中文摘要：

采用有限体，有限元混合格式、非结构网格和大涡模拟方法求解可压缩的N—S方程，对Re=22000的方柱绕流进行数值模拟，并对不同的边界条件进行详细的分析比较．通过对以往研究经验的总结和利用精细的边界条件，使得采用二阶精度的数值格式和较稀疏的网格仍然得到了令人满意的计算结果，甚至优于以往采用密网格的模拟结果．

英文摘要：

The flow around a square cylinder at Re = 22 000 is simulated with large eddy simulation （LES）. The effect of boundary condition is studied. A mixed finite-volume finite-element method with unstructured grids is adopted to solve filtered compressible Navier-Stokes equations. Though the numerical accuracy is only second order and the grids is relatively coarse, the results are satisfactory and even better ＂ than those with much finer meshes.