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通过数值模拟，研究了矩形空腔在亚音速外流下的流激振荡问题。采用显式ＭａｃＣｏｒｍａ－ｃｋ二步预估校正有限差分格式，求解二维雷诺平均非定常Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程；并用Ｃｅｂｅｃｉ－Ｓｍｉｔｈ代数紊流模型作适当修正来模拟紊流效应，对有、无前缘声激励两种情况的空腔流场作了数值模拟，计算的振荡频率及振荡幅值都与实验结果基本符合，并且较好地模拟出了声激励对流场的影响。
Through numerical simulation, the problem of flow oscillation of rectangular cavity under sub-subsonic outflow was studied. An explicit MacCorma-ck two-step corrected finite difference scheme was used to solve two-dimensional Reynolds averaged unsteady Navier-Stokes equations. The Cebeci-Smith algebraic turbulence model was used to simulate the turbulence effect, The cavity flow field in both cases is numerically simulated. The calculated oscillation frequency and oscillation amplitude are in good agreement with the experimental results, and the effects of acoustic excitation on the flow field are well simulated.