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Effect of perforation on flow past a conic cylinder at Re = 100: wavy vortex and sign laws

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Lin L M 1   Zhong X F 1   Wu Y X 1,2  
文摘 In order to find the intrinsic physical mechanism of the original Karman vortex wavily distorted across the span due to the introduction of three-dimensional (3-D) geometric disturbances, a flow past a peak-perforated conic shroud is numerically simulated at a Reynolds number of 100. Based on previous work by Meiburg and Lasheras (1988), the streamwise and vertical interactions with spanwise vortices are introduced and analyzed. Then vortex-shedding patterns in the near wake for different flow regimes are reinspected and illustrated from the view of these two interactions. Generally, in regime I, spanwise vortices are a little distorted due to the weak interaction. Then in regime II, spanwise vortices, even though curved obviously, are still shed synchronously with moderate streamwise and vertical interactions. But in regime III, violently wavy spanwise vortices in some vortex-shedding patterns, typically an Ω-type vortex, are mainly attributed to the strong vertical interactions, while other cases, such as multiple vortex-shedding patterns in sub-regime III-D, are resulted from complex streamwise and vertical interactions. A special phenomenon, spacial distribution of streamwise and vertical components of vorticity with specific signs in the near wake, is analyzed based on two models of streamwise and vertical vortices in explaining physical reasons of top and bottom shear layers wavily varied across the span. Then these two models and above two interactions are unified. Finally two sign laws are summarized: the first sign law for streamwise and vertical components of vorticity is positive in the upper shear layer, but negative in the lower shear layer, while the second sign law for three vorticity components is always negative in the wake.
来源 Acta Mechanica Sinica ,2018,34(5):812-829 【核心库】
DOI 10.1007/s10409-018-0758-z
关键词 Vortex-shedding pattern ; Flow control ; Vortex dynamics ; Conic disturbance ; Perforation ; 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 0567-7718
学科 力学
基金 supported by the National Key Scientific Instrument and Equipment Development Program of China
文献收藏号 CSCD:6359400

参考文献 共 25 共2页

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引证文献 3

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
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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
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