航空学报 > 2003, Vol. 24 Issue (6): 491-494

两种湍流模式对绕椭球体三维分离流计算的比较

祝成民, 忻鼎定, 庄逢甘   

  1. 北京航空航天大学流体力学研究所 北京 100083
  • 收稿日期:2002-08-22 修回日期:2003-06-17 出版日期:2003-12-25 发布日期:2003-12-25

A Comparison of Two Turbulence Models on Computation of Three-Dimensional Separated Flow Around a Prolate Spheroid

ZHU Cheng-min, XIN Ding-ding, ZHUANG Feng-gan   

  1. Institute of Fluid Mechanics; Beijing University of Aeronautics and Astronautics; Beijing100083; China
  • Received:2002-08-22 Revised:2003-06-17 Online:2003-12-25 Published:2003-12-25

摘要: 将新近的Shih??Lumley( S-L) 模式应用于雷诺数为7.2×106 的6 1 椭球绕流的全N-S 方程计算, 作为参考也计算了Jonse??Launder( J-L) 模式。在没有发生分离时, 两种湍流模式计算的平均流场与实验结果符合较好。在分离发生后, J-L 模式计算的分离结构与实验差别很大, 没有计算出二次分离线; S-L模式的计算结果较好, 计算得到的表面摩擦力线图谱中主要分离结构与实验结果较接近, 分离区的表面压力系数分布也与实验值定性相符; 在S??L模式计算结果中, 壁面附近出现小尺度的分离再附结构.

关键词: 椭球, 分离流, 数值模拟, 湍流模式

Abstract: T he turbulence model Shih??Lumley ( S-L) is applied to compute full N-S equatio ns. The model Jones??Launder ( J-L) is also employed for comparison. When the flow is att ached, the averaged flow fields both modelsconform to the exper iment results. But, after t he separ at ion occurs, structures of separation computed on bo th mod??els dev iate from the ex periment r esults to var ious degr ees. The difference of J-L model is bigg er . The r esulting lowon J-L model yields no secondar y separation line and thus differs appreciably from the exper iment results. The mainsepar at ion str uctures of skin fr ict ion lines computed on S??L model conform better to the experiment results, and thedistr ibut ion of coefficients of wall pressure is co nsistent with ex periment qualitatively , moreov er there appears small??scale separated??reattached structures appear in the near w all region.

Key words: prolate spheroid, separated flow, numerical simulation, turbulence model

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