Multi-scale analyses of flow separation around rectangular prisms in uniform flow
文献类型：期刊论文
| 作者 | Kumahor, Sedem3; Fang XJ(方兴军)2,3; Martinuzzi, Robert J1; Tachie, Mark F3 |
| 刊名 | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
 |
| 出版日期 | 2026 |
| 卷号 | 117页码:13 |
| 关键词 | PIV Vortex shedding POD of vorticity Flow separation Bluff body Uniform flow |
| ISSN号 | 0142-727X |
| DOI | 10.1016/j.ijheatfluidflow.2025.110012 |
| 通讯作者 | Kumahor, Sedem(kumahors@myumanitoba.ca) |
| 英文摘要 | Turbulent flows around infinitely spanned rectangular prisms in uniform flow with streamwise aspect ratios, AR = 1, 2, and 3 were studied using time-resolved particle image velocimetry (TR-PIV) at a Reynolds number of 16,200 based on free-stream velocity and prism height. These aspect ratios span regimes that transition from direct shear layer shedding in the wake (AR1) to intermittent reattachment (AR2) and mean reattachment on the prism surface (AR3). The mean flow topology, Reynolds shear stress, and turbulent transport were analyzed. Spatiotemporal characteristics were investigated using two-point correlation, integral time scales, reverse flow areas, and proper orthogonal decomposition (POD) of the vorticity field. The results reveal non-monotonic variations of statistical and structural characteristics with aspect ratio. The case of AR2 possesses the largest recirculation region as well as the largest spatial and temporal scales of coherent structures. The wake exhibits quasi-periodic fluctuations concentrated in a single frequency for AR1, and AR3 but dual frequencies for AR2. The POD of the vorticity effectively decomposed a wide range of scales. Depending on the aspect ratio, spectra of the POD coefficients revealed concentrated spectral energy at the dominant vortex shedding frequency, its harmonics and at Kelvin-Helmholtz instability frequencies associated with small-scale vortices near the leading edge. |
| 分类号 | 二类 |
| WOS关键词 | TURBULENT-FLOW ; SPATIAL CHARACTERIZATION ; COHERENT STRUCTURES ; STROUHAL NUMBERS ; VORTICITY FIELDS ; WAKE ; CYLINDERS ; DYNAMICS |
| 资助项目 | Natural Sciences and Engineering Research Council of Canada (NSERC) ; Canada Foundation for Innovation |
| WOS研究方向 | Thermodynamics ; Engineering ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001559377000001 |
| 资助机构 | Natural Sciences and Engineering Research Council of Canada (NSERC) ; Canada Foundation for Innovation |
| 其他责任者 | Kumahor, Sedem |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/103608]  |
| 专题 | 力学研究所_流固耦合系统力学重点实验室(2012-) |
| 作者单位 | 1.Univ Calgary, Dept Mech & Mfg Engn, Calgary, AB T2N 1N4, Canada 2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 3.Univ Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada; |
| 推荐引用方式 GB/T 7714 | Kumahor, Sedem,Fang XJ,Martinuzzi, Robert J,et al. Multi-scale analyses of flow separation around rectangular prisms in uniform flow[J]. INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW,2026,117:13. |
| APA | Kumahor, Sedem,方兴军,Martinuzzi, Robert J,&Tachie, Mark F.(2026).Multi-scale analyses of flow separation around rectangular prisms in uniform flow.INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW,117,13. |
| MLA | Kumahor, Sedem,et al."Multi-scale analyses of flow separation around rectangular prisms in uniform flow".INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW 117(2026):13. |
入库方式： OAI收割
来源：力学研究所
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