| Influences of blockage ratio and Reynolds number on the spatiotemporal dynamics around a rectangular prism | |
| AbdulSalam, Fati Bio; Fang XJ(方兴军); Tachie, Mark Francis | |
| Source Publication | PHYSICS OF FLUIDS
 |
| 2024-10 | |
| Volume | 36Issue:10Pages:105198 |
| ISSN | 1070-6631 |
| Abstract | Particle image velocimetry is used to experimentally investigate the influence of blockage ratio (BR) and Reynolds number (Re) on the turbulent flow around a rectangular prism with depth-to thickness ratio of 3. The prism was selected because it falls within the intermediate regime where the turbulent dynamics is sensitive to the incoming boundary condition. The tested blockage ratios were 2.5%, 5%, and 10% at Reynold numbers of 3000 and 7500. The results are analyzed in terms of the mean flow, turbulent kinetic energy (TKE), frequency spectra, reverse flow area, as well as spectral proper orthogonal decomposition (SPOD). The results indicate that as blockage ratio and/or Reynolds number increase, the tendency of reattachment of the separated shear layer onto the surface of the prism increases while the location of maximum TKE over the prism shifts toward the leading edge, indicating earlier transition of the separated shear layer from laminar to turbulence. For the cases without mean reattachment over the side faces of the prisms, the separated bubble over and downstream of the prism exhibits strong tendency of synchronization in terms of the instantaneous areas of the flow reversal, suggesting a global instability mechanism encompassing the entire prism. In cases with mean flow reattachment, conversely, the low-frequency flapping motion manifests over the prism. SPOD analysis further shows that the relevant shedding dynamics are captured in the first mode and the von K & aacute;rm & aacute;n shedding structures have the highest energy. |
| DOI | 10.1063/5.0230896 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001349426300009 |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Organization | Natural Sciences and Engineering Research Council of Canada10.13039/501100000038 {RGPIN-2017-04957] ; Natural Science and Engineering Research Council of Canada (NSERC) {32999] ; Canada Foundation for Innovation (CFI) |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Abdul-Salam FB |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/97224 |
| Collection | 流固耦合系统力学重点实验室 |
| Affiliation | 1.【Abdul-Salam, Fati Bio & Fang, Xingjun & Tachie, Mark Francis】 Univ Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada 2.【Fang, Xingjun】 Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China |
| Recommended Citation GB/T 7714 | AbdulSalam, Fati Bio,Fang XJ,Tachie, Mark Francis. Influences of blockage ratio and Reynolds number on the spatiotemporal dynamics around a rectangular prism[J]. PHYSICS OF FLUIDS,2024,36,10,:105198.Rp_Au:Abdul-Salam FB |
| APA | AbdulSalam, Fati Bio,方兴军,&Tachie, Mark Francis.(2024).Influences of blockage ratio and Reynolds number on the spatiotemporal dynamics around a rectangular prism.PHYSICS OF FLUIDS,36(10),105198. |
| MLA | AbdulSalam, Fati Bio,et al."Influences of blockage ratio and Reynolds number on the spatiotemporal dynamics around a rectangular prism".PHYSICS OF FLUIDS 36.10(2024):105198. |
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