| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Late-Stage Vortical Structures and Eddy Motions in a Transitional Boundary Layer |
| LIU Xiao-Bing1,2, CHEN Zheng-Qing1, LIU Chao-Qun2 |
| 1Wind Engineering Research Center, Hunan University, Changsha 4100822Department of Mathematics, University of Texas at Arlington, Arlington, Texas 76019, USA |
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| Cite this article: |
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LIU Xiao-Bing, CHEN Zheng-Qing, LIU Chao-Qun 2010 Chin. Phys. Lett. 27 024706 |
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Abstract A high-order direct numerical simulation of flow transition over a flat-plate at a free stream Mach number 0.5 is carried out. Formation and development of three-dimensional vortical structures, typically shown as λ-vortices, hairpin vortices and ring-like vortices, are observed. Numerical results show that there is a strong downdraft motion of fluid excited by every ring-like vortex in the late-stage of the transition process. At two sides of the vortical structure centerline, the downdraft motions induced by the ring-like vortex and the rotating legs superimpose. This is responsible for the appearance of a high-speed streak associated with the positive spike observed in a previous investigation and the appearance of a high-shear layer in the near wall region.
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| Keywords:
47.27.Cn
47.27.De
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Received: 15 July 2009
Published: 08 February 2010
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