外流问题的外边界条件设计

Open boundary condition for viscous flow around a body

粘性外流计算原则上要求在无限大的外空间进行 ,巨大的计算区要求巨大的计算机资源。本文利用一般绕流问题在远区流动尺度大 ,因而雷诺数大的特点对远外处的流动近似地用位势流代替 ,从而在较小的流体边界条件上建立了“开边界条件” ,由此大大缩小了计算工作量。

The computation of the viscous flow around a finite body requires the computation domain to be very large and enormous computation resources are needed. In this paper, an open boundary condition based on the potential flow theory was designed by which the real N S equation computation for solving the N S equations domain was considerably shrunk.