不同炸药量在工事中爆炸的三维数值模拟

The 3-D Numerical Simulation for Different Explosive Charges in the Fortifications

基于消息传递接口(Message Passing Interface,MPI)模式,阐述了采用Euler方法的PMMIC-3D并行程序基本原理及并行设计策略,并对工事模型进行了数值模拟,数值模拟结果与实际现象及物理规律相符。工事内炸药爆炸产生的爆炸冲击波既有较高的超压峰值,又有较长的作用时间,遇到墙壁时会发生反射,产生反射高压,并会发生绕射汇聚,在墙后面一定区域内产生局部高压,与空中爆炸产生的爆炸冲击波相比,杀伤破坏作用更大。通过数值模拟能够清晰地看到爆炸冲击波的传播过程及其相互作用,可以确定爆炸冲击波到达各个位置处的时间。通过对比各个位置处的峰值超压,可以确定能有效毁伤一个确定工事的最佳药量。

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 numerical- ly 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 con- vergence,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 propaga- tion 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.