IMECH-IR  > 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
Corresponding AuthorHe, Guowei(hgw@lnm.imech.ac.cn)
Source PublicationJOURNAL OF FLUID MECHANICS
2020-03-10
Volume886Pages:26
ISSN0022-1120
AbstractA 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.
Keywordturbulence theory turbulence modelling turbulent boundary layers
DOI10.1017/jfm.2019.1044
Indexed BySCI ; EI
Language英语
WOS IDWOS:000506871500001
WOS KeywordCONVECTION VELOCITIES ; BOUNDARY-LAYER ; NUMBER
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
Funding ProjectNSFC 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]
Funding OrganizationNSFC 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
Classification一类/力学重要期刊
Ranking1
ContributorHe, Guowei
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/81319
Collection非线性力学国家重点实验室
Affiliation1.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
Recommended Citation
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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