Reynolds number effect on statistics of turbulent flows over periodic hills
文献类型：期刊论文
| 作者 | Zhou, Zhideng1,2; Wu, Ting1,2; Yang, Xiaolei1,2; Yang XL(杨晓雷)
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| 刊名 | PHYSICS OF FLUIDS
 |
| 出版日期 | 2021-10-01 |
| 卷号 | 33期号:10页码:28 |
| ISSN号 | 1070-6631 |
| DOI | 10.1063/5.0062786 |
| 通讯作者 | Yang, Xiaolei(xyang@imech.ac.cn) |
| 英文摘要 | The wall-resolved large-eddy simulations of turbulent flows over periodic hills are carried out to study the Reynolds number effect on flow statistics. Five different Reynolds numbers ranging from 2800 to 37 000 are considered. The present simulations are validated by comparing the time-averaged flow statistics with those from the literature. The Reynolds number effect is first examined on the skin friction and pressure coefficients, the isosurfaces of p & PRIME; and Q criteria, and the vertical profiles of flow statistics. The results show that (1) at most locations the magnitude of friction coefficient decreases with the increase in Reynolds number, while the pressure coefficient varies in the opposite direction; (2) smaller turbulence structures arise at higher Reynolds numbers; and (3) the mean velocities and Reynolds stresses in general exhibit asymptotic behaviors with the increase in Reynolds number. The statistical properties of turbulence structures are further examined via the probability density function and time correlation of velocity fluctuations. At last, the dynamics in the separation bubble is investigated by examining the flow statistics and the budget equation of mean kinetic energy (MKE) on the coordinate with its origin fixed at the recirculation center, and the power spectral density of the velocity fluctuations. Similarities are in general observed for the mean velocities, Reynolds stresses, and the MKE budget in the rear part of the separation bubble. The mean convection term and turbulence convection term are observed playing a key role on the decrease in bubble size with the increase in Reynolds number. |
| WOS关键词 | LARGE-EDDY SIMULATION ; WALL-PRESSURE FLUCTUATIONS ; SEPARATED FLOW ; NUMERICAL-SIMULATION ; CHANNEL ; TURBINE ; MODELS ; GRADIENT ; LAYER |
| 资助项目 | NSFC Basic Science Center Program[11988102] ; National Natural Science Foundation of China[12002345] ; China Postdoctoral Science Foundation[2020M680027] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000721611800004 |
| 资助机构 | NSFC Basic Science Center Program ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/88034]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Yang, Xiaolei |
| 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 | Zhou, Zhideng,Wu, Ting,Yang, Xiaolei,et al. Reynolds number effect on statistics of turbulent flows over periodic hills[J]. PHYSICS OF FLUIDS,2021,33(10):28. |
| APA | Zhou, Zhideng,Wu, Ting,Yang, Xiaolei,&杨晓雷.(2021).Reynolds number effect on statistics of turbulent flows over periodic hills.PHYSICS OF FLUIDS,33(10),28. |
| MLA | Zhou, Zhideng,et al."Reynolds number effect on statistics of turbulent flows over periodic hills".PHYSICS OF FLUIDS 33.10(2021):28. |
入库方式： OAI收割
来源：力学研究所
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