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A stochastic view of isotropic turbulence decay

Published online by Cambridge University Press:  26 January 2011

MARCELLO MELDI ,
PIERRE SAGAUT  and
DIDIER LUCOR
MARCELLO MELDI*
Affiliation:
DIMeC Dipartimento di Ingegneria Meccanica e Civile, Università degli studi di Modena e Reggio Emilia, 41100 Modena, Italy
PIERRE SAGAUT
Affiliation:
Institut Jean Le Rond d'Alembert, UMR 7190, 4 Place Jussieu, Case 162, Université Pierre et Marie Curie, Paris 6, F-75252 Paris CEDEX 5, France
DIDIER LUCOR
Affiliation:
Institut Jean Le Rond d'Alembert, UMR 7190, 4 Place Jussieu, Case 162, Université Pierre et Marie Curie, Paris 6, F-75252 Paris CEDEX 5, France
*
†Email address for correspondence: marcellomeldi@gmail.com
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Abstract

A stochastic eddy-damped quasi-normal Markovian (EDQNM) approach is used to investigate self-similar decaying isotropic turbulence at a high Reynolds number (400 ≤ Reλ ≤ 104). The realistic energy spectrum functional form recently proposed by Meyers & Menevau (Phys. Fluids, vol. 20, 2008, p. 065109) is generalized by considering some of the model constants as random parameters, since they escape measure in most experimental set-ups. The induced uncertainty on the solution is investigated, building response surfaces for decay power-law exponents of usual physical quantities. Large-scale uncertainties are considered, the emphasis being put on Saffman and Batchelor turbulences. The sensitivity of the solution to initial spectrum uncertainties is quantified through probability density functions of the decay exponents. It is observed that the initial spectrum shape at very large scales governs the long-time evolution, even at a high Reynolds number, a parameter which is not explicitly taken into account in many theoretical works. Therefore, a universal asymptotic behaviour in which kinetic energy decays as t−1 is not detected. However, this decay law is observed at finite Reynolds numbers with low probability for some initial conditions.

JFM classification

Turbulent Flows: Isotropic turbulence

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Type
Papers
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Journal of Fluid Mechanics , Volume 668 , 10 February 2011 , pp. 351 - 362
Copyright
Copyright © Cambridge University Press 2011

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References

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