Localizing effect of Langmuir circulations on small-scale turbulence in shallow water
文献类型：期刊论文
| 作者 | Deng BQ2,3; Yang ZX(杨子轩)1,2,3; Xuan AQ2,3; Shen L2,3 |
| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2020-06-25 |
| 卷号 | 893页码:38 |
| 关键词 | turbulence simulation wave-turbulence interactions turbulent boundary layers |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2020.215 |
| 通讯作者 | Shen Lian(shen@umn.edu) |
| 英文摘要 | Wall-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. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | SURFACE BOUNDARY-LAYER ; LARGE-EDDY SIMULATION ; AMPLITUDE-MODULATION ; OCEAN ; WIND ; SUPERCELLS ; FLOW ; ENERGETICS ; MECHANISM ; DYNAMICS |
| 资助项目 | Office of Naval Research ; Minnesota Sea Grant ; National Science Foundation |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000526359400001 |
| 资助机构 | Office of Naval Research ; Minnesota Sea Grant ; National Science Foundation |
| 其他责任者 | Shen Lian |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/81876]  |
| 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, Beijing 100190, Peoples R China 2.Univ Minnesota, St Anthony Falls Lab, Minneapolis, MN 55414 USA; 3.Univ Minnesota, Dept Mech Engn, Minneapolis, MN 55414 USA; |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：力学研究所
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