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引用
期刊论文
MULTI-SCALE COHNT STRUCTURES IN TURBULENT BOUNDARY LAYER DETECTED BY lOCALIY AVERAGED VELOCITY STRUCTURE FUNCTIONS*
Applied Mathematics and Mechanics (EneJish Edition) vol. 26 No.4 Apr. 2005,-0001,():
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 motiom 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 Hart wavelet transformation, detecting method Was presented, by which the coherent structures and their intennittency was identified by multi-scale flatness factor calculated by locally average structure function. Phase-averaged evolution course for multi-scale coherent eddy strucatres 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.
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