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Roughness effects in low- Re θ open-channel turbulent boundary layers

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Abstract

This paper reports velocity measurements obtained on a smooth and two geometrically different types of rough surfaces in an open channel. The measurements were obtained using a laser-Doppler anemometer. The recent boundary layer theory proposed by George and Castillo (1997) and conventional scaling laws are used to analyze the data. The present flow shows a strong structural similarity to a canonical turbulent boundary layer in the inner layer. The results demonstrate that surface roughness increases the wake parameter. Surface roughness also enhances the levels of turbulence intensities, Reynolds shear stress and triple correlations over most of the boundary layer, but decreases the stress anisotropy.

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Acknowledgements

The support of the Natural Sciences and Engineering Research Council of Canada in the form of postgraduate scholarship to MFT and research and equipment grants to DJB and RB is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, University of Manitoba, Winnipeg, R3T 5V6, Canada

    M. F. Tachie

  2. Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, S7N 5A9, Canada

    D. J. Bergstrom

  3. Department of Civil & Environmental Engineering, University of Windsor, Windsor, 401 Sunset Ave., N9B 3P4, Canada

    R. Balachandar

Authors
  1. M. F. Tachie
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  2. D. J. Bergstrom
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  3. R. Balachandar
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Correspondence to M. F. Tachie.

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Tachie, M.F., Bergstrom, D.J. & Balachandar, R. Roughness effects in low- Re θ open-channel turbulent boundary layers. Exp Fluids 35, 338–346 (2003). https://doi.org/10.1007/s00348-003-0654-5

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  • DOI: https://doi.org/10.1007/s00348-003-0654-5

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