Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows

doi:10.1017/jfm.2019.1044

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	Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows
	Wu T(吴霆)1; He GW(何国威)1,2
通讯作者	He, Guowei(hgw@lnm.imech.ac.cn)
发表期刊	JOURNAL OF FLUID MECHANICS
	2020-03-10
卷号	886 页码:26
ISSN	0022-1120
摘要	A statistical model is developed to reconstruct space-time energy spectra in turbulent flows from a non-extensive dataset comprising a time series of velocity fluctuations at a finite number of measurement points. This model is based on a higher approximation of energetic flow structures and developed by using local modulated waves. As a result, it can correctly predict the mean wavenumbers and spectral bandwidths. In contrast, Taylor's frozen-flow hypothesis incorrectly predicts the spectral bandwidths to be zero, and the local wavenumber model significantly under-predicts the spectral bandwidths. An analytical example is formulated to illustrate the present model, and datasets from direct numerical simulations of turbulent channel flows are used to validate this model. The present statistical model is also discussed in terms of the dominating processes of temporal decorrelation in turbulent flows.
关键词	turbulence theory turbulence modelling turbulent boundary layers
DOI	10.1017/jfm.2019.1044
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000506871500001
关键词[WOS]	CONVECTION VELOCITIES ; BOUNDARY-LAYER ; NUMBER
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics'[11988102] ; National Natural Science Foundation of China[11232011] ; National Natural Science Foundation of China[11572331] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040104] ; Strategic Priority Research Program of the Chinese Academy of Sciences[QYZDJ-SSW-SYS002] ; Key Research Program of Frontier Science of the Chinese Academy of Sciences[QYZDJ-SSW-SYS002]
项目资助者	NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics' ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Key Research Program of Frontier Science of the Chinese Academy of Sciences
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	He, Guowei
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/311007/81319
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wu T,He GW. Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows[J]. JOURNAL OF FLUID MECHANICS,2020,886:26.
APA	吴霆,&何国威.(2020).Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows.JOURNAL OF FLUID MECHANICS,886,26.
MLA	吴霆,et al."Local modulated wave model for the reconstruction of space-time energy spectra in turbulent flows".JOURNAL OF FLUID MECHANICS 886(2020):26.

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