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LDV Measurement Near a Rough Surface for a Turbulent Boundary Layer

  • Takatsugu Kameda
  • Shinsuke Mochizuki
  • Hideo Osaka
Conference paper
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 22)

Abstract

LDV(Laser Doppler Velocimeter) measurement has been made close to a rough surface beneath an equilibrium boundary layer. The experiments were conducted at the momentum thickness Reynolds number of 6,000 and the roughness Reynolds number of 150. The local skin friction coefficient can be represented as the sum of the mean flow momentum flux and the Reynolds shear stress at the top surface between the roughness elements. The moment centroid of the drag acting on the rough surface measured from the top of the roughness element might be represented as the integral length scale on both the mean flow momentum flux and Reynolds shear stress estimated in the cavity between the roughness elements. The integral length scales of the mean flow momentum flux and the Reynolds shear stress contribute 30% and 70% respectively to the moment centroid.

Keywords

Tracer Particle Roughness Element Reynolds Shear Stress Integral Length Scale Pressure Drag 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    A.S. Thom, Momentum absorption by vegetation. Quart. J. R. Met. Soc. 7, 414–428 (1971)CrossRefGoogle Scholar
  2. 2.
    P.S. Jackson, On the displacement height in the logarithmic velocity profile. J.Fluid Mech. 111, 15–25 (1981)zbMATHCrossRefGoogle Scholar
  3. 3.
    S. Leonardi, P. Orlandi, R.A. Antonia, Properties of d- and k-type roughness in a turbulent channel Flow. Phys. Fluids. 19, 125101 (2007)CrossRefGoogle Scholar
  4. 4.
    J.C. Rotta, Turbulent boundary layer in incompressible flow, 2nd edn. (Pergamon, 1962)Google Scholar
  5. 5.
    T. Kameda, S. Mochizuki, H. Osaka, realization of the turbulent boundary layer over the rough wall satisfied the conditions of complete similarity and its mean flow quantities. J. Fluid Sci. Tech. 3(1), 31–42 (2008)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Takatsugu Kameda
    • 1
  • Shinsuke Mochizuki
    • 1
  • Hideo Osaka
    • 2
  1. 1.Graduate School of Science and EngineeringYamaguchi UniversityYamaguchiJapan
  2. 2.Hiroshima Institute of TechnologyHiroshimaJapan

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