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利用Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ（Ｎ－Ｓ）方程与Ｏｓｅｅｎ方程的耦合，设计出了原始变量下稳态不可压Ｎ－Ｓ方程在出流边界上的一个耦合边界条件。数值结果表明，耦合边界条件比Ｄｉｒｉｃｈｌｅｔ边界条件要精确得多。
By coupling the Navier-Stokes (N-S) equation with the Oseen equation, a coupled boundary condition of the incompressible Navier-Stokes (N-S) equation on the outflow boundary is designed. Numerical results show that the coupling boundary conditions are much more accurate than the Dirichlet boundary conditions.