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Bottom wall shear stress fluctuations in shallow-water Langmuir turbulence

文献类型：期刊论文

作者Deng, Bing-Qing3; Yang, Zixuan2; Shen, Lian1,3
刊名JOURNAL OF FLUID MECHANICS
出版日期2022-05-13
卷号942页码:38
关键词turbulent boundary layers wave-turbulence interactions
ISSN号0022-1120
DOI10.1017/jfm.2022.343
通讯作者Shen, Lian(shen@umn.edu)
英文摘要In neutrally stratified shallow water, full-depth Langmuir cells (LCs) can interact with the turbulent benthic boundary layer and, thus, influence bottom wall shear stresses. In this paper the impacts of full-depth LCs on the streamwisc and spanwise wall shear stresses are systematically studied using the database obtained from wall-resolved large-eddy simulation of shallow-water Langmuir turbulence. Analyses focus on the instantaneous wall shear stress fluctuations and the joint probability density functions between the stress fluctuations and the LCs parts of the velocity fluctuations, which show that the linear superimposition effect and nonlinear modulation effect of LCs are responsible for the spanwise organized distribution of wall shear stress fluctuations. Compared with the statistics in pure shear-driven turbulence without LCs, the mean square values of wall shear stress fluctuations in shallow-water Langmuir turbulence are enhanced by the strong linear superimposition effect of LCs, while the skewness and kurtosis are reduced by the combination of the linear superimposition effect and nonlinear modulation effect of LCs. Based on the scalings of these effects, a new predictive model of wall shear stress fluctuations is proposed for shallow-water Langmuir turbulence. The proposed model can predict the spatial distribution and statistics of wall shear stress fluctuations using the LCs parts of velocity fluctuations measured above the water bottom. Owing to the persistence of the spanwise inhomogeneity of wall shear stresses induced by full-depth I,Cs, the new predictive model will be useful for improving the wall-layer modelling for shallow-water Langmuir turbulent flows.
WOS关键词CHANNEL FLOW ; AMPLITUDE-MODULATION ; SCALE STRUCTURES ; BOUNDARY-LAYER ; SIMULATIONS ; PRESSURE ; WIND
资助项目Office of Naval Research ; National Science Foundation ; Minnesota Sea Grant
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:000794377900001
资助机构Office of Naval Research ; National Science Foundation ; Minnesota Sea Grant
源URL[http://dspace.imech.ac.cn/handle/311007/89372]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Shen, Lian
作者单位1.Univ Minnesota, Dept Mech Engn, Minneapolis, MN 55455 USA
2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
3.Univ Minnesota, St Anthony Falls Lab, Minneapolis, MN 55414 USA
推荐引用方式
GB/T 7714		 Deng, Bing-Qing,Yang, Zixuan,Shen, Lian. Bottom wall shear stress fluctuations in shallow-water Langmuir turbulence[J]. JOURNAL OF FLUID MECHANICS,2022,942:38.
APA Deng, Bing-Qing,Yang, Zixuan,&Shen, Lian.(2022).Bottom wall shear stress fluctuations in shallow-water Langmuir turbulence.JOURNAL OF FLUID MECHANICS,942,38.
MLA Deng, Bing-Qing,et al."Bottom wall shear stress fluctuations in shallow-water Langmuir turbulence".JOURNAL OF FLUID MECHANICS 942(2022):38.

入库方式： OAI收割

来源：力学研究所

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