基于pOTM方法的超高速碰撞并行数值模拟研究

Parallel Research on Numerical Simulation of Hypervelocity Impact Based on pOTM Method

基于最优输运无网格方法理论,利用Fortran语言编写了pOTM方法并行计算程序,进行了弹丸超高速正撞击单层靶板的数值模拟研究,分析了不同量级模型规模以及不同核心数对并行效率的影响。研究结果表明:在一定量级模型规模内,模型的计算结果随着网格的加密基本保持稳定,验证了pOTM方法网格的收敛性;采用pOTM方法模拟得到的靶板弹坑直径以及碎片云的形态和质量分布与实验结果吻合较好,验证了pOTM方法求解超高速碰撞问题的有效性;此外,对于并行规模百万量级以下的模型,其加速比可以达到12,可以很大程度上节省CPU计算时间。

A parallel calculation program of pOTM method was compiled using Fortran language based on the Optimal Transportation Meshfree method theory.The numerical simulation study of projectile hypervelocity impact on a single-layer target plate was carried out.The effects of different scale models and different number of cores on the time consumption of parallel computation were analyzed.The research results show that within a certain scale of model,the calculation results of the model are basically stable with grid encryption,which verifies the convergence of pOTM method grid.The target crater diameter and the shape and mass distribution of the debris cloud simulated by the pOTM method are in agreement with the experimental results,indicating that the pOTM method is very suitable for solving hypervelocity collision problems.In addition,for the parallel scale of millions of magnitudes the following model can achieve a speedup ratio of 12,which can greatly save CPU computing time.