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Break-away separation for high turbulence intensity and large Reynolds number

Published online by Cambridge University Press:  22 February 2011

B. SCHEICHL ,
A. KLUWICK  and
F. T. SMITH
B. SCHEICHL*
Affiliation:
Institute of Fluid Mechanics and Heat Transfer, Vienna University of Technology, Resselgasse 3/E322, A-1040 Vienna, Austria AC2T Research GmbH, Austrian Center of Competence for Tribology, Viktor Kaplan-Straße 2, A-2700 Wiener Neustadt, Austria
A. KLUWICK
Affiliation:
Institute of Fluid Mechanics and Heat Transfer, Vienna University of Technology, Resselgasse 3/E322, A-1040 Vienna, Austria
F. T. SMITH
Affiliation:
Department of Mathematics, University College London, Gower Street, London WC1E 6BT, UK
*
†Email address for correspondence: bernhard.scheichl@tuwien.ac.at
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Abstract

Massive flow separation from the surface of a plane bluff obstacle in an incompressible uniform stream is addressed theoretically for large values of the global Reynolds number Re. The analysis is motivated by a conclusion drawn from recent theoretical results which is corroborated by experimental findings but apparently contrasts with common reasoning: the attached boundary layer extending from the front stagnation point to the position of separation never attains a fully developed turbulent state, even for arbitrarily large Re. Consequently, the boundary layer exhibits a certain level of turbulence intensity that is linked with the separation process, governed by local viscous–inviscid interaction. Eventually, the latter mechanism is expected to be associated with rapid change of the separating shear layer towards a fully developed turbulent one. A self-consistent flow description in the vicinity of separation is derived, where the present study includes the predominantly turbulent region. We establish a criterion that acts to select the position of separation. The basic analysis here, which appears physically feasible and rational, is carried out without needing to resort to a specific turbulence closure.

JFM classification

Boundary Layers: Boundary layer separation Boundary Layers: Boundary Layers Turbulent Flows: Turbulent Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 670 , 10 March 2011 , pp. 260 - 300
Copyright
Copyright © Cambridge University Press 2011

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References

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