| Reynolds number effect on statistics of turbulent flows over periodic hills | |
Zhou ZD(周志登)1,2 ; Wu T(吴霆)1,2; Yang XL(杨晓雷)1,2
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| Corresponding Author | Yang, Xiaolei([email protected]) |
| Source Publication | PHYSICS OF FLUIDS
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| 2021-10-01 | |
| Volume | 33Issue:10Pages:28 |
| ISSN | 1070-6631 |
| Abstract | 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. |
| DOI | 10.1063/5.0062786 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000721611800004 |
| WOS Keyword | LARGE-EDDY SIMULATION ; WALL-PRESSURE FLUCTUATIONS ; SEPARATED FLOW ; NUMERICAL-SIMULATION ; CHANNEL ; TURBINE ; MODELS ; GRADIENT ; LAYER |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | NSFC Basic Science Center Program[11988102] ; National Natural Science Foundation of China[12002345] ; China Postdoctoral Science Foundation[2020M680027] |
| Funding Organization | NSFC Basic Science Center Program ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Yang, Xiaolei |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/88035 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.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 | Zhou ZD,Wu T,Yang XL. Reynolds number effect on statistics of turbulent flows over periodic hills[J]. PHYSICS OF FLUIDS,2021,33,10,:28.Rp_Au:Yang, Xiaolei |
| APA | 周志登,吴霆,&杨晓雷.(2021).Reynolds number effect on statistics of turbulent flows over periodic hills.PHYSICS OF FLUIDS,33(10),28. |
| MLA | 周志登,et al."Reynolds number effect on statistics of turbulent flows over periodic hills".PHYSICS OF FLUIDS 33.10(2021):28. |
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| 62786.pdf（16361KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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