On the computation of space-time correlations by large-eddy simulation

doi:10.1063/1.1779251

IMECH-IR > 力学所知识产出(1956-2008)

	On the computation of space-time correlations by large-eddy simulation
	He GW(何国威); Wang M; Lele SK; He, GW (reprint author), Stanford Univ, Ctr Turbulence Res, NASA, Ames Res Ctr, MS 19-44, Moffett Field, CA 94035 USA.
发表期刊	Physics of Fluids
	2004
卷号	16 期号:11 页码:3859-3867
ISSN	1070-6631
摘要	The effect of subgrid-scale (SGS) modeling on velocity (space-) time correlations is investigated in decaying isotropic turbulence. The performance of several SGS models is evaluated, which shows superiority of the dynamic Smagorinsky model used in conjunction with the multiscale large-eddy simulation (LES) procedure. Compared to the results of direct numerical simulation, LES is shown to underpredict the (un-normalized) correlation magnitude and slightly overpredict the decorrelation time scales. This can lead to inaccurate solutions in applications such as aeroacoustics. The underprediction of correlation functions is particularly severe for higher wavenumber modes which are swept by the most energetic modes. The classic sweeping hypothesis for stationary turbulence is generalized for decaying turbulence and used to analyze the observed discrepancies. Based on this analysis, the time correlations are determined by the wavenumber energy spectra and the sweeping velocity, which is the square root of the total energy. Hence, an accurate prediction of the instantaneous energy spectra is most critical to the accurate computation of time correlations. (C) 2004 American Institute of Physics.
关键词	Isotropic Turbulence Noise Sound Scales
DOI	10.1063/1.1779251
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000224456800006
关键词[WOS]	ISOTROPIC TURBULENCE ; NOISE ; SOUND ; SCALES
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
引用统计	被引频次：59[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/33757
专题	力学所知识产出(1956-2008)
通讯作者	He, GW (reprint author), Stanford Univ, Ctr Turbulence Res, NASA, Ames Res Ctr, MS 19-44, Moffett Field, CA 94035 USA.
推荐引用方式 GB/T 7714	He GW,Wang M,Lele SK,et al. On the computation of space-time correlations by large-eddy simulation[J]. Physics of Fluids,2004,16,11,:3859-3867.
APA	何国威,Wang M,Lele SK,&He, GW .(2004).On the computation of space-time correlations by large-eddy simulation.Physics of Fluids,16(11),3859-3867.
MLA	何国威,et al."On the computation of space-time correlations by large-eddy simulation".Physics of Fluids 16.11(2004):3859-3867.

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