内弹道两相流三维并行数值模拟

为解决火炮内弹道两相流三维数值模拟的计算工作量大及仿真精度低问题，基于任意拉格朗日-欧拉方法建立火炮内弹道三维两相流模型，采用MPI方法进行了分区并行计算。三维控制方程采用高阶MUSCL格式进行空间离散，时间方向采用4阶龙格-库塔法进行求解。三维数值模拟结果揭示了火炮内弹道两相流动过程的三维发展特性，计算得到的内弹道特征参数与文献［20］ 结果符合较好。分析了不同点火管长度及管径对于内弹道性能的影响，为后续开展多维点火性能的优化研究提供了理论基础。并行数值实验表明，采用24个进程的内弹道三维计算，并行效率可提高50%左右。

Parallel Numerical Simulation on Three-dimensional Two-phase Flow of Interior Ballistic Trajectory

A three-dimensional two-phase flow model based on arbitrary Lagrange-Euler method is established to improve the computational accuracy and cost of three-dimensional simulation for interior ballistic in guns. The three-dimensional governing equations are discretized with the MUSCL scheme. The fourth-order Runge-Kutta method is used to solve the time orientation. The numerical method is coded and compiled in the MPI parallel environment. The numerical simulation shows the detailed three-dimensional development of the two-phase flow behavior. The calculated results are in good agreement with the results in Ref.［20］. The effects of different igniter lengths and diameters on interior ballistic performance are analyzed. Parallel numerical studies show that the parallel efficiency can be reduced by about 50% using interior ballistic three-dimensional calculation of 24 processes.