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Experimental measurement of large-scale three-dimensional structures in a turbulent boundary layer. Part 2. Long structures

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

Three-dimensional (3D) measurements of a turbulent boundary layer have been made using high-speed particle image velocimetry (PIV) coupled with Taylor's hypothesis, with the objective of characterising the very long streamwise structures that have been observed previously. The measurements show the 3D character of both low- and high-speed structures over very long volumes. The statistics of these structures are considered, as is their relationship to the important turbulence quantities. In particular, the length of the structures and their wall-normal extent have been considered and their relationship to the other components of the velocity fluctuations and the instantaneous stress.

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. 218 - 244
Copyright
Copyright © Cambridge University Press 2011

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