The spatial-temporal evolution of coherent structures in log law region of turbulent boundary layer

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• 作者：Xiao-Bo Zheng (1)
  Nan Jiang (1) (2) (3)
  
  1. Department of Mechanics ; Tianjin University ; 300072 ; Tianjin ; China
  2. Tianjin Key Laboratory of Modern Engineering Mechanics ; 300072 ; Tianjin ; China
  3. The State Key Laboratory of Nonlinear Mechanics ; Institute of Mechanics ; Chinese Academy of Sciences ; 100190 ; Beijing ; China
  
• 关键词：Log law region in TBL ; Spatial ; temporal cross ; correlation ; Tomographic TRPIV ; Coherent structures ; Low and high speed streaks ; Multi ; resolution wavelet decomposition
• 刊名：Acta Mechanica Solida Sinica
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：31
• 期：1
• 页码：16-24
• 全文大小：737 KB
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• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics
  Mechanics, Fluids and Thermodynamics
  Engineering Fluid Dynamics
  Numerical and Computational Methods in Engineering
  Chinese Library of Science
  
• 出版者：The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of
• ISSN：1614-3116

文摘

The spatial-temporal evolution of coherent structures (CS) is significant for turbulence control and drag reduction. Among the CS, low and high speed streak structures show typical burst phenomena. The analysis was based on a time series of three-dimensional and three-component (3D-3C) velocity fields of the flat plate turbulent boundary layer (TBL) measured by a Tomographic and Time-resolved PIV (Tomo TRPIV) system. Using multi-resolution wavelet transform and conditional sampling method, we extracted the intrinsic topologies and found that the streak structures appear in bar-like patterns. Furthermore, we seized locations and velocity information of transient CS, and then calculated the propagation velocity of CS based on spatial-temporal cross-correlation scanning. This laid a foundation for further studies on relevant dynamics properties.