The convection term is discretized with upwind-central difference scheme, while the pressure equation is solved by SOR.
对流项用迎风—中心差分格式模拟，压力方程用SOR法迭代求解。
The first is a convective problem, and solved by the central-upwind deference scheme;
对流过程采用逆风-中心差分格式求解；
The N-S equation's convection term and dissipation term are discretized using the third-order upwind compact scheme and the fourth-order central compact scheme, respectively.
方程的对流项和扩散项分别采用三阶迎风紧致格式和四阶中心紧致格式离散。
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