中国物理B ›› 2005, Vol. 14 ›› Issue (7): 1392-1397.doi: 10.1088/1009-1963/14/7/022

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Development and evolution of flow over three-dimensional cylinder

王刚, 梁新刚   

  1. School of Aerospace, Tsinghua University, Beijing 100084,China
  • 收稿日期:2004-10-14 修回日期:2004-12-17 出版日期:2005-06-20 发布日期:2005-06-20

Development and evolution of flow over three-dimensional cylinder

Wang Gang (王刚), Liang Xin-Gang (梁新刚)   

  1. School of Aerospace, Tsinghua University, Beijing 100084,China
  • Received:2004-10-14 Revised:2004-12-17 Online:2005-06-20 Published:2005-06-20

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摘要： By solving the three-dimensional (3D) time-dependent compressible laminar Navier--Stokes equations with a finite-volume method incorporating the third-order-accuracy discretization scheme, the flow structure around a 3D cylinder is investigated and its evolution mechanism is presented in this paper. At high incidence angles, a shed vortex series forms at leeside of the 3D cylinder with its sectional flow pattern very similar to the Karman vortex street developed behind a two-dimensional cylinder. The main, the secondary and the tertiary vortex system compose a hierarchical structure over the 3D cylinder. Each tertiary vortex develops into a new main vortex after the breakaway of its former main vortex, and merges the secondary vortex on its opposite side of the symmetry plane.

Abstract: By solving the three-dimensional (3D) time-dependent compressible laminar Navier--Stokes equations with a finite-volume method incorporating the third-order-accuracy discretization scheme, the flow structure around a 3D cylinder is investigated and its evolution mechanism is presented in this paper. At high incidence angles, a shed vortex series forms at leeside of the 3D cylinder with its sectional flow pattern very similar to the Karman vortex street developed behind a two-dimensional cylinder. The main, the secondary and the tertiary vortex system compose a hierarchical structure over the 3D cylinder. Each tertiary vortex develops into a new main vortex after the breakaway of its former main vortex, and merges the secondary vortex on its opposite side of the symmetry plane.

Key words: 3D cylinder, flow mechanism, vortex merger, quasi-Karman vortex street

中图分类号:  (Laminar flows)

  • 47.15.-x
47.32.-y (Vortex dynamics; rotating fluids) 47.10.ad (Navier-Stokes equations) 47.40.-x (Compressible flows; shock waves)