Constrained optimization framework for interface-aware sub-scale dynamics models for voids closure in Lagrangian hydrodynamics

JOURNAL OF COMPUTATIONAL PHYSICS

卷:371

Article

Barlow, Andrew¹  Klima, Matej^2,3  Shashkov, Mikhail³ 

[1] AWE Aldermaston, Computat Phys Grp, Reading RG7 4PR, Berks, England

[2] Czech Tech Univ, Fac Nucl Sci & Phys Engn, Brehova 7, Prague 11519 1, Czech Republic

[3] Los Alamos Natl Lab, X Computat Phys, XCP-4, Los Alamos, NM 87545 USA

关键词: Lagrangian hydrodynamics;    Multimaterial cells;    Interface-aware sub-scale closure models;    Void closure;   

DOI  :  10.1016/j.jcp.2018.03.034

来源: Elsevier

【 摘 要 】

In hydrocodes, voids are used to represent vacuum and model free boundaries between vacuum and real materials. We give a systematic description of a new treatment of void closure in the framework of the multimaterial arbitrary Lagrangian-Eulerian (ALE) methods. This includes a new formulation of the interface-aware sub-scale-dynamics (IA-SSD) closure model for multimaterial cells with voids, which is used in the Lagrangian stage of our indirect ALE scheme. The results of the comprehensive testing of the new model are presented for one- and two-dimensional multimaterial calculations in the presence of voids. We also present a sneak peek of a realistic shaped charge calculation in the presence of voids and solids. (C) 2018 Elsevier Inc. All rights reserved.

【 授权许可】

Free