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Intrinsic relationship of vorticity between modes A and B in the wake of a bluff body

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Lin L M 1   Shi S Y 1 *   Wu Y X 1,2  
文摘 The intrinsic physical relationship of vorticity between modes A and B in the three-dimensional wake transition is investigated.Direct numerical simulations for the flow past a square-section cylinder are carried out at Reynolds numbers of 180 and 250,associated with modes A and B,respectively.Based on the analysis of spacial distributions of vorticity in the near wake,characteristics of the vertical vorticity in modes A and B are identified.Moreover,the relationship of three vorticity components with specific signs is summarized into two sign laws,as intrinsic physical relationships between two instability modes.By the theory of vortex-induced vortex,such two sign laws confirm that there are two and only two kinds of vortex-shedding patterns in the near wake,just corresponding to modes A and B.In brief,along the free stream direction,mode A can be described by the parallel shedding vertical vortices with the same sign,while mode B is described by the parallel shedding streamwise vortices with the same sign.Finally,it is found out that the-type vortex is a basic kind of vortex structure in both modes A and B.
来源 Theoretical and Applied Mechanics Letters ,2018,8(5):320-325 【核心库】
DOI 10.1016/j.taml.2018.05.006
关键词 Mode A ; Mode B ; Wake ; Bluff body ; Sign law
地址

1. Institute of Mechanics,Chinese Academy of Sciences, Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Chinese Academy of Sciences, Beijing, 100190  

2. School of Engineering Sciences,University of Chinese Academy of Sciences, Beijing, 100049

语种 英文
文献类型 研究性论文
ISSN 2095-0349
学科 力学
基金 supported by the Strategic Priority Research Program of the Chinese Academy of Science
文献收藏号 CSCD:6379773

参考文献 共 12 共1页

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引证文献 2

1 Lin L M DNS in evolution of vorticity and sign relationship in wake transition of a circular cylinder:(pure)mode A Acta Mechanica Sinica,2019,35(6):1131-1149
被引 2

2 林黎明 低雷诺数下钝体三维尾迹中的涡量符号律 物理学报,2020,69(3):034701
被引 0 次

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