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Title of Journal: Acta Mech Sin

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Abbravation: Acta Mechanica Sinica

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The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of Sciences

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DOI

10.1007/s10971-008-1887-9

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1614-3116

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LES prediction of spacetime correlations in turbu

Authors: Li Guo Dong Li Xing Zhang GuoWei He
Publish Date: 2012/09/07
Volume: 28, Issue: 4, Pages: 993-998
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Abstract

We compare the spacetime correlations calculated from direct numerical simulation DNS and largeeddy simulation LES of turbulent channel flows It is found from the comparisons that the LES with an eddyviscosity subgrid scale SGS model overpredicts the spacetime correlations than the DNS The overpredictions are further quantified by the integral scales of directional correlations and convection velocities A physical argument for the overprediction is provided that the eddyviscosity SGS model alone does not includes the backscatter effects although it correctly represents the energy dissipations of SGS motions This argument is confirmed by the recently developed elliptic model for spacetime correlations in turbulent shear flows It suggests that enstrophy is crucial to the LES prediction of spacetime correlations The random forcing models and stochastic SGS models are proposed to overcome the overpredictions on spacetime correlations

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