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应用PISO算法及非交错斜交网格技术,编制了求解二维定常、非定常流动的通用程序.计算分析了定常不可压缩Couette流动以及水平通道内方柱绕流尾迹的非定常流动,并详细分析了不同时刻方柱后尾迹的旋涡结构及发展过程,得到了合理的结果.验证了非迭代PISO算法及非交错斜交网格在分析非定常流动中的有效性,为进一步开展非定常流动的数值分析奠定了基础.“,”In this paper, the PISO method is applied in conjunction with non-orthogonal grids and non-staggered arrangement techniques to develop a general computation program for the ana1ysis of two-dimensi0nal steady or unsteady flow. Incompressible Couette flow and unsteady wakes behind a square cylinder have been numerically investigated by the above developed program. The development and the vortex structure of the unsteady wakes are analyzed in detail, and good resu1ts have been obtained. This study demonstrates that the PISO method used in this paper is very effective for the simulations of unsteady flow,and can be widely applied in the ana1ysis of other even more complex unsteady flow.