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Amplitude modulation and extreme events in turbulent channel flow

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Abstract

Amplitude modulation of near-wall turbulence by large-scale structures in the outer layer is investigated by direct numerical simulation of turbulent channel flows at Reynolds number \(Re_{\tau } =540\), 1000, 2000. The effect of modulation is obvious in the two-point cross-section correlation map, and the correlation coefficients increase significantly with the Reynolds number. The influence of modulation is reflected in the tail of the probability density function of the near-wall flow signals, which expands as the Reynolds number increases. The flatness factor provides a quantitative description of the high fluctuation events due to modulation. Vortical structures associated with modulation are revealed by conditionally averaging the flow field of the near-wall extreme events, providing a depiction of how the influence of the large-scale structures penetrate towards the near-wall region.

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Acknowledgements

The work was supported by the National Natural Science Foundation of China (Grants 11490551, 11472154, and 11322221).

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Authors and Affiliations

  1. AML, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China

    Y. C. Yao, W. X. Huang & C. X. Xu

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  1. Y. C. Yao
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  2. W. X. Huang
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  3. C. X. Xu
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Correspondence to C. X. Xu.

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Yao, Y.C., Huang, W.X. & Xu, C.X. Amplitude modulation and extreme events in turbulent channel flow. Acta Mech. Sin. 34, 1–9 (2018). https://doi.org/10.1007/s10409-017-0687-2

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  • DOI: https://doi.org/10.1007/s10409-017-0687-2

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