Journal
COMPUTERS & FLUIDS
Volume 208, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compfluid.2020.104578
Keywords
Lagrangian hydrodynamics; Solid mechanics; Multi-material flows; Interface-aware sub-scale dynamics closure model; Void closure; Void opening
Funding
- National Nuclear Security Administration of the US Department of Energy at Los Alamos National Laboratory [DE-AC52-06NA25396]
- US Department of Energy Office of Science Advanced Scientific Computing Research (ASCR) Program in Applied Mathematics Research
- US Department of Energy National Nuclear Security Administration Advanced Simulation and Computing (ASC) Program
- Czech Technical University [SGS19/191/OHK4/3T/14]
- Czech Science Foundation [18-20962S]
- Czech Ministry of Education [RVO 68407700]
- European Regional Development Fund [CZ.02.1.01/0.0/0.0/16_019/0000778]
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We present a multi-material cell model (closure model) for demanding arbitrary Lagrangian-Eulerian (ALE) simulations of fluids and solids. It is based on the interface-aware sub-scale dynamics (IASSD) approach which utilizes the exact material interface geometry within the computational cell to calculate internal material interactions. Our formulation of the closure model also aims to improve the accuracy in low-speed impact events. Voids are used to represent ambient vacuum and internal free boundaries of the distinct materials. Void regions can close and open at contact surfaces, allowing a transition from contact physics to free motion in vacuum. The coupling of void closure and opening with a new formulation of the IASSD model for solids is tested on several one- and two-dimensional numerical examples, ranging from gas expansion in vacuum to planar and round object impacts at various speeds. (C) 2020 Published by Elsevier Ltd.
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