applied using the DLB library, especially efficient in the presence of hybrid meshes, where the relative costs of the different elements is impossible to estimate a priori. This paper presents the proposed methodology, its implementation and its validation through the solution of large computational mechanics problems up to 16k cores.

Published
2018
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14. Dynamics of airflow in a short inhalation

Author

Bates, Alister, Doorly, Denis, Cetto, Raul, Calmet, Hadrien, Gambaruto, Alberto, Tolley, Neil, Houzeaux, Guillaume, and Schroter, Robert

Subjects
Physics - Fluid Dynamics
Abstract

During a rapid inhalation, such as a sniff, the flow in the airways accelerates and decays quickly. The consequences for flow development and convective trans- port of an inhaled gas were investigated in a subject geometry extending from the nose to the bronchi. The progress of flow transition and the advance of an inhaled non-absorbed gas were determined using highly resolved simulations of a sniff 0.5 s long, 1 litre per second peak flow, 364 ml inhaled volume. In the nose, the distribution of airflow evolved through three phases: (i) an initial transient of about 50 ms, roughly the filling time for a nasal volume, (ii) quasi-equilibrium over the majority of the inhalation, and (iii) a terminating phase. Flow transition commenced in the supraglottic region within 20ms, resulting in large- amplitude fluctuations persisting throughout the inhalation; in the nose, fluctuations that arose nearer peak flow were of much reduced intensity and diminished in the flow decay phase. Measures of gas concentration showed non-uniform build-up and wash-out of the inhaled gas in the nose. At the carina, the form of the temporal concentration profile reflected both shear dispersion and airway filling defects owing to recirculation regions., Comment: 15 pages

Published
2015
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16. Alya: Towards Exascale for Engineering Simulation Codes

Author

Vazquez, Mariano, Houzeaux, Guillaume, Koric, Seid, Artigues, Antoni, Aguado-Sierra, Jazmin, Aris, Ruth, Mira, Daniel, Calmet, Hadrien, Cucchietti, Fernando, Owen, Herbert, Taha, Ahmed, and Cela, Jose Maria

Subjects
Physics - Computational Physics
Abstract

Alya is the BSC in-house HPC-based multi-physics simulation code. It is designed from scratch to run efficiently in parallel supercomputers, solving coupled problems. The target domain is engineering, with all its particular features: complex geome- tries and unstructured meshes, coupled multi-physics with exotic coupling schemes and Physical models, ill-posed problems, flexibility needs for rapidly including new models, etc. Since its conception in 2004, Alya has shown scaling behaviour in an increasing number of cores. In this paper, we present its performance up to 100.000 cores in Blue Waters, the NCSA supercomputer. The selected tests are representative of the engineering world, all the problematic features included: incompressible flow in a hu- man respiratory system, low Mach combustion problem in a kiln furnace and coupled electro-mechanical problem in a heart. We show scalability plots for all cases, discussing all the aspects of such kind of simulations, including solvers convergence., Comment: Preprint. Paper submitted to International Supercomputing Conference 2014. Waiting for approval

Published
2014

19. Ventricular anatomical complexity and sex differences impact predictions from electrophysiological computational models

Author

Gonzalez-Martin, Pablo, primary, Sacco, Federica, additional, Butakoff, Constantine, additional, Doste, Ruben, additional, Bederian, Carlos, additional, Gutierrez Espinosa de los Monteros, Lilian K., additional, Houzeaux, Guillaume, additional, Iaizzo, Paul A., additional, Iles, Tinen L., additional, Vazquez, Mariano, additional, and Aguado-Sierra, Jazmin, additional

Published
2023
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25. Ventricular anatomical complexity and sex differences impact predictions from electrophysiological computational models

Author

Gonzalez Martin, Pablo, Sacco, Federica, Butakoff, Constantine, Doste, Ruben, Bederian, Carlos, Houzeaux, Guillaume, Vázquez, Mariano, Aguado Sierra, Jazmín, and Barcelona Supercomputing Center

Subjects
Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria [Àrees temàtiques de la UPC], Computational cardiac models, Simulació per ordinador, Ventricle, sex-specific cardiac pathophysiology, Personalized medicine, Imaging
Abstract

The aim of this work was to analyze the influence of sex hormones and anatomical details (trabeculations and false tendons) on the electrophysiology of healthy human hearts. Additionally, sex- and anatomy-dependent effects of ventricular tachycardia (VT) inducibility are presented. To this end, four anatomically normal, human, biventricular geometries (two male, two female), with identifiable trabeculations, were obtained from high-resolution, ex-vivo MRI and represented by detailed and smoothed geometrical models (with and without the trabeculations). Additionally one model was augmented by a scar. The electrophysiology finite element model (FEM) simulations were carried out, using O’Hara-Rudy human myocyte model with sex phenotypes of Yang and Clancy. A systematic comparison between detailed vs smooth anatomies, male vs female normal hearts was carried out. The heart with a myocardial infarction was subjected to a programmed stimulus protocol to identify the effects of sex and anatomical detail on ventricular tachycardia inducibility. All female hearts presented QT-interval prolongation however the prolongation interval in comparison to the male phenotypes was anatomy-dependent and was not correlated to the size of the heart. Detailed geometries showed QRS fractionation and increased T-wave magnitude in comparison to the corresponding smoothed geometries. A variety of sustained VTs were obtained in the detailed and smoothed male geometries at different pacing locations, which provide evidence of the geometry-dependent differences regarding the prediction of the locations of reentry channels. In the female phenotype, sustained VTs were induced in both detailed and smooth geometries with RV apex pacing, however no consistent reentry channels were identified. Anatomical and physiological cardiac features play an important role defining risk in cardiac disease. These are often excluded from cardiac electrophysiology simulations. The assumption that the cardiac endocardium is smooth may produce inaccurate predictions towards the location of reentry channels in in-silico tachycardia inducibility studies JA-S, FS, GH and MV are supported by the European Union’s Horizon 2020 research and innovation programme under grant agreements No 675451 (Compbiomed project phase 1) and No 823712 (CompBioMed project, phase 2) and project No 777204 (SilicoFCM project). Part of the simulation computing hours were provided by the CompBioMed project phase 1. JA-S was awarded computation time from Red Espanola de Supercomputacion (RES). (Activity IDs: FI-2018-2-0049 and BCV-2019-2-0014) JA-S is funded by a Ramon y Cajal fellowship (RYC-2017-22532), Ministerio de Ciencia e Innovacion, Spain; and by Plan Estatal de Investigacion Cientifica y Tecnica y de Innovacion 2017-2020 from the Ministerio de Ciencia e Innovacion y Universidades (PID2019-104356RBC41/AEI/10.13039/501100011033): meHeart ME PID2019-104356RB-C44. CB is funded by the Torres Quevedo Program (PTQ2018-010290), Ministerio de Ciencia e Innovacion, Spain. MV, GH and CB are funded by the Spanish Neotec project EXP - 00123159/SNEO-20191113 Generador de corazones virtuales. LKGM was funded by Fundacion Carolina-BBVA. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. There was no additional external funding received for this study. Peer Reviewed "Article signat per 11 autors/es: Pablo Gonzalez-Martin,Federica Sacco,Constantine Butakoff,Ruben Doste,Carlos Bederian,Lilian K. Gutierrez Espinosa de los Monteros,Guillaume Houzeaux,Paul A. Iaizzo,Tinen L. Iles,Mariano Vazquez,Jazmin Aguado-Sierra"

Published
2023

28. ETP4HPC’s SRA 5 strategic research agenda for High-Performance Computing in Europe 2022: European HPC research priorities 2023-2027

Author

Carpenter, Paul Matthew, Casas Guix, Marc, Unsal, Osman Sabri, Radojkovic, Petar, Martorell Bofill, Xavier, Miranda, Alberto, Guitart Fernández, Jordi, Corbalán González, Julita, Peña Monferrer, Antonio José, Bautista Gomez, Leonardo Arturo, Vázquez García, Miguel, Beltran Querol, Vicenç, Queralt Calafat, Anna, Nou Castell, Ramon, Borrell Pol, Ricard, Houzeaux, Guillaume, Serradell Maronda, Kim, Carrera Pérez, David, García Sáez, Artur, Puchol García, Carlos, Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors, Universitat Politècnica de Catalunya. Departament d'Enginyeria de Serveis i Sistemes d'Informació, Barcelona Supercomputing Center, Universitat Politècnica de Catalunya. CROMAI - Computing Resources Orchestration and Management for AI, and Universitat Politècnica de Catalunya. inSSIDE - integrated Software, Services, Information and Data Engineering

Subjects
Europe, Supercomputadors, High performance computing, Supercomputers, Europa, Informàtica::Arquitectura de computadors [Àrees temàtiques de la UPC], Càlcul intensiu (Informàtica)
Abstract

This document feeds research and development priorities devel-oped by the European HPC ecosystem into EuroHPC’s Research and Innovation Advisory Group with an aim to define the HPC Technology research Work Programme and the calls for proposals included in it and to be launched from 2023 to 2026. This SRA also describes the major trends in the deployment of HPC and HPDA methods and systems, driven by economic and societal needs in Europe, taking into account the changes ex-pected in the technologies and architectures of the expanding underlying IT infrastructure. The goal is to draw a complete picture of the state of the art and the challenges for the next three to four years rather than to focus on specific technologies, implementations or solutions. Peer Reviewed Article signat per 140 autors/autores: Estela Suarez,JSC; Nico Mittenzwey, MEGWARE; Laurent Cargemel, Atos; Alessandro Russo, Leonardo; Andy Forrester, HypeAccelerator Solutions Limited; Carlo Cavazzoni, Leonardo; Craig Prunty, SiPearl; Daniele Cesarini, Cineca; David Tur, Do IT Now; Fabrizio Magugliani, E4 Computer Engineering SpA; Marc Casas, BSC; Rene Oertel, MEGWARE Computer Vertrieb und Service GmbH; Sergio Sánchez, Vicomtech; Thierry Porcher, Do IT Now; Marc Duranton, CEA / HiPEAC; Sakir Sezer, NVIDIA; Craig Prunty, SIPEARL; Alessandro Russo, Leonardo; Dirk Pleiter, KTH; Luigi Capone, Leonardo; Marco Cicala, E4 Computer Engineering SpA; Osman Unsal, BSC; Paolo Amato, Micron; Petar Radojkovic, BSC; Rod Evans, NVIDIA; Thierry Porcher, Do IT Now; Xavier Martorell, BSC; Manolis Marazakis, FORTH; Maria Perez, UPM / BDVA; Pascale Rossé-Laurent, Atos; Alberto Miranda, BSC; Alberto Scionti, LINKS Foundation; Alessandro Russo, Leonardo; David Tur, Do IT Now; Denis Maggi, Vicomtech; Georgios Goumas, ICCS; Ina Schmitz, ParTec; Jordi Guitart, BSC; Julita Corbalan, BSC; Michele Martone, LRZ; Nico Mittenzwey, MEGWARE; Nicolo Magini, Leonardo; Paolo Viviani, LINKS Foundation; Rene Oertel, MEGWARE Computer Vertrieb und Service GmbH; Sebastien Varrette, University of Luxembourg; Thierry Porcher, Do IT Now; Thomas Moschny, Par-Tec, Guy Lonsdale, SCAPOS; Paul Carpenter, BSC; Gabriel Antoniu, INRIA (BDVA); Alexander Costan, INSA Rennes/Inria; Ani Anciaux Sedrakian, IFPEN; Antonio Peña, BSC; Antonio Sciarappa, Leonardo; Christian Perez, INRIA; Francesco Iannone, ENEA; Jose Gracia, HLRS; Leonardo Arturo Bautista Gomez, BSC; Luigi Capone, Leonardo; Miguel Vasquez, BSC; Olivier Marsden, ECMWF; Paolo Viviani, LINKS Foundation; Patrick Carribault, CEA; Sebastien Varrette, University of Luxembourg; Vicenc Beltran, BSC; Xavier Martorell, BSC; Andre Brinkmann, JGU – Mainz; Sai Narasimhamurthy, Seagate; Anna Queralt, BSC; Jean-Thomas Acquaviva, DDN Storage; Jesús Carretero Pérez, UC3M; Nicolo Magini, Leonardo Labs; Paolo Amato, Micron; Philippe Deniel, CEA; Ramon Nou, BSC; Tiago Quintino, ECMWF; Dirk Pleiter, KTH; Utz-Uwe Haus, HPE; Adrian Tate, NAG; Ani Anciaux Sedrakian, IFPEN; Antonio Sciarappa, Leonardo Labs; Chiara Vercellino, LINKS Foundation; Dario Garcia-Gasulla, BSC; Giovanni Samaey, KU Leuven; Luigi Capone, Leonardo; Marcin Chrust, ECMWF; Maximilian Behr, Northern Data AG, Olivier Beaumont, INRIA; Ricard Borrell, BSC; Ulrich Ruede, CERFACS/FAU; Ward Melis, KU Leuven; Erwin Laure, MPCDF; Andreas Wierse, SICOS; Bruno Raffin, INRIA; Carlo Cavazzoni, Leonardo; Guillaume Houzeaux, BSC; Ioan Hadade, ECMWF; Kim Serradell Maronda, BSC; Luigi Capone, Leonardo; Miguel Vasquez, BSC; Ricard Borrell, BSC; Sabri Pllana; Sinead Ryan, Trinity College Dublin; Vicence Beltran, BSC; Hans-Christian Hoppe, ParTec; Jens Krueger, FRAUNHOFER; Alberto Scionti, LINKS Foundation; Ander Garcia, Vicomtech; Anna Queralt, BSC; Benjamin Depardon, UCit; Craig Prunty, SIPEARL; Daniela Ghezzim, Leonardo S.p.a.; Daniele Piccarozzi, Arm; David Carrera, BSC; Philippe Bricard, UCit; Thierry Goubier, CEA; Venkatesh Kannan, ICHEC; Valeria Bartsch, FRAUNHOFER; Cyril Allouche, Atos; Kristel Michelsen, JSC; Andrea Scarabosio, Links Foundation; Artur Garcia, BSC; Chayma Bouazza, PASQAL; Daniele Dragoni, Leonardo; Daniele Gregori, E4 Computer Engineering SpA; Daniele Ottaviani, Cineca; David Bowden, Dell Technologies; David Tur, Do IT Now; Dennis Hoppe, High-Performance Computing Center Stuttgart; Fabrizio Magugliani,E4 Computer Engineering SpA; Filippo Palombi, ENEA; Giacomo Vitali, LINKS Foundation; Guillaume Colin de Verdière, CEA; Jean-Philippe Nominé, CEA; Leonardo Arturo Bautista Gomez, BSC; Mikael Johansson, CSC; Olivier Terzo, LINKS Foundation; Osman Unsal, BSC; Vekatesh KannanI, CHEC; Erwin Laure, MPCDF; Andreas Wierse, SICOS; Bruno Raffin, INRIA; Carlo Cavazzoni, Leonardo; Guillaume Houzeaux, BSC; Ioan Hadade, ECMWF; Kim Serradell Maronda, BSC; Luigi Capone, Leonardo; Miguel Vasquez, BSC; Ricard Borrell, BSC; Sabri Pllana Sinead Ryan, Trinity College Dublin; Vicence Beltran, BSC; Hans-Christian Hoppe, ParTec; Jens Krueger, FRAUNHOFER; Alberto Scionti, LINKS Foundation; Ander Garcia, Vicomtech; Anna Queralt, BSC; Benjamin Depardon, UCit; Craig Prunty, SIPEARL; Daniela Ghezzi, Leonardo S.p.a.; Daniele Piccarozzi, Arm; David Carrera, BSC; Philippe Bricard, UCit; Thierry Goubier, CEA; Venkatesh Kannan, ICHEC; Valeria Bartsch, FRAUNHOFER; Cyril Allouche, Atos; Kristel Michelsen, JSC; Andrea Scarabosio, Links Foundation; Artur Garcia, BSC; Chayma Bouazza, PASQAL; Daniele Dragoni, Leonardo Daniele Gregori, E4 Computer Engineering SpA; Daniele Ottaviani, Cineca; David Bowden, Dell Technologies; David Tur, Do IT Now; Dennis Hoppe, High-Performance Computing Center Stuttgart; Fabrizio Magugliani, E4 Computer Engineering SpA; Filippo Palombi, ENEA; Giacomo Vitali, LINKS Foundation; Guillaume Colin de Verdière, CEA; Jean-Philippe Nominé, CEA Leonardo; Arturo Bautista Gomez, BSC, Mikael Johansson, CSC; Olivier Terzo, LINKS Foundation; Osman Unsal, BSC; Vekatesh KannanI; Utz-Uwe Haus (HPE); Sai Narasimhamurthy (Seagate); Maria S. Perez (UPM); Dirk Pleiter (KTH); Andreas Wierse (SICOS); Paul Carpenter (BSC); Utz-Uwe Haus (HPE); Erwin Laure (MPCDF); Sai Narasimhamurthy (Seagate Systems); Estela Suarez (Forschungszentrum Jülich); Manolis Marazakis (FORTH); Marc Duranton (CEA); Dirk Pleiter (KTH); Giuliano Taffoni (INAF); Hans-Christian Hoppe (Scapos AG); Gabriel Antoniu (Inria); Patrick Valduriez (Inria); Hans-Christian Hoppe (SCAPOS); Jens Krüger (Fraunhofer ITWM); Andreas Wierse (Sicos BW); François Bodin (Inria); Sagar Dolas (SURF); Damien Gratadour (Université Paris Diderot); Michael Malms (ETP4HPC); Leonieke Mevus (SURF); Pascale Rossé-Laurent (Atos); Jean-Robert Bacou (Atos); Carlos Puchol (BSC); Kristel Michielsen (JSC); Tiina Leiponen (CSC); Carlo Cavazzoni (Leonardo), Ivan Spisso (Leonardo); Maike Gilliot (ETP4HPC); Hans-Christian Hoppe (Scapos); Guy Lonsdale (ETP4HPC Steering Board / Fraunhofer / Scapos / FocusCoE); Fabrizio Magugliani (ETP4HPC Steering Board / E4 Computer Engineering); Jean-Philippe Nominé (ETP4HPC Steering Board / CEA); Andreas Wierse (SICOS); Pascal Bouvry (University of Luxembourg); Daniela Posch (SICOS); Gilles Civario (Intel); Henri Calandra (TotalEnergies & PRACE IAC); Vincent Galinier (Airbus & PRACE IAC); Xavier Vigouroux (Atos); Alban Rousset (LuxProvide); Michael Schlottke-Lakemper (HLRS); Carolina Berucci (Leonardo), Erwin Laure, Carolina Berucci (Leonardo)

Published
2022

29. Validation of tsunami numerical simulation models for an idealized coastal industrial site

Author

Watanabe, Masashi, primary, Arikawa, Taro, additional, Kihara, Naoto, additional, Tsurudome, Chiaki, additional, Hosaka, Koichi, additional, Kimura, Tatsuto, additional, Hashimoto, Takayuki, additional, Ishihara, Fumitaka, additional, Shikata, Takemi, additional, Morikawa, Daniel Shigueo, additional, Makino, Taiga, additional, Asai, Mitsuteru, additional, Chida, Yu, additional, Ohnishi, Yoichi, additional, Marras, Simone, additional, Mukherjee, Abhishek, additional, Cajas, Juan Carlos, additional, Houzeaux, Guillaume, additional, Paolo, B D, additional, Lara, Javier L., additional, Barajas, Gabriel, additional, Losada, Íñigo J., additional, Hasebe, Masanobu, additional, Shigihara, Yoshinori, additional, Asai, Tatsuya, additional, Ikeya, Tsuyoshi, additional, Inoue, Shusaku, additional, Matsutomi, Hideo, additional, Nakano, Yoshiaki, additional, Okuda, Yasuo, additional, Okuno, Shunya, additional, Ooie, Takayuki, additional, Shoji, Gaku, additional, and Tateno, Tomokazu, additional

Published
2022
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32. HPC-enabling technologies for high-fidelity combustion simulations

Author

Mira, Daniel, Pérez-Sánchez, Eduardo J., Borrell, Ricard, Houzeaux, Guillaume, and Barcelona Supercomputing Center

Subjects
Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria [Àrees temàtiques de la UPC], Chemistry, Exascale, High-order methods, Graphics Processing Unit (GPU), Mechanical Engineering, General Chemical Engineering, Simulació per ordinador, Combustion, Physical and Theoretical Chemistry, Multiphase flow, Supercomputers, High-Performance Computing (HPC)
Abstract

With the increase in computational power in the last decade and the forthcoming Exascale supercomputers, a new horizon in computational modelling and simulation is envisioned in combustion science. Considering the multiscale and multiphysics characteristics of turbulent reacting flows, combustion simulations are considered as one of the most computationally demanding applications running on cutting-edge supercomputers. Exascale computing opens new frontiers for the simulation of combustion systems as more realistic conditions can be achieved with high-fidelity methods. However, an efficient use of these computing architectures requires methodologies that can exploit all levels of parallelism. The efficient utilization of the next generation of supercomputers needs to be considered from a global perspective, that is, involving physical modelling and numerical methods with methodologies based on High-Performance Computing (HPC) and hardware architectures. This review introduces recent developments in numerical methods for large-eddy simulations (LES) and direct-numerical simulations (DNS) to simulate combustion systems, with focus on the computational performance and algorithmic capabilities. Due to the broad scope, a first section is devoted to describe the fundamentals of turbulent combustion, which is followed by a general description of state-of-the-art computational strategies for solving these problems. These applications require advanced HPC approaches to exploit modern supercomputers, which is addressed in the third section. The increasing complexity of new computing architectures, with tightly coupled CPUs and GPUs, as well as high levels of parallelism, requires new parallel models and algorithms exposing the required level of concurrency. Advances in terms of dynamic load balancing, vectorization, GPU acceleration and mesh adaptation have permitted to achieve highly-efficient combustion simulations with data-driven methods in HPC environments. Therefore, dedicated sections covering the use of high-order methods for reacting flows, integration of detailed chemistry and two-phase flows are addressed. Final remarks and directions of future work are given at the end. } The research leading to these results has received funding from the European Union’s Horizon 2020 Programme under the CoEC project, grant agreement No. 952181 and the CoE RAISE project grant agreement no. 951733.

Published
2022

34. Development of the conditional moment closure with a multi-code approach in the frame of Large Eddy Simulations

Author

Pérez Sánchez, Eduardo Javier, Mira, Daniel, Lehmkuhl Barba, Oriol, Houzeaux, Guillaume, and Barcelona Supercomputing Center

Subjects
Large Eddy Simulations (LES), Informàtica::Aplicacions de la informàtica::Aplicacions informàtiques a la física i l‘enginyeria [Àrees temàtiques de la UPC], Finite Element Method (FEM), Parallel processing (Electronic computers), Processament en paral·lel (Ordinadors), Algorismes computacionals, High performance computing, Turbulent combustion modelling, Air pollutants
Abstract

The Conditional Moment Closure (CMC), devised for turbulent combustion modelling, was implemented in the multiphysics code Alya, based on the Finite Element Method (FEM), in the frame of Large Eddy Simulations (LES) for unstructured meshes. A multi-code approach has been developed to run separately the transport equations for non-reacting variables (CFD) and the conditioned quantities (CMC) in two different meshes. The fundamental aspects of the algorithm are discussed while a new strategy for the interpolation between CFD and CMC meshes is described. The Cambridge swirling burner is analysed and simulations results are compared to measurements. The research leading to these results has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under the ESTiMatE project, grant agreement No 821418.

Published
2021

35. Assessment of chemistry reduction in high-pressure spray flames of oxymethylene ethers using large-eddy simulations

Author

Mira, Daniel, Surapaneni, Anurag, Pérez, Eduardo, Both, Ambrus, Lehmkuhl Barba, Oriol, Houzeaux, Guillaume, and Universitat Politècnica de Catalunya. Doctorat en Ciència i Tecnologia Aeroespacials

Subjects
Eddies--Mathematical models, Dinàmica de fluids, Enginyeria de la telecomunicació [Àrees temàtiques de la UPC]
Abstract

This study is focused on the numerical investigation of reduced chemical schemes for high pressure spray flames of oxymethylene ethers (OMEx). A reduced mechanism using Path Flux Analysis (PFA) technique is tested using an a priori and a posteriori evaluation under the ECN Spray A nominal conditions. The global flame metrics for spray A along with the flame shape are well reproduced by the reduced mechanism, which encourages its use for practical applications. The research leading to these results has received funding through the ENERXICO project from the European Union’s Horizon 2020 Programme, grant agreement n 828947, and from the Mexican Department of Energy, CONACYT-SENER Hidrocarburos grant agreement n B-S-69926 and the Spanish Ministry of Economy and Competitiveness in the frame of the CHEST project (TRA2017-89139-C2-2- R). The authors thankfully acknowledge the computer resources at MareNostrum and the technical support provided by Barcelona Supercomputing Center (IM- 2021-1-0014, IM-2020-3-0029, IM-2020-2-0023,IM- 2020-1-0013).

Published
2021

36. Numerical characterization of a technically premixed hydrogen flame under conditions close to flashback

Author

Mira Martínez, Daniel, Lehmkuhl, Oriol, Both, Ambrus, Stathopoulos, Panagiotis, Tanneberger, Tom, Reichel, Thoralf G., Paschereit, Christian Oliver, Vázquez, Mariano, Houzeaux, Guillaume, Universitat Politècnica de Catalunya. Doctorat en Ciència i Tecnologia Aeroespacials, and Barcelona Supercomputing Center

Subjects
Precessing vortex core, Combustió, Swirl-stabilized flames, Combustion, Premixed burner, Flamelet, Aeronàutica i espai::Astronàutica::Enginyeria aeroespacial [Àrees temàtiques de la UPC], Flashback safety
Abstract

This work presents a numerical study of a technically premixed swirling combustor with central air injection at conditions close to flashback using large-eddy simulation with flamelet modelling. This burner has the characteristics of showing flashback at low equivalence ratios, so numerical simulations are set to identify the mechanisms behind the flashback formation. Experimental findings suggest the axial momentum ratio between fuel and air dominates the flame stabilization mechanism and flashback resistance over mixing and equivalence ratio fluctuations. This aspect is investigated here for two operating conditions with the same axial momentum ratio as in the experiment using a perfectly premixed assumption. The two test cases correspond to two stable operating points, far and close to the flashback point. The study shows the assumption of perfect premixing is valid during the stable operation of the burner up to flashback conditions. The experimental results are well predicted under inert and reacting conditions by using a perfectly premixed mixture. It is found that the non reacting flow field develops a self-excited oscillation in the form of a precessing vortex core. This oscillation is attenuated by the fuel injection due to the respective increase in axial momentum and it is ultimately suppressed in the reacting flow field. Both experiments and simulations confirm the same trends. The analysis of the flames have shown certain dynamics as the flashback point is approached. The flashback resistance of the burner is minimized due to an increase in the velocity deficit of the incoming mixture. The recirculation region is shifted upstream, the central recirculation is altered and the flame position is displaced towards the inlet of the reactants in the combustion chamber. The analysis of instabilities and flow dynamics suggest that the formation of flashback can be attributed to combustion induced vortex breakdown, which in turn is associated to the lower axial momentum introduced by the fuel jets in leaner conditions. The research leading to these results has received funding through the Spanish Ministry of Economy and Competitiveness in the frame of the CHEST project (TRA2017- 89139-C2-2-R). Conflict of Interest: Daniel Mira acknowledges the Juan de la Cierva personal grant IJCI-2015-26686 and Ambrus Both the Marie Skłodowska-Curie grant agreement No. 713673 through the ”la Caixa” INPhINIT Fellowship Grant. Computer resources and technical assistance has been provided by the Red Española de Supercomputación (RES) and the Gauss Centre for Supercomputing e.V. (www.gauss-centre.eu) on the GCS Supercomputer SuperMUC at Leibniz Supercomputing Centre (www.lrz.de). The TU Berlin would like to acknowledge the funding received from the EU Seventh Framework Program (FP7/2007-2013) under GA284636 and the European Research Council under the ERC GREENEST with GA247322.

Published
2020
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37. Remoras pick where they stick on blue whales

Author

Flammang, Brooke E., primary, Marras, Simone, additional, Anderson, Erik J., additional, Lehmkuhl, Oriol, additional, Mukherjee, Abhishek, additional, Cade, David E., additional, Beckert, Michael, additional, Nadler, Jason H., additional, Houzeaux, Guillaume, additional, Vázquez, Mariano, additional, Amplo, Haley E., additional, Calambokidis, John, additional, Friedlaender, Ari S., additional, and Goldbogen, Jeremy A., additional

Published
2020
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39. Tuning Alya for Energy Eciency with READEX

Author

Kannan, Venkatesh, Borrell, Ricard, Doyle, Myles, and Houzeaux, Guillaume

Subjects
Horizon 2020, HPC, REDAEX
Abstract

High Performance Computing (HPC) applications are highly complex and demand ecient execution. Energy require- ment of current petascale and future exascale systems is a major cause for concern, and it is crucial to improve the energy-eciency of the applications that run on these systems. A signi cant source of improvement for applications is that they commonly exhibit dynamic resource requirements. Consequently, such dynamism in an application presents opportunity to tailor the utilisation of resources in the HPC system based on the requirements of the application at runtime. READEX (Runtime Exploitation of Application Dynamism for Energy-ecient eXascale computing) is a EU Horizon 2020 FET-HPC project whose objective is to exploit the dynamism found in HPC applications at runtime to achieve ecient computation on exascale systems. Alya is a high performance computational mechanics application that is present in the Uni ed European Application Benchmark Suite and the PRACE Accelerator Benchmark Suite. In this paper, we apply the READEX methodology on Alya to identify and exploit any dynamism that is exhibited. We report on the potential energy savings and the e ects on the application runtime, where we observe 5-20% reduction in the energy consumed by the application.

Published
2019
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40. A FE2 multi-scale implementation for modeling composite materials on distributed architectures

Author

Giuntoli, Guido, Aguilar Mena, Jimmy, Vázquez, Mariano, Oller Martínez, Sergio Horacio, Houzeaux, Guillaume, Universitat Politècnica de Catalunya. Doctorat en Arquitectura de Computadors, and Barcelona Supercomputing Center

Subjects
Algorismes paral·lels, Materials compostos, Parallel algorithms, HPC, Composite materials, High performance computing, Enginyeria dels materials::Materials compostos [Àrees temàtiques de la UPC], Càlcul intensiu (Informàtica), FE2, Multi-scale
Abstract

This work investigates the accuracy and performance of a FE2 multi-scale implementation used to predict the behavior of composite materials. The equations are formulated assuming the small deformations solid mechanics approach in non-linear material models with hardening plasticity. The uniform strain boundary conditions are applied for the macro-to-micro transitions. A parallel algorithm was implemented in order to solve large engineering problems. The scheme proposed takes advantage of the domain decomposition method at the macro-scale and the coupling between each subdomain with a micro-scale model. The precision of the method is validated with a composite material problem and scalability tests are performed for showing the efficiency.

Published
2019
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41. The highlighting of an internal combustion engine piston ring radial oscillations

Author

ZEBBAR, Djallel, MOSTEFA, Kouider, KHERRIS, Sahraoui, and HOUZEAUX, Guillaume

Subjects
Physics::Fluid Dynamics, film thickness, piston ring, friction, Condensed Matter::Statistical Mechanics, lubrication oil, lcsh:Descriptive and experimental mechanics, Physics::Classical Physics, lcsh:Physics, lcsh:QC1-999, hydrodynamic, lcsh:QC120-168.85
Abstract

This paper deals with the definition of the lube-oil film thickness in the piston ringcylinder liner junction of an internal combustion engine. At first, a mathematical modelfor the estimation of the film thickness is established. It is used to point out the oscillating motion of the piston ring normal to the cylinder wall. For the first time, has beenhighlighted and analytically evaluated the oscillating behavior of the piston ring in itshousing in the radial direction. Furthermore, it is demonstrated that the radial oscillations frequency is a function of piston ring stiffness, material and geometry.

Published
2016

42. Robust point-location method for linear and high order meshes. Application to particle transport

Author

Borrell Pol, Ricard, Olivares, Edgar, Houzeaux, Guillaume, and Eguzkitzać, B.

Subjects
High order elements, Finite elements method, Ray casting, Inclusion test, Particle transport, High performance computing, Geometry -- Data processing, Matemàtiques i estadística::Geometria::Geometria computacional [Àrees temàtiques de la UPC], Càlcul intensiu (Informàtica), Informàtica::Arquitectura de computadors [Àrees temàtiques de la UPC], Geometria -- Informàtica, Point-location problem
Published
2018

43. High-Performance Computing : Dos and Don’Ts

Author

Houzeaux, Guillaume

Subjects
Computers / Computer Simulation
Abstract

Computational fluid dynamics (CFD) is the main field of computational mechanics that has historically benefited from advances in high-performance computing. High-performance computing involves several techniques to make a simulation efficient and fast, such as distributed memory parallelism, shared memory parallelism, vectorization, memory access optimizations, etc. As an introduction, we present the anatomy of supercomputers, with special emphasis on HPC aspects relevant to CFD. Then, we develop some of the HPC concepts and numerical techniques applied to the complete CFD simulation framework: from preprocess (meshing) to postprocess (visualization) through the simulation itself (assembly and iterative solvers).

Published
2018

45. Vortex Induced Vibration (VIV) of circular cylinders at high Reynolds numbers

Author

Pastrana Maldonado, Daniel, Cajas García, Juan Carlos, Lehmkuhl Barba, Oriol|||0000-0002-2670-1871, Rodriguez, I., and Houzeaux, Guillaume|||0000-0002-2592-1426

Subjects
Turbulence, Vortex induced vibrations, Física::Física de fluids [Àrees temàtiques de la UPC], Fluid-structure interaction, High performance computing, Vibració, Informàtica::Arquitectura de computadors [Àrees temàtiques de la UPC], Vibration, Càlcul intensiu (Informàtica), Turbulent flow, Turbulència
Abstract

In this contribution, preliminary results on the study of the VIV at high Reynolds numbers are presented. First, a validation of the code and the turbulent LES WALE formulation in conjunction with a low-dissipative discretization is presented by means of the study of the smooth static cylinder at sub-critical and critical regimes: Re = 1.1 x 10 4 and and Re = 3 x 10 5. Finally, some results of the forced damped oscillating cylinder for the Re = 1.1 x 10 4 case are shown. One of the main objectives of this project is to analyse how the movement of the cylinder affects the sub-critical and critical regimes and the influence of this changes in the aerodynamics forces at high Reynolds numbers present in industrial applications.

Published
2017

47. Numerical methods

Author

Agelet de Saracibar Bosch, Carlos, Boman, Romain, Bussetta, Philippe, Cajas García, Juan Carlos, Cervera Ruiz, Miguel, Chiumenti, Michèle, Coll Sans, Abel, Dadvand, Pooyan, Hernández Ortega, Joaquín Alberto, Houzeaux, Guillaume, Pasenau de Riera, Miguel, Ponthot, Jean Philippe, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria, Universitat Politècnica de Catalunya. RMEE - Grup de Resistència de Materials i Estructures en l'Enginyeria, and Universitat Politècnica de Catalunya. GMNE - Grup de Mètodes Numèrics en Enginyeria

Subjects
Matemàtiques i estadística::Anàlisi numèrica::Mètodes numèrics [Àrees temàtiques de la UPC], COMP-DES-MAT Project, COMPDESMAT Project, Anàlisi numèrica -- Programes d'ordinador, Numerical analysis--Computer programs
Abstract

As one of the results of an ambitious project, this handbook provides a well-structured directory of globally available software tools in the area of Integrated Computational Materials Engineering (ICME). The compilation covers models, software tools, and numerical methods allowing describing electronic, atomistic, and mesoscopic phenomena, which in their combination determine the microstructure and the properties of materials. It reaches out to simulations of component manufacture comprising primary shaping, forming, joining, coating, heat treatment, and machining processes. Models and tools addressing the in-service behavior like fatigue, corrosion, and eventually recycling complete the compilation. An introductory overview is provided for each of these different modelling areas highlighting the relevant phenomena and also discussing the current state for the different simulation approaches. A must-have for researchers, application engineers, and simulation software providers seeking a holistic overview about the current state of the art in a huge variety of modelling topics. This handbook equally serves as a reference manual for academic and commercial software developers and providers, for industrial users of simulation software, and for decision makers seeking to optimize their production by simulations. In view of its sound introductions into the different fields of materials physics, materials chemistry, materials engineering and materials processing it also serves as a tutorial for students in the emerging discipline of ICME, which requires a broad view on things and at least a basic education in adjacent fields.

Published
2016

48. SHAPE Project Vortex Bladeless: Parallel multi-code coupling for Fluid-Structure Interaction in Wind Energy Generation

Author

Cajas García, Juan Carlos, Houzeaux, Guillaume|||0000-0002-2592-1426, Yáñez, David J., Mier-Torrecilla, Mónica, and Barcelona Supercomputing Center

Subjects
Wwind turbine, Energia eòlica, Alya system, Parallel computer programs, Fluid-Structure Interaction (FSI), Wind energy conversion systems, Fluid-structure interaction, Enginyeria electrònica [Àrees temàtiques de la UPC], Vortex-Bladeless, Simulació, Mètodes de
Abstract

Vortex-Bladeless is a Spanish SME whose objective is to develop a new concept of wind turbine without blades called Vortex or vorticity wind turbine. This design represents a new paradigm in wind energy and aims to eliminate or reduce many of the existing problems in conventional generators. Due to the significant difference in the project concept, its scope is different from conventional wind turbines. It is particularly suitable for offshore configuration and it could be exploited in wind farms and in environments usually closed to existing ones due to the presence of high intensity winds. The device is composed of a single structural component, and given its morphological simplicity, its manufacturing, transport, storage and installation has clear advantages. The new wind turbine design has no bearings, gears, etcetera, so the maintenance requirements could be drastically reduced and their lifespan is expected to be higher than traditional wind turbines. It is clear that the proposed device is of prime interest, and that scientific investigation of the response of this wind energy generator under different operation scenarios is highly desirable. Thus, the objective of this SHAPE project is to develop the needed tools to simulate Fluid-Structure Interaction (FSI) problems and to reproduce the experimental results for scaled models of the Vortex-Bladeless device. In order to do so the Alya code, developed at the Barcelona Supercomputing Center, is adapted to perform the Fluid-Structure Interaction (FSI) problem simulation. The obtained numerical results match satisfactorily with the experimental results reported. This work was financially supported by the PRACE project funded in part by the EU’s Horizon 2020 research and innovation programme (2014-2020) under grant agreement 653838.

Published
2016

49. Numerical methods

Author

Agelet de Saracibar Bosch, Carlos|||0000-0002-0352-1720, Boman, Romain|||0000-0002-4883-0383, Bussetta, Philippe, Cajas García, Juan Carlos, Cervera Ruiz, Miguel|||0000-0003-3437-6703, Chiumenti, Michele|||0000-0002-6286-7393, Coll Sans, Abel, Dadvand, Pooyan|||0000-0001-9515-9273, Hernández Ortega, Joaquín Alberto|||0000-0001-9334-4002, Houzeaux, Guillaume|||0000-0002-2592-1426, Pasenau de Riera, Miguel, and Ponthot, Jean Philippe

Subjects
COMP-DES-MAT Project, COMPDESMAT Project, Anàlisi numèrica -- Programes d'ordinador, Matemàtiques i estadística::Anàlisi numèrica::Mètodes numèrics [Àrees temàtiques de la UPC], Numerical analysis--Computer programs
Abstract

As one of the results of an ambitious project, this handbook provides a well-structured directory of globally available software tools in the area of Integrated Computational Materials Engineering (ICME). The compilation covers models, software tools, and numerical methods allowing describing electronic, atomistic, and mesoscopic phenomena, which in their combination determine the microstructure and the properties of materials. It reaches out to simulations of component manufacture comprising primary shaping, forming, joining, coating, heat treatment, and machining processes. Models and tools addressing the in-service behavior like fatigue, corrosion, and eventually recycling complete the compilation. An introductory overview is provided for each of these different modelling areas highlighting the relevant phenomena and also discussing the current state for the different simulation approaches. A must-have for researchers, application engineers, and simulation software providers seeking a holistic overview about the current state of the art in a huge variety of modelling topics. This handbook equally serves as a reference manual for academic and commercial software developers and providers, for industrial users of simulation software, and for decision makers seeking to optimize their production by simulations. In view of its sound introductions into the different fields of materials physics, materials chemistry, materials engineering and materials processing it also serves as a tutorial for students in the emerging discipline of ICME, which requires a broad view on things and at least a basic education in adjacent fields.

Published
2016
Full Text
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50. Numbering along advection for Gauss-Seidel and bidiagonal preconditioners

Author

Córdoba, Paula and Houzeaux, Guillaume

Subjects
DDM, Bidiagonal, Càlculs numèrics, Matemàtiques i estadística::Anàlisi numèrica::Mètodes numèrics [Àrees temàtiques de la UPC], Krylov subspace methods, BiCGSTAB, High performance computing, Numerical calculations, GMRES, Càlcul intensiu (Informàtica), Informàtica::Arquitectura de computadors [Àrees temàtiques de la UPC], Domain decomposition methods, Gauss-Seidel
Abstract

Domain decomposition methods (DDM) are often chosen to precondition sparse linear systems of equations, as they are famous to well-improve the convergence of iterative solvers. But at the same time, they are difficult to implement and can be computationally expensive. In this work a new mesh numbering to adapt preconditioning techniques to the physics of different problems is proposed as an alternative to DDM preoconditioning.

Published
2015

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