DSMC方法的边界采样与统计技术  

Boundary sampling and statistical techniques in DSMC method

作　　者：侯凤龙[1] 蔡国飙[1] 

机构地区：[1]北京航空航天大学宇航学院,北京100191

出　　处：《北京航空航天大学学报》2010年第2期159-162,共4页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：研究了适合在三维直接模拟蒙特卡罗(DSMC,Direct Simulation Monte Carlo)方法计算中根据入口边界条件合理地布置进入计算区域内粒子参数的边界采样技术.提出了一种根据穿越入口边界、出口边界以及撞击壁面边界的粒子统计数据获取边界位置处宏观流场参数的新型边界统计技术,弥补了DSMC计算中传统统计技术仅能够获取流场内部参数,不能够获取界面处流场参数的不足.这种界面统计技术具有普遍的适用性,不仅限于DSMC方法.以无穷远来流圆球绕流为例进行计算,验证了DSMC方法的边界采样与统计技术的有效性.A boundary sampling technique suitable for three-dimensional DSMC （direct simulation Monte Carlo） calculations was studied, which could be used to give proper entering particle parameters according to the inlet conditions. A new kind of boundary statistical technique was proposed, which could be taken to obtain macroscopic flow parameters just at the boundary interface, from the statistical data of the entering or escaping particles or the ones impinging on the wall. This new statistical technique makes up for the defective of traditional DSMC statistical technique, which can only get the inner flow field parameters, but can not get the interface parameters. This statistical technique is essentially a universal arithmetic, not just suitable for the DSMC method. A calculation of infinite far flow passing around a sphere was carried out. The results show that the sampling and statistical techniques are effective.

关 键 词：直接模拟蒙特卡罗方法 采样技术 统计技术 

分 类 号：V211.25[航空宇航科学与技术—航空宇航推进理论与工程]