三维复杂爆炸流场的大规模并行计算

LARGE-SCALE PARALLEL COMPUTATION FOR THREE-DIMENSIONAL COMPLEX EXPLOSION FIELD

采用Euler方法的并行计算不仅能够很好地处理爆炸与冲击问题中的大变形、多种物质的交界面及各种强间断,而且还可以满足爆炸与冲击问题的大规模数值模拟需求.针对Euler方法并行程序设计的复杂性,阐述了实现并行程序的总体策略,基于消息传递接口(MPI)模式,自主开发了相应的PMMIC-3D并行程序.对两类复杂工事模型进行数值模拟,数值模拟结果与实际现象及物理规律基本吻合,可以清晰地反映冲击波的传播过程及其相互作用.通过比较不同位置处的冲击波峰值超压发现工事成锐角型走向能够有效地减小冲击波的毁伤.此外,由峰值超压的大小可以判断不同装药量下工事的毁伤程度.

Parallel computing using the Eulerian method can not only deal with the problem of large deformation,mutil-material and all kinds of strong discontinuity existing in explosion and shock problems,but also satisfy the needs of large-scale numerical stimulation.For the complexity of parallel program using Eulerian method,the general strategy for the parallel program design was studied,and the relevant PMMIC-3Dparallel hydrocode was developed based on the MPI mode.Through stimulating explosions in two kinds of complicated fortifications,it can be seen that the numerical results were basically matched with the physical laws.The propagation process and the interaction of shock waves can be seen clearly.By comparing the overpressure value of shock waves in different places,it is discovered that the fortifications placed at an acute angle can decrease the damage of shock waves effetely.The damage degree of the fortification at different explosive mass can also be judged by the overpressure value.