Non-classical/Exponential Decay Regimes in Multiscale Generated Isotropic Turbulence

M Meldi,P Sagaut

doi:10.1007/978-3-319-41217-7_22

Non-classical/Exponential Decay Regimes in Multiscale Generated Isotropic Turbulence

M Meldi, P Sagaut

https://doi.org/10.1007/978-3-319-41217-7_22

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Publication Date: Aug 31, 2016

Affiliation: French National Centre for Scientific Research, Institut Pprime, École Nationale Supérieure de Mécanique et d'Aérotechnique, University of Poitiers, Centrale Marseille, Aix-Marseille University

#Eddy-damped Quasi-normal Markovian Model #Eddy-damped Quasi-normal Markovian + Show 8 more

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Abstract

The effects of time-lasting initial production mechanisms in homogeneous isotropic turbulence (HIT) decay are here investigated by the use of an eddy-damped quasi-normal Markovian (EDQNM) model. The statistical properties of these effects are included in the EDQNM model by the use of an ad-hoc term which mimics the turbulent energy production in grid turbulence experiments. This new version of the EDQNM model has been recently proposed by Meldi et al. (J Fluid Mech 756:816–843, 2014). The sensitivity to the two model parameters β and α has been investigated. The parameters determine the shape of the forcing term in the spectral domain and its time evolution, respectively.

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