Abstract: After analyzing the inner parallel character of DSMC method, a parallel algorithm for DSMC suited to distributed memory parallel system was constructed . Based on efficiency evaluation principle, some modifying techniques was also brought out. With above parallel algorithm, the simulation of attitude control thruster nozzle interior flowfield is finally realized with DSMC method using NOWS system. Some factors affecting parallel efficiency were also discussed. Computation results show the necessity and effctiveness of parallization of DSMC method.

Key words: Attitude rocket engine;Nozzle flow;Flow distribution;Monte Carlo method;Parallel algorithm;Numerical simulation

摘要： 在分析了直接仿真Monte carlo (DSMC)方法内在并行度的基础上 ,针对工作站群机并行系统 (NOWS)分布主存的特点 ,构造了适合于DSMC仿真的并行算法模型 ,在PVM环境下将其应用于姿控发动机喷管内流场的DSMC仿真 ,结合并行算法效率评价准则对如何提高并行计算效率进行研究。仿真结果表明了实施DSMC并行计算的必要性与有效性。

关键词: 姿控火箭发动机;喷管气流;流动分布;蒙特卡罗法;并行算法;数值仿真