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Study on local topology model of low/high streak structures in wall-bounded turbulence by tomographic time-resolved particle image velocimetry

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Abstract

The relationship between the bursting event and the low/high-speed streak in the logarithmic law (log-law) region of a turbulent boundary layer is investigated. A tomographic time-resolved particle image velocimetry (TRPIV) system is used to measure the instantaneous three-dimensional-three-component (3D-3C) velocity field. The momentum thickness based Reynolds number is about 2 460. The topological information in the log-law region is obtained experimentally. It is found that the existence of the quadrupole topological structure implies a three-pair hairpin-like vortex packet, which is in connection with the low/high-speed streak. An idealized 3D topological model is then proposed to characterize the observed hairpin vortex packet and low/high-speed streak.

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Authors and Affiliations

  1. Department of Mechanics, Tianjin University, Tianjin, 300072, China

    Haiping Tian, Nan Jiang & Shaoqiong Yang

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

    Yongxiang Huang

Authors
  1. Haiping Tian
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  2. Nan Jiang
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  3. Yongxiang Huang
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  4. Shaoqiong Yang
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Corresponding author

Correspondence to Shaoqiong Yang.

Additional information

Project supported by the National Natural Science Foundation of China (Nos. 1332006, 11272233, 11202122, and 11411130150) and the National Fundamental Research Program of China (973 Program) (No. 2012CB720101)

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Tian, H., Jiang, N., Huang, Y. et al. Study on local topology model of low/high streak structures in wall-bounded turbulence by tomographic time-resolved particle image velocimetry. Appl. Math. Mech.-Engl. Ed. 36, 1121–1130 (2015). https://doi.org/10.1007/s10483-015-1978-6

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  • DOI: https://doi.org/10.1007/s10483-015-1978-6

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