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Longitudinal vortices imbedded in turbulent boundary layers. Part 1. Single vortex

Published online by Cambridge University Press:  20 April 2006

I. M. M. A. Shabaka ,
R. D. Mehta  and
P. Bradshaw
I. M. M. A. Shabaka
Affiliation:
Department of Aeronautics, Imperial College, London Present address: Dept of Aero. Engng, Cairo University
R. D. Mehta
Affiliation:
Department of Aeronautics, Imperial College, London Present address: Dept. of Aero. and Astro., Stanford University, CA.
P. Bradshaw
Affiliation:
Department of Aeronautics, Imperial College, London
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Abstract

Detailed mean-flow and turbulence measurements have been made in a low-speed turbulent boundary layer in zero pressure gradient with an isolated, artificially generated vortex imbedded in it. The vortex was generated by a half-delta wing on the floor of the wind-tunnel settling chamber, so that the vortex entering the working section had the same circulation as that originally generated, while axial-component velocity variations were very much reduced, relative to the local mean velocity, from values just behind the generator. The measurements show that the circulation around the vortex imbedded in the boundary layer is almost conserved, being reduced only by the spanwise-component surface shear stress. Therefore the region of flow affected by the vortex continues to grow downstream, its cross-sectional dimensions being roughly proportional to the local boundary-layer thickness. The behaviour of the various components of eddy viscosity, deduced from measured Reynolds stresses, and of the various triple products, suggests that the simple empirical correlations for these quantities used in present-day turbulence models are not likely to yield flow predictions which are accurate in detail.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 155 , June 1985 , pp. 37 - 57
Copyright
© 1985 Cambridge University Press

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