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Experimental measurement of large-scale three-dimensional structures in a turbulent boundary layer. Part 1. Vortex packets

Published online by Cambridge University Press:  14 March 2011

DAVID J. C. DENNIS  and
TIMOTHY B. NICKELS
DAVID J. C. DENNIS*
Affiliation:
Department of Engineering, Cambridge University, Trumpington Street, Cambridge CB2 1PZ, UK
TIMOTHY B. NICKELS
Affiliation:
Department of Engineering, Cambridge University, Trumpington Street, Cambridge CB2 1PZ, UK
*
†Email address for correspondence: [email protected]
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Abstract

Experimental measurements of the three-dimensional (3D) velocity field in a moderate Reynolds number zero pressure-gradient boundary layer are presented. The measurements are analysed to produce 3D correlations and conditional averaging techniques are used to further elucidate the underlying structure. The results show clear evidence of vortex-packet-type structures and shed new light on the detailed 3D structure of such packets in a real zero pressure-gradient boundary layer.

JFM classification

Boundary Layers: Boundary Layers Boundary Layers: Boundary layer structure Turbulent Flows: Turbulent boundary layers
Type
Papers
Information
Journal of Fluid Mechanics , Volume 673 , 25 April 2011 , pp. 180 - 217
Copyright
Copyright © Cambridge University Press 2011

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