Fluid-Structure Interaction Modeling by ALE and SPH

Abstract

The outcomes of a research focusing on water modeling and Fluid-Structure Interaction by ALE and SPH in LSTC/LS-Dyna971 are presented in this paper. Firstly the water impact behaviors of a rigid wedge are modeled with water region by ALE and SPH. The size of fluid elements plays critical role to the numerical results, so three different cases varied in mesh or particle spacing both in ALE and SPH methods are detailed discussed. The numerical results are compared both one to the others and to the experimental and theoretical results in terms of vertical velocity and slamming force, which can be concluded that the more elements modeled in the simulation, the better approximation with the experiment results. An additional discussion of propagation of pressure wave by SPH and CPU time are also presented.

A monolithic arbitrary Lagrangian–Eulerian‐based finite element strategy for fluid–structure interaction problems involving a compressible fluid

“…• The key feature in ensuring the satisfaction of the inf-sup conditions in the incompressible limit is the weak implementation of the state relation given by Equation (41) (see Equation (74)). This allows an interpolation of the pressure that is not constrained by the state relation, and the interpolations for the density and temperature (see Section 4).…”

“…Such techniques require very refined mesh for resolving the interface, satisfying the interface conditions, and capturing the boundary layer. With increase in computational power, “mesh‐free” methods such as smooth particle hydrodynamics, 41,42 are becoming very popular. A detailed description and review of recent developments in “mesh‐free” methods for FSI applications can be found in Reference 43.…”

3D Dynamic Hydroelasticity Analysis of Light Weight Pyramidal Sandwich Plates with Imperfection Subjected to Water Impact

“…Due to high complexities, the influence of nonlinearities and fluid-solid interaction (FSI) phenomenon of water impact has been observed by many numerical methods (e.g. Arbitrary Lagrange-Euler Method (ALE) [4], Smoothed Particle Hydrodynamics (SPH) [4]).…”