Physics of multiple level hairpin vortex structures in turbulence

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• 作者：YiQian Wang ; Hassan Al-Dujaly ; YongHua Yan…
• 关键词：hairpin vortex ; vortex buildup ; multiple level vortices ; flow transition
• 刊名：SCIENCE CHINA Physics, Mechanics & Astronomy
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：59
• 期：2
• 全文大小：3,392 KB
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• 作者单位：YiQian Wang (1) (2)
  Hassan Al-Dujaly (2)
  YongHua Yan (2)
  Ning Zhao (1)
  ChaoQun Liu (2)
  
  1. Department of Aerodynamics, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
  2. Department of Mathematics, University of Texas at Arlington, Arlington, 76019, USA
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  Mechanics, Fluids and Thermodynamics
  Physics
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1927

文摘

Previous experimental and numerical studies have revealed that the hairpin vortex is a basic flow element of transitional boundary layer. The hairpin vortex is believed to have legs, necks and a ring head. Based on our DNS study, the legs and the ring head are generated separately by different mechanisms. The legs function like an engine to generate low speed zones by rotation, create shear layers with surrounding high speed neighbor fluids, and further cause vortex ring formation through shear layer instability. In addition, the ring head is Ω-shaped and separated from quasi-streamwise legs from the beginning. Contrary to the classical concept of “vortex breakdown”, we believe transition from laminar flow to turbulence is a “buildup” process of multiple level vortical structures. The vortex rings of first level hairpins are mostly responsible for positive spikes, which cause new vorticity rollup, second level vortex leg formation and finally smaller second level vortex ring generation. The third and lower level vortices are generated following the same mechanism. In this paper, the physical process from Λ-vortex to multi-level hairpin vortices is described in detail.