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Localizing effect of Langmuir circulations on small-scale turbulence in shallow water
Deng BQ1,2; Yang ZX(杨子轩)1,2,3; Xuan AQ1,2; Shen L1,2
Corresponding AuthorShen Lian(shen@umn.edu)
Source PublicationJOURNAL OF FLUID MECHANICS
2020-06-25
Volume893Pages:38
ISSN0022-1120
AbstractWall-resolved and wall-modelled large-eddy simulations are performed to study the localizing effect of Langmuir cells (LCs) on small-scale background turbulence in shallow water. The total velocity fluctuations are decomposed into an LC content extracted by streamwise averaging and a background turbulence part. Based on the large-scale motions of LCs, the spanwise domain is divided into three regions dominated by the upwelling, spanwise and downwelling flows of LCs, respectively. The localized Reynolds stresses in different spanwise regions are compared to show the localizing effects of the LCs on the background turbulence quantitatively, where (or ), (or ) and (or ) represent the streamwise, vertical and spanwise components of the background turbulence velocity, respectively, and denotes time and streamwise averaging. It is shown that the magnitudes of the localized Reynolds stresses in different spanwise regions vary significantly. The transport equations of the localized Reynolds stresses are then analysed to investigate the mechanisms underlying the localizing effects. It is discovered that the difference in the energy production correlated to the shear of the LC content among different regions is the key factor that leads to the localization of background turbulence. In addition, the energy production correlated to the shear of the mean flow, the energy redistribution due to the pressure-strain correlation, and the interaction between the localized Reynolds stresses and the shear of the Stokes drift also play important roles. Based on the results obtained from the analysis of the transport equations, predictive models are proposed for the localizing effects, which assess the spatial dependence of the Boussinesq model for background turbulence in coastal Langmuir turbulence. These models show good scaling performance of near the water bottom and of , and in the central region of the water column under various flow conditions with different values of the Reynolds number, turbulent Langmuir number and wavenumber.
Keywordturbulence simulation wave-turbulence interactions turbulent boundary layers
DOI10.1017/jfm.2020.215
Indexed BySCI ; EI
Language英语
WOS IDWOS:000526359400001
WOS KeywordSURFACE BOUNDARY-LAYER ; LARGE-EDDY SIMULATION ; AMPLITUDE-MODULATION ; OCEAN ; WIND ; SUPERCELLS ; FLOW ; ENERGETICS ; MECHANISM ; DYNAMICS
WOS Research AreaMechanics ; Physics
WOS SubjectMechanics ; Physics, Fluids & Plasmas
Funding ProjectOffice of Naval Research ; Minnesota Sea Grant ; National Science Foundation
Funding OrganizationOffice of Naval Research ; Minnesota Sea Grant ; National Science Foundation
Classification一类/力学重要期刊
Ranking2
ContributorShen Lian
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/81877
Collection非线性力学国家重点实验室
Affiliation1.Univ Minnesota, Dept Mech Engn, Minneapolis, MN 55414 USA;
2.Univ Minnesota, St Anthony Falls Lab, Minneapolis, MN 55414 USA;
3.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Deng BQ,Yang ZX,Xuan AQ,et al. Localizing effect of Langmuir circulations on small-scale turbulence in shallow water[J]. JOURNAL OF FLUID MECHANICS,2020,893:38.
APA Deng BQ,杨子轩,Xuan AQ,&Shen L.(2020).Localizing effect of Langmuir circulations on small-scale turbulence in shallow water.JOURNAL OF FLUID MECHANICS,893,38.
MLA Deng BQ,et al."Localizing effect of Langmuir circulations on small-scale turbulence in shallow water".JOURNAL OF FLUID MECHANICS 893(2020):38.
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