文中给出了流函数方程及边界条件的坐标转换形式和离散格式，采用了强隐式(SIP)迭代法，分别对具有弓形和半弓形突体的直管进行了计算。

In this paper, the transformed forms of the flow function equation and boundary conditions and their difference expressions are given, and Strongly Implicit Procedure (SIP) iteration is used.

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空间上采用有限元线法进行半离散化，采用已有的轴对称单元、平面单元；

Using Finite Element Method of Lines smash the area in semidiscretization with plane or axial symmetry element which is develop by the postgraduate last session;

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