考查了线性组合方程的解在特征角面顶点的值，并给出了柯西问题解对初值的必要条件。

The value of solution for the linear equation at the conic point is derived, and the necessary condition satisfied by the Cauchy's problem solution is given.

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建立了正三角形钝体尾迹流流动模型，基于冷态实验对粗糙壁面钝体尾迹流进行了求解，并与光滑壁面钝体的解进行了比较。

Mathematical analysis and numerical simulation is performed for the flow field near a rough wall based on an improved theoretical model proposed for the problem.

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