三维层流分离的N-S方程隐式上风格式数值模拟

Three-Dimensional N-S Solve for Laminar Separated Flow Using an Implicit Upwind Scheme

数值模拟了绕半圆球柱M∞＝1．2，a＝19°的粘性分离流和涡流．用隐式LU－SGS及Roe的通量差分分裂格式数值求解了薄层N－S方程，分析计算了所得的流场结构，包括物体背风面的涡流及三维分离方式，计算结果同实验结果定性及定量吻合很好，另外，还用流动拓扑理论分析了计算所得的流场形态。

Viscous separated and vortical flows surrounding a hemisphere-cylinder at M∞ =1. 2, a= 19°have been computed. An algorithm featuring implicit LU-SGS and Roe's Flux Difference Splitting has been used to solve the thin-layer N-S equations. The resulting flowfield structures, including the vortical f1ow on the leeward side of the body and the threedimensional separation patterns, have been investigated. The computed results show good qualitative and quantitatiye agreement with experimental data. Further, the flow topological concept was used to analyze the computed flowfield structures.