Numerical Simulation of Blast-Wave-Particle and Contact Interaction Induced by a Detonation in Condensed Matter

摘要

In this paper we present planar and axisymmetric numerical simulations of detonation-induced blast-wave-particle and contact interaction. The numerical method is a finite-volume based solver with diffuse material interface model. Validation of the solver is demonstrated by comparing to existing experimental data. We compute the unsteady inviscid drag coefficient as a function of time, and show that the force due to contact impact on particles is orders of magnitude higher than that by interaction with the transimitted shock in air, and the pressure in the particle due to contact impact is on the order of the shock pressure in the explosive, leading to significant compaction of the pack. Also, the interaction of layers of particles introduces additional subsequent drag and pressure peaks. The maximum drag coefficient increases with packing fraction, and the higher the packing fraction, the closer the value of C_d to that of 1-D. We also demonstrated that the drag is higher in planar than in axisymmetric geometry, as expected and similar to the well known results of flow past cylinder versus sphere.