Author(s)

E. L. Baker, D. Pfau, J. M. Pincay, T. Vuong & K. W. Ng

Abstract

A variety of mesh reduction methodologies (MRM) have been developed for use in high rate continuum modeling. An adaptive mesh refinement (AMR) technique has been implemented for use in the CTH high rate Eulerian finite difference model. This new implementation allows increased rectilinear mesh refinement in localized areas of interest. We have applied this AMR to successfully resolve dominating physical phenomena involved in concrete wall impact modeling, as well as physical phenomena observed at the material interface of explosively welded metals. In addition, a variety of MRM relaxation algorithms have been developed for high rate continuum Arbitrary Lagrangian-Eulerian (ALE) modeling. These relaxation algorithms are now routinely used to provide the high resolution simulation of explosively produced metal jetting using the CALE computer program. Finally, a multi-mesh MRM technique has been implemented in the ALE-3D computer model. This MRM technique has been used to provide the modeling of fragment impact for the development of safer munitions. These new MRM techniques are now allowing the high rate continuum modeling of physical phenomena that was not previously simulated. Keywords: mesh reduction methodologies, high rate continuum modeling, impact physics, high explosives. 1 Introduction High rate continuum modeling is used for the modeling of high rate events including high explosive detonation and high velocity impact. These models typically provide explicit second order integration in time and space of the

Keywords

mesh reduction methodologies, high rate continuum modeling, impact physics, high explosives.