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Direct Numerical Simulation and PIV Measurement of Turbulent Boundary Layer over a Rod-Roughened Wall

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IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls

Part of the book series: IUTAM Bookseries ((IUTAMBOOK,volume 22))

Abstract

The effects of surface roughness on a spatially-developing turbulent boundary layer were investigated by performing direct numerical simulation and particle image velocimetry measurements of TBLs over rough and smooth walls. Introduction of the roughness elements augmented turbulent stresses in the region of y< 4 ∼ 5k s , where k s is an effective sand roughness height. However, the roughness has little effect on the vorticity fluctuations, turbulent kinetic energy budget and quadratic components of Reynolds shear stress in the outer layer. We also demonstrate the modification of coherent vortical structures over the rod-roughened wall by using linear stochastic estimation.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1, Guseong-dong, Yuseong-Gu, Daejeon, 305-701, Korea

    Seung-Hyun Lee, Jae Hwa Lee & Hyung Jin Sung

Authors
  1. Seung-Hyun Lee
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  2. Jae Hwa Lee
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  3. Hyung Jin Sung
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Corresponding author

Correspondence to Hyung Jin Sung .

Editor information

Editors and Affiliations

  1. Dept. Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, United Kingdom

    T. B. Nickels

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Lee, SH., Lee, J.H., Sung, H.J. (2010). Direct Numerical Simulation and PIV Measurement of Turbulent Boundary Layer over a Rod-Roughened Wall. In: Nickels, T. (eds) IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls. IUTAM Bookseries, vol 22. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9631-9_1

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  • DOI: https://doi.org/10.1007/978-90-481-9631-9_1

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  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-9630-2

  • Online ISBN: 978-90-481-9631-9

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