A closure theory of intermittency of turbulence

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	A closure theory of intermittency of turbulence
	Qian J
刊名	Physics of Fluids
	1986
卷号	29 期号:7 页码:2165-2171
ISSN号	1070-6631
中文摘要	The variational approach to the closure problem of turbulence theory, proposed in an earlier article [Phys. Fluids 26, 2098 (1983); 27, 2229 (1984)], is extended to evaluate the flatness factor, which indicates the degree of intermittency of turbulence. Since the flatness factor is related to the fourth moment of a turbulent velocity field, the corresponding higher-order terms in the perturbation solution of the Liouville equation have to be considered. Most closure methods discard these higher-order terms and fail to explain the intermittency phenomenon. The computed flatness factor of the idealized model of infinite isotropic turbulence ranges from 9 to 15 and has the same order of magnitude as the experimental data of real turbulent flows. The intermittency phenomenon does not necessarily negate the Kolmogorov k−5/3 inertial range spectrum. The Kolmogorov k−5/3 law and the high degree of intermittency can coexist as two consistent consequences of the closure theory of turbulence. The Kolmogorov 1941 theory [J. Fluid Mech. 62, 305 (1974)] cannot be disqualified merely because the energy dissipation rate fluctuates.
类目[WOS]	Mechanics ; Physics, Fluids & Plasmas
研究领域[WOS]	Mechanics ; Physics
收录类别	SCI
语种	英语
WOS记录号	WOS:A1986D218500021
公开日期	2009-08-03 ; 2010-08-20
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/39772]
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	Qian J. A closure theory of intermittency of turbulence[J]. Physics of Fluids,1986,29(7):2165-2171.
APA	Qian J.(1986).A closure theory of intermittency of turbulence.Physics of Fluids,29(7),2165-2171.
MLA	Qian J."A closure theory of intermittency of turbulence".Physics of Fluids 29.7(1986):2165-2171.