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Velocity autocorrelations of decaying isotropic homogeneous turbulence

 

作者: Mei‐Jiau Huang,   Anthony Leonard,  

 

期刊: Physics of Fluids  (AIP Available online 1995)
卷期: Volume 7, issue 10  

页码: 2455-2464

 

ISSN:1070-6631

 

年代: 1995

 

DOI:10.1063/1.868780

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Velocity autocorrelations and the mean‐square displacements of fluid particles are obtained for decaying, isotropic homogeneous turbulence by numerical simulation of the flow field, using 1283and 2563grids, and tracking several tens of thousands of fluid particles, using a third‐order interpolation scheme. A self‐preserving Lagrangian velocity autocorrelation coefficient is found in terms of a dimensionless time variables, defined byds=dt/Ts(t), under the observation of a power‐law energy decay and the assumption thatTs(t) is proportional to the Lagrangian integral timescaleTL. This timescale is in turn assumed to be proportional to the length scale of the energy‐containing eddiesLe∼K3/2/&egr; divided by the turbulent velocityu′, whereK=3/2u′2is turbulent energy and &egr; is the energy dissipation rate. ©1995 American Institute of Physics. 

 

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