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

Xiao-Bo Zheng; Nan Jiang

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

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摘要

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.

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《力学学报：英文版》 |2015年第001期|16-24|共9页
作者
Xiao-Bo Zheng; Nan Jiang;
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作者单位

Department of Mechanics,Tianjin University, 300072 Tianjin, China;

Department of Mechanics,Tianjin University, 300072 Tianjin, China;

Tianjin Key Laboratory of Modern Engineering Mechanics,300072 Tianjin, China;

The State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics, Chinese Academy of Sciences,100190 Beijing, China;

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

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