| Strouhal number for boundary shear flow past a circular cylinder in the subcritical flow regime |
| Liu Y(刘艳); Liu J(刘俊); Gao FP(高福平)
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| 通讯作者 | Gao, Fu-Ping(fpgao@imech.ac.cn)
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| 发表期刊 | OCEAN ENGINEERING
 |
| 2023-02-01
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| 卷号 | 269页码:13 |
| ISSN | 0029-8018
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| 摘要 | Strouhal number (St) is an essential dimensionless quantity for characterizing the vortex-shedding frequency of the flow past a cylinder. In this study, the Strouhal number for a near-wall circular cylinder fully immersed in a boundary shear flow in the subcritical flow regime was experimentally investigated in a water flume. The ve-locity fluctuations and flow fields of the lee-wake were systematically measured with an Acoustic Doppler Velocimeter (ADV) and an upward-illumination Particle Image Velocimetry (PIV) system, respectively. Based on dimensional analyses, a non-dimensional shear parameter (K) is introduced to characterize the shear flow. An explicit expression between K and e/D is obtained on the basis of the boundary theory and verified with the flume measurements. Spectral analysis of wake velocities indicates that the multi-peaks can be identified as the cyl-inder gets closer to the wall. The PIV measurements indicate that the multi-peaks spectra are predominantly induced by the intense interactions between the lower shear layer and wall boundary layer. By fitting the experimental results, empirical relationships for the variations of St with K or e/D are finally established for the subcritical flow regime. |
| 关键词 | Vortex shedding
Bed-proximity effects
Shear flow
Particle image velocimetry (PIV)
Circular cylinder
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| DOI | 10.1016/j.oceaneng.2022.113574
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000913641700001
|
| 关键词[WOS] | INDUCED VIBRATIONS
; ORGANIZATION
; MECHANISMS
; PROXIMITY
; FORCES
; WAKE
; WALL
|
| WOS研究方向 | Engineering
; Oceanography
|
| WOS类目 | Engineering, Marine
; Engineering, Civil
; Engineering, Ocean
; Oceanography
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| 资助项目 | National Natural Science Foundation of China[11825205]
; National Natural Science Foundation of China[12061160463]
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| 项目资助者 | National Natural Science Foundation of China
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| 论文分区 | 一类
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| 力学所作者排名 | 1
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| RpAuthor | Gao, Fu-Ping
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/91567
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| 专题 | 流固耦合系统力学重点实验室
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推荐引用方式
GB/T 7714 |
Liu Y,Liu J,Gao FP. Strouhal number for boundary shear flow past a circular cylinder in the subcritical flow regime[J]. OCEAN ENGINEERING,2023,269:13.
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| APA |
刘艳,刘俊,&高福平.(2023).Strouhal number for boundary shear flow past a circular cylinder in the subcritical flow regime.OCEAN ENGINEERING,269,13.
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| MLA |
刘艳,et al."Strouhal number for boundary shear flow past a circular cylinder in the subcritical flow regime".OCEAN ENGINEERING 269(2023):13.
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