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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.
The boundary sampling technique which is suitable for particle parameters reasonably arranged in the calculation area according to the inlet boundary conditions is studied in the calculation of 3D Simulation Direct Carlo Monte Carlo method.A new method is proposed based on the boundary sampling which crosses the entrance boundary, And the statistical data of particle impacting the boundary of the wall to obtain the macro-flow field parameters at the boundary, a new boundary statistical technique is added to make up for the fact that the traditional statistical techniques in DSMC can only obtain the internal parameters of the flow field and can not obtain the parameters of the flow field at the interface. The interface statistics technique has universal applicability, which is not limited to the DSMC method. Taking infinity flow around the ball as an example, the validity of boundary sampling and statistical techniques of DSMC method is verified.