Stochastic dynamical model for space-time energy spectra in turbulent shear flows

doi:10.1103/PhysRevFluids.6.054602

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

	Stochastic dynamical model for space-time energy spectra in turbulent shear flows
	Wu, Ting 1,2; He, Guowei 1,2
刊名	PHYSICAL REVIEW FLUIDS
	2021-05-06
卷号	6 期号:5 页码:23
ISSN号	2469-990X
DOI	10.1103/PhysRevFluids.6.054602
通讯作者	He, Guowei(hgw@lnm.imech.ac.cn)
英文摘要	Space-time energy spectra describe the distribution of energy density over space and timescales, which are fundamental to studying dynamic coupling at spatial and temporal scales and turbulence-generated noise. The present paper develops a dynamic autoregressive (DAR) random forcing model for space-time energy spectra in turbulent shear flows. This model includes the two essential mechanisms of statistical decorrelation: the convection proposed by Taylor's model and the random sweeping proposed by the Kraichnan-Tennekes model. The new development is that DAR random forcing is introduced to represent the random sweeping effect. The resulting model can correctly reproduce the convection velocity and spectral bandwidths, while a white-in-time random forcing model makes erroneous predictions on spectral bandwidths. The DAR model is further combined with linear stochastic estimation (LSE) to reconstruct the near-wall velocity fluctuations of the desired space-time energy spectra. Direct numerical simulation of turbulent channel flows is used to validate the DAR model and evaluate the Werner-Wengle wall model and the LSE approach. Both the wall model and LSE incorrectly estimate the spectral bandwidths.
资助项目	NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; National Natural Science Foundation of China[12002344] ; National Natural Science Foundation of China[11232011] ; National Natural Science Foundation of China[11572331] ; China Postdoctoral Science Foundation[2020M670478] ; Strategic Priority Research Program[XDB22040104] ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences[QYZDJ-SSW-SYS002]
WOS关键词	SPATIOTEMPORAL SPECTRA ; AMPLIFICATION ; LAYER
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000652861900002
资助机构	NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; Strategic Priority Research Program ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/86714]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	He, Guowei
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Wu, Ting,He, Guowei. Stochastic dynamical model for space-time energy spectra in turbulent shear flows[J]. PHYSICAL REVIEW FLUIDS,2021,6(5):23.
APA	Wu, Ting,&He, Guowei.(2021).Stochastic dynamical model for space-time energy spectra in turbulent shear flows.PHYSICAL REVIEW FLUIDS,6(5),23.
MLA	Wu, Ting,et al."Stochastic dynamical model for space-time energy spectra in turbulent shear flows".PHYSICAL REVIEW FLUIDS 6.5(2021):23.