Scaling Exponents in Fully Developed Asymmetric Channel Flow

JIANG Jian-bo; QIU Xiang; LU Zhi-ming; LIU Yu-lu

Volume 26 Issue 3

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Article Navigation > Applied Mathematics and Mechanics > 2005 > 26(3): 267-273

JIANG Jian-bo, QIU Xiang, LU Zhi-ming, LIU Yu-lu. Scaling Exponents in Fully Developed Asymmetric Channel Flow[J]. Applied Mathematics and Mechanics, 2005, 26(3): 267-273.

Citation:

JIANG Jian-bo, QIU Xiang, LU Zhi-ming, LIU Yu-lu. Scaling Exponents in Fully Developed Asymmetric Channel Flow[J]. Applied Mathematics and Mechanics, 2005, 26(3): 267-273.

Citation:

JIANG Jian-bo, QIU Xiang, LU Zhi-ming, LIU Yu-lu. Scaling Exponents in Fully Developed Asymmetric Channel Flow[J]. Applied Mathematics and Mechanics, 2005, 26(3): 267-273.

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Scaling Exponents in Fully Developed Asymmetric Channel Flow

Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, P. R. China

Received Date: 2003-09-02
Rev Recd Date: 2004-12-03
Publish Date: 2005-03-15

Abstract

Abstract

Wavelet analysis is applied to study the global and local scaling exponents in fully developed asymmetric channel flow. Global exponents are calculated by orthogonal wavelets and Extended Scaling Similarity(ESS). The results show that the flow in an asymmetric channel flow exhibits different characteristics of intermittence from that in a symmetric flow. It is also shown that the intermittence property of the streamwise fluctuations is different from that of vertical fluctuations, and the intermittence does not decay with the increase of the distance from the wall. In addition, the Continuous Wavelet Transform(CWT) method is found to be unreliable to calculate the local scaling components. Finally, it is pointed out that the existence and the significance of negative local scaling components need further study.
- turbulent counter-gradient-transport(CGT),
- scaling exponent,
- wavelet analysis

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References(20)

References

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