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

doi:10.1017/jfm.2019.1044

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	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
刊名	JOURNAL OF FLUID MECHANICS
	2020-03-10
卷号	886 页码:26
关键词	turbulence theory turbulence modelling turbulent boundary layers
ISSN号	0022-1120
DOI	10.1017/jfm.2019.1044
通讯作者	He, Guowei(hgw@lnm.imech.ac.cn)
英文摘要	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.
分类号	一类/力学重要期刊
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]
WOS关键词	CONVECTION VELOCITIES ; BOUNDARY-LAYER ; NUMBER
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000506871500001
资助机构	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
其他责任者	He, Guowei
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/81318]
专题	力学研究所_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.