Abstract
The longitudinal fluctuating velocity of a turbulent boundary layer was measured in a water channel at a moderate Reynolds number. The extended self-similar scaling law of structure function proposed by Benzi was verified. The longitudinal fluctuating velocity in the turbulent boundary layer was decomposed into many multi-scale eddy structures by wavalet transform. The extended self-similar scaling law of structure function for each scale eddy velocity was investigated. The conclusions are 1) The statistical properties of turbulence could be self-similar not only at high Reynolds number, but also at moderate and low Reynolds number, and they could be characterized by the same set of scaling exponents ζ1(n)=n/3 and ζ2(n)=n/3 of the fully developed regine. 2) The range of scales where the extended self-similarity valid is much larger than the inertial range and extends far deep into the dissipation range with the same set of scaling exponents. 3) The extended self-similarity is applicable not only for homogeneous turbulence, but also for shear turbulence such as turbulent boundary layers.
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References
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Communicated by Li Jia-chun
Foundation item: the National Natural Science Foundation of China (19732005); Doctoral Program Foundation of the Education Committee of China (97005612); the National Climbing Profect
Biogrphy: JIANG Nan (1968∼)
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Nan, J., Zhen-dong, W. & Wei, S. Extended self-similar scaling law of multi-scale eddy structure in wall turbulence. Appl Math Mech 21, 1016–1023 (2000). https://doi.org/10.1007/BF02459311
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DOI: https://doi.org/10.1007/BF02459311