A closure theory of intermittency of turbulence

doi:10.1063/1.865553

IMECH-IR > 力学所知识产出(1956-2008)

	A closure theory of intermittency of turbulence
	Qian J
发表期刊	Physics of Fluids
	1986
卷号	29 期号:7 页码:2165-2171
ISSN	1070-6631
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.
DOI	10.1063/1.865553
收录类别	SCI
语种	英语
WOS记录号	WOS:A1986D218500021
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
引用统计	被引频次：11[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/311007/39772
专题	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.

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