【摘要】 开路边条件（Ｏｐｅｎ Ｂｏｕｎｄａｒｙ Ｃｏｎｄｉｔｉｏｎ）的设计是计算流体力学中较难的课题。利用Ｎａｖｉｅｒ—Ｓｔｏｋｅｓ方程在远场的摄动解作为设计ＯＢＣ的基础，对文献［１］提出的四个问题中的第一个（二维定常、层流不可压的管道后台阶流动）进行了检行了检验，结果表明我们设计的ＯＢＣ基本上是成功的。更多还原

【Abstract】 The design of open boundary condition(OBC) is one of the most challenging problems in the field of nummerical computation for N. S. equation. In this article the perturbation solution of N.S. equation in the region approaching to infinity is taken as the basis for designing the OBC. A testing example proposed by M.philip has been calculated. The results show that the present OBC is superior to all others existing in literature.更多还原