Search

Abstract In this paper, we develop an optimal particle setup method for initial condition with Centroidal Voronoi Particle (CVP) dynamics, which combines the Centroidal Voronoi Tessellation (CVT) and Voronoi Particle (VP) concept. CVT optimizes the energy function in terms of compactness and consequently ensures the isotropy of particle distribution. The CVT configuration is computed by Lloyd's algorithm, which decreases the energy function monotonically. A physics-motivated model equation with tailored equation of state (EOS) is employed to relax the Voronoi particle system such that the convergent equilibrium matches the target configuration. The resulting particle distribution approximates the given analytical profiles of spatially adaptive density, smoothing-length and mass distribution with high interpolation accuracy. The level-set method is introduced to describe arbitrarily complex geometries. A set of Smoothed Particle Hydrodynamics (SPH) simulations is computed to demonstrate the performances of the proposed method. Without parameter tuning, good performance is obtained for presented benchmarks implying its promising potential. [ABSTRACT FROM AUTHOR]

An enhanced fully-Lagrangian meshfree computational method is developed for simulating incompressible fluid–elastic structure interactions. The developed method corresponds to a SPH (Smoothed Particle Hydrodynamics)-based coupled FSI (Fluid–Structure Interaction) solver. Coupling is conducted in between a projection-based ISPH (Incompressible SPH) fluid model and a newly developed SPH-based structure model in a mathematically–physically consistent manner. Fluid model is founded on the solution of Navier–Stokes and continuity equations while structure model is set on conservation laws for linear and angular momenta corresponding to an isotropic elastic solid. A set of previously developed enhanced schemes are incorporated for the ISPH fluid model, hence, the developed coupled method is referred to as Enhanced ISPH–SPH. The performance of SPH-based structure model is first validated in reproduction of benchmark tests including dynamic response of a free oscillating cantilever plate and stress distribution inside an isotropic plate with a circular opening. Then the Enhanced ISPH–SPH is scrupulously verified through simulations of FSI problems including hydrostatic water column on an elastic plate, dam break with an elastic gate, sloshing in tanks with elastic baffles and hydroelastic slammings of an elastic aluminum wedge and a marine panel. To the best knowledge of the authors, this paper presents the first semi-implicit/explicit ISPH–SPH coupled method for FSI related to deformable elastic structures with comprehensive validations and performance investigations. [ABSTRACT FROM AUTHOR]

Abstract: This paper presents a new contact algorithm to analyze an elasto-plastic contact problem using the SPH (Smoothed Particle Hydrodynamics) method. This algorithm is available to both contact types, which are the particle-to-particle contact and the surface-to-particle one. It is employed to determine the actual boundary normal vector and apply the reproducing condition in the cylindrical coordinate. The variational equation based on the virtual work principle is derived and its solution is obtained by the penalty method, which includes both a penetration and a penetration rate. Numerical simulations are presented to show that the proposed algorithm can be applied to the elasto-plastic contact problem for the case that either both bodies are deformable or one is a rigid wall and the other is deformable. Two colliding bodies can be separated with the expected rebound velocity and the total contact force acting on between them similar to theoretical value. Results of the rod impact analysis are shown to be in agreement with the ones obtained by other solution and experiment. [Copyright &y& Elsevier]