但由于可压缩非定常位势流动的控制方程是双曲型的，简单地把时间当作同空间一样的物理维来求解是不可行的。
Because the governing equations for compressible unsteady potential flow is hyperbolic, looking time dimension as space dimension in the same way is never appropriate.
目前，在计算非定常不可压缩流动的原始变量形式的数值方法中，投影方法得到了越来越广泛的应用。
The projection methods are currently among the most popular methods for solving viscous incompressible flow based on the primitive variable formulations.
本文研究了定常、非定常二维粘性不可压缩流动在分离点附近的流线性状，给出了判定分离的通用判据。
The streamline behaviour near a separation point of two dimensional steady and unsteady viscous flow is studied, and a general criterion for flow separation is presented in this paper.
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