High resolution numerical simulation of detonation wave shock-induced void collapse in condensed explosives

The detonation wave shock-induced collapse of voids in condensed explosives was studied. Combining RGFM with Level-set method for the material interface, the nonphysical oscillation problem was overcome, which caused by high-density ratio and high-pressure ratio between material interfaces. Taking a third-order TVD Runge-Kutta method for time scattering and the fifth-order high-resolution weighted essentially non-oscillatory (WENO) finite difference scheme for space scattering, a parallel solver was developed to simulate the collapse of voids in condensed explosives. Firstly, the detonation distance with different incident pressure and the pressure history curves with the impact initiation process were presented, and then compared with the experimental results. Further the code was used to simulate the void collapse process, and the density, pressure and particle velocity contours in different moments were given. With the density and energy convergence, the jet phenomenon formed can be clearly seen in the hole, and then further form a hot spot in high temperature and high pressure.