Time Correlations Of Pressure In Isotropic Turbulence

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	Time Correlations Of Pressure In Isotropic Turbulence
	Yao HD(姚华栋); He GW(何国威); Wang M; Zhang X(张星)
刊名	Physics of Fluids
	2008
通讯作者邮箱	hgw@lnm.imech.ac.cn
页码	025105(1-4)
关键词	Statistics Simulation Spectra
ISSN号	1070-6631
通讯作者	He, GW (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100080, Peoples R China.
中文摘要	The time correlations of pressure modes in stationary isotropic turbulence are investigated under the Kraichnan and Tennekes "random sweeping" hypothesis. A simple model is obtained which predicts a universal form for the time correlations. It implies that the decorrelation process of pressure fluctuations in time is mainly dominated by the sweeping velocity, and the pressure correlations have the same decorrelation time scales as the velocity correlations. These results are verified using direct numerical simulations of isotropic turbulence at two moderate Reynolds numbers; the mode correlations collapse to the universal form when the time separations are scaled by wavenumber times the sweeping velocity, and the ratios of the correlation coefficients of pressure modes to those of velocity modes are approximately unity for the entire range of time separation. (c) 2008 American Institute of Physics.
类目[WOS]	Mechanics ; Physics, Fluids & Plasmas
研究领域[WOS]	Mechanics ; Physics
关键词[WOS]	STATISTICS ; SIMULATION ; SPECTRA
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000254141600027
公开日期	2009-08-03
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/26102]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Yao HD,He GW,Wang M,et al. Time Correlations Of Pressure In Isotropic Turbulence[J]. Physics of Fluids,2008:025105(1-4).
APA	姚华栋,何国威,Wang M,&张星.(2008).Time Correlations Of Pressure In Isotropic Turbulence.Physics of Fluids,025105(1-4).
MLA	姚华栋,et al."Time Correlations Of Pressure In Isotropic Turbulence".Physics of Fluids (2008):025105(1-4).