DSMC方法模拟强旋流场的初步研究

Primary Study on Simulation of Strongly Rotating Flow Filed Using DSMC Method

采用直接蒙特卡罗方法(Direct Simulation Monte-Carlo,DSMC)从分子运动论层次对离心机流场进行了数值模拟计算。计算程序基于G2程序做了一些修改,修正了径向加权因子,使程序适应更复杂的流场条件,提高了程序效率。通过对等温刚体运动的模拟计算可以看出,该程序的计算结果与等温刚体解基本一致。在离心机壁面边界存在温度梯度时,得到了离心机存在壁面热驱动时产生的气体环流。以上结果表明,DSMC方法具有模拟离心机流场的潜力。

DSMC（Direct Simulation Monte-Carlo） method was utilized to simulate the flow field in a gas centrifuge from the point of view of the kinetic theory.The computational program was based on the improved G2 procedure,in which the radial weight factor was corrected.Relative to the original procedure,the improved program was suitable for simulating more complex flow fields and had higher computation efficiency.The results was consistent with the analytical solution of the isothermal rigid body rotation.The flow field with circulating flows in the gas centrifuge in the case of the wall thermal driven was obtained through fixing the temperature gradients on the wall boundary.The results suggested that DSMC method is capable of the simulations of complicated flow field in a gas centrifuge.