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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 42
ADVANCES IN COMPUTATIONAL METHODS FOR SIMULATION
Edited by: B.H.V. Topping
Paper I.6

A Semi-Eulerian Method for Treating Lagrangian Sliding Interfaces

W.H. Lee

Los Alamos National Laboratory, Los Alamos, United States of America

Full Bibliographic Reference for this paper
W.H. Lee, "A Semi-Eulerian Method for Treating Lagrangian Sliding Interfaces", in B.H.V. Topping, (Editor), "Advances in Computational Methods for Simulation", Civil-Comp Press, Edinburgh, UK, pp 45-53, 1996. doi:10.4203/ccp.42.1.6
Abstract
In many two-dimensional Lagrangian radiation hydrodynamic calculations, shear along material boundaries is a serious problem. Since the mesh is tied to the material, this shear will cause distortions in the mesh that make the calculations very difficult. The approach described in this paper adopts a semi-Eulerian calculation that allows material flow through a Lagrangian mesh along an interface. The basic idea is to consider each point along the slip line temporarily as a double point. One would then calculate the motion of each point separately and then pull the points back together using the automatic rezone method. This would allow the materials to shear along the interface. This paper will describe the method as used in a two-dimensional Lagrangian code. The formation of a shaped charge jet is computed using the present method, and the results are discussed with and without the slip treatment. A nonsymmetric radiation-driven shock problem is also shown.

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