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Journal of Turbulence Volume 7, 2006 - Issue
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Original Articles

Multi-scale analysis of near-wall turbulence intermittency

C. -X. Xu Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing, 100084, P.R. China
,
L. Li Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing, 100084, P.R. China
,
G. -X. Cui Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing, 100084, P.R. China
&
Z. -S. Zhang Department of Engineering Mechanics, School of Aerospace, Tsinghua University, Beijing, 100084, P.R. China
Article: N25 | Published online: 30 Oct 2009
 
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Two-dimensional continuous wavelet transform has been performed to the directly simulated turbulent channel flow at low Reynolds number. The scale-dependency of turbulence intermittency is studied in the near-wall region. The intermittency level in terms of flatness factors is obtained at different scales and different locations to the wall. A method to decompose the flow signals into the intermittent and the non-intermittent is proposed, and the typical intermittent structures in the near-wall region are obtained.

Acknowledgment

Projects 10472053 and 10272065 are supported by the Natural Science Foundation of China.

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