振荡叶栅非定常流场的N-S方程解

NUMERICAL SOLUTION OF N-S EQUATIONS FOR UNSTEADY FLOW FIELD AROUND OSCILLATING CASCADES

本文采用直接解N-S方程的方法求解振荡叶栅的非定常流场.数值格式采用MC-LB显隐格式,时间步长可以取得较大,故总计算时间并不比用显格式直接解Euler方程长很多.计算结果与无粘结果基本一致.但来流时均静压比定常来流静压略有提高,这是与无粘计算不同之处.

In this paper a numerical method directly using N-S equation to solve the unsteady flow field around oscillating cascades is developed. The MC-LB explicit-implicit scheme is adopted, with which longer time steps can be used so that the CPU time is not much longer than that with a explicit scheme using Euler equations. The numerical results are basically consistent with those from Euler solution, but the time-averaged static pressure at the inlet is slightly larger than that of the steady flow, that is different from the nonviscous solution.