Multi-Scale Coherent Structures in Turbulent Boundary Layer Detected by Locally Averaged Velocity Structure Functions

LIU Jian-hua; JIANG Nan; WANG Zhen-dong; SHU Wei

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Article Navigation > Applied Mathematics and Mechanics > 2005 > 26(4): 456-464

LIU Jian-hua, JIANG Nan, WANG Zhen-dong, SHU Wei. Multi-Scale Coherent Structures in Turbulent Boundary Layer Detected by Locally Averaged Velocity Structure Functions[J]. Applied Mathematics and Mechanics, 2005, 26(4): 456-464.

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Multi-Scale Coherent Structures in Turbulent Boundary Layer Detected by Locally Averaged Velocity Structure Functions

Department of Mechanics, Tianjin University, Tianjin 300072, P. R. China

Received Date: 2004-02-25
Rev Recd Date: 2004-12-24
Publish Date: 2005-04-15

Abstract

Abstract

Abstract:The time sequence of longitudinal velocity component at different vertical locations in turbulent boundary layer was finely measured in a wind tunnel.The concept of coarse-grained velocity structure functions,which describes the relative motions of straining and compressing for multi-scale eddy structures in turbulent flows,was put forward based on the theory of locally multi-scale average.Based on the consistency between coarse-grained velocity structure function and Harr wavelet transformation,detecting method was presented,by which the coherent structures and their intermittency was identified by multi-scale flatness factor calculated by locally average structure function. Phase-averaged evolution course for multi-scale coherent eddy structures in wall turbulence were extracted by this conditional sampling to educe scheme.The dynamics course of multi-scale coherent eddy structures and their effects on statistics of turbulent flows were studied.
- turbulent boundary layer,
- coherent structure,
- flatness factor,
- intermittency,
- locally averaged velocity structure function

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References(14)

References

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