Author(s)

S. Kubota, Z. Liu, T. Saburi, Y. Ogata & M. Yoshida

Abstract

We have developed the two-dimensional Eulerian hydrodynamic code to estimate various explosion phenomena which include large deformation, multimaterial flow and the shock initiation process. The CIP method has been adopted to reduce numerical diffusion caused by calculation of the advection term in the Euler equations. To solve the initiation process of energetic material, an ignition and growth model has been employed. In this study numerical simulations of sympathetic detonation in the gap test were carried out. The charge diameter and gap length were varied to understand the size effect on the sympathetic detonation. We found that the critical gap length and the charge weight approximately have a linear relationship with a logarithmic scale. Keywords: Eulerian hydrodynamic code, CIP method, ignition and growth model, gap test, sympathetic detonation. 1 Introduction The practical problems for the risk assessment of the energetic materials include various complicated phenomena, large deformation of the materials, multimaterial flows and the chemical reaction of energetic materials. For the problems that include the materials interfaces, the Lagrangian coordinate system is suitable to simulate the phenomena. However for solving the large deformation process of material the Lagrangian method encounter the difficulty because of the mesh crashes, and therefore we have selected the Eulerian coordinate system in our CFD code [1, 2]. In this case the two major problems remain. One is how to prevent the large numerical diffusion occurred by calculation of advection term

Keywords

Eulerian hydrodynamic code, CIP method, ignition and growth model, gap test, sympathetic detonation.