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On the use of the Reynolds decomposition in the intermittent region of turbulent boundary layers

Published online by Cambridge University Press:  30 March 2016

Y. S. Kwon ,
N. Hutchins  and
J. P. Monty
Y. S. Kwon*
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria 3010, Australia
N. Hutchins
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria 3010, Australia
J. P. Monty
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria 3010, Australia
*
†Email address for correspondence: kwon@unimelb.edu.au
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Abstract

In the analysis of velocity fields in turbulent boundary layers, the traditional Reynolds decomposition is universally employed to calculate the fluctuating component of streamwise velocity. Here, we demonstrate the perils of such a determination of the fluctuating velocity in the context of structural analysis of turbulence when applied in the outer region where the flow is intermittently turbulent at a given wall distance. A new decomposition is postulated that ensures non-turbulent regions in the flow do not contaminate the fluctuating velocity components in the turbulent regions. Through this new decomposition, some of the typical statistics concerning the scale and structure of turbulent boundary layers are revisited.

JFM classification

Turbulent Flows: Turbulent boundary layers Turbulent Flows: Turbulent Flows

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 794 , 10 May 2016 , pp. 5 - 16
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Copyright
© 2016 Cambridge University Press 

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