大尺度网格下 DSMC 仿真碰撞概率的修正方法

摘要

从 DSMC 碰撞概率的实现途径出发，通过引入最小二乘法及亚松弛的思想给出一种大尺度网格下分子仿真碰撞概率的修正方法，将该方法应用于非结构四面体网格下的 DSMC 模拟中，计算分析了文献中钝锥模型的绕流结果，数值结果初步验证了本文方法的合理性和有效性。%A new modification technique of collision probability with least square method and sub-relaxa-tion technique is introduced to improve simulation precision in DSMC with coarse grid size.The new method is applied to direct simulation Monte Carlo method based on unstructured tetrahedral cells.Flow around blunt cone is investigated,and the numerical results confirm feasibility of the modification tech-nique.