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The non-equilibrium region of grid-generated decaying turbulence

Published online by Cambridge University Press:  13 March 2014

P. C. Valente  and
J. C. Vassilicos
P. C. Valente*
Affiliation:
Department of Aeronautics, Imperial College London, London SW7 2AZ, UK
J. C. Vassilicos
Affiliation:
Department of Aeronautics, Imperial College London, London SW7 2AZ, UK
*
†Present address: IDMEC/IST, University of Lisbon, 1049-001 Lisbon, Portugal. Email addresses for correspondence: pedro.cardoso.valente@ist.utl.pt, j.c.vassilicos@imperial.ac.uk
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Abstract

The previously reported non-equilibrium dissipation law is investigated in turbulent flows generated by various regular and fractal square grids. The flows are documented in terms of various turbulent profiles which reveal their differences. In spite of significant inhomogeneity and anisotropy differences, the new non-equilibrium dissipation law is observed in all of these flows. Various transverse and longitudinal integral scales are measured and used to define the dissipation coefficient $C_{\varepsilon }$. It is found that the new non-equilibrium dissipation law is not an artefact of a particular choice of the integral scale and that the usual equilibrium dissipation law can actually coexist with the non-equilibrium law in different regions of the same flow.

JFM classification

Turbulent Flows: Turbulent Flows Turbulent Flows: Turbulence theory
Type
Papers
Information
Journal of Fluid Mechanics , Volume 744 , 10 April 2014 , pp. 5 - 37
Copyright
© 2014 Cambridge University Press 

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