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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