The 3-D numerical simulation for different explosive charges in the fortifications

The basic principle and the parallel design strategy of the PMMIC-3D parallel program which using Euler method based on the message passing interface (MPI) mode were stated. After numerically stimulating the fortification mode, it can be seen that the results of numerical stimulation basically match with the reality and the physical laws. The shock waves of explosive detonation in fortifications not only had a higher peak overpressure, but also had a longer duration of action. When the shock wave met the wall, it would reflect and produce the reflected high pressure. Because of the diffraction convergence, the local high pressure would be brought about in a certain region behind the wall, in which the destructive effect was much larger compared with the shock waves of air explosion. The propagation process and the interaction of shock waves can be seen clearly by the numerical stimulation, which can determine the arrival time of the shock waves at various positions. The optimal explosive charge can be ensured by comparing the overpressure value of shock waves at different places.