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The Mesolayer and Reynolds Number Dependencies of Boundary Layer Turbulence

  • William K. George
  • Murat Tutkun
Part of the ERCOFTAC Series book series (ERCO, volume 14)

Abstract

Spectral measurements from the WALLTURB Lille experiment in a flat plate turbulent boundary layer at R θ =19,100 are used to evaluate the role of viscosity on the turbulence in different parts of the boundary layer. The measurements support the idea of a mesolayer from 30≤y +≤300 in which viscosity affects all scales of motion. An approximately k−1 range emerges near the outer part of the mesolayer and over inertial sublayer (220≤y +≤890). But in spite of the relatively high value of R θ , the spectra in neither the inertial sublayer (300≤y +≤0.1δ 0.99) nor the main part of the boundary layer show a true inertial subrange behavior; i.e., a k−5/3 spectrum. The spectra outside of \(y^{+}\approx 0.12\delta_{99}^{+}\) were shown to be consistent with a k−5/3+μ behavior where μ>0 and decreases as the inverse of the logarithm of the Reynolds number. An immediate consequence is that the asymptotic state of the boundary layer can be reached only at very high values of R θ , probably near 105.

Keywords

Boundary Layer Reynolds Number Reynolds Shear Stress Dissipative Scale Inertial Subrange 
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.

Notes

Acknowledgements

This work has been performed under the WALLTURB project. WALLTURB (A European synergy for the assessment of wall turbulence) is funded by the CEC under the 6th framework program (CONTRACT No: AST4-CT-2005-516008).

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Dept. of Applied MechanicsChalmers University of TechnologyGothenburgSweden
  2. 2.Norwegian Defence Research Establishment (FFI)KjellerNorway

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