中文说明：采用流函数方法对二维圆柱扰流问题进行数值模拟，采用贴体网格，进行坐标变换后求解，得到的数值计算结果与理论解吻合得很好。
English Description：
The flow function method is used to simulate the flow around a two-dimensional cylinder. The body fitted grid is used to solve the problem after coordinate transformation. The numerical results are in good agreement with the theoretical solution.