Blockage ratio and Reynolds number effects on flows around a rectangular prism

doi:10.1063/5.0165627

IMECH-IR > 流固耦合系统力学重点实验室

	Blockage ratio and Reynolds number effects on flows around a rectangular prism
	Abdul-Salam, Fati Bio; Fang XJ(方兴军); Tachie, Mark Francis
通讯作者	Abdul-Salam, Fati Bio(abdulsa8@myumanitoba.ca)
发表期刊	PHYSICS OF FLUIDS
	2023-09-01
卷号	35 期号:9 页码:21
ISSN	1070-6631
摘要	The combined effects of blockage ratio (BR) and Reynolds number (Re) on the spatiotemporal characteristics of turbulent flow separation around a rectangular prism with depth-to-thickness ratio of 3 were investigated using a time-resolved particle image velocimetry. Four different blockage ratios (BR = 2.5%, 5%, 10%, and 15%) were examined at Reynolds numbers of 3000, 7500, and 15000. Two regimes (unattached and reattached) were identified; however, the boundary between these regimes shows a complex dependency on BR and Re. The mean flow does not reattach onto the prism at low BR and Re but tends to reattach when BR and Re increase. The wake vortices are relatively larger for the unattached test cases. The separation bubbles over and in the wake of the prism are dynamically coupled for prisms in the unattached regime but independent of each other in the reattached regime. Spectral analyses of the velocity fluctuations and coefficient of the first proper orthogonal decomposition mode pair reveal a single dominant peak at the same fundamental shedding frequency for the reattached test cases, whereas multiple competing frequencies are observed for test cases in the unattached regime. The Kelvin-Helmholtz frequency increases with an increase in BR and Re. The vortical structures are more organized for prisms in the reattached regime, and their convective velocities in the wake are comparatively higher.
DOI	10.1063/5.0165627
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001078492700005
关键词[WOS]	TURBULENT SEPARATIONS ; COHERENT STRUCTURES ; SQUARE ; WAKE ; CYLINDER ; AERODYNAMICS ; BODY
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	The authors are grateful for the financial support from the Natural Science and Engineering Research Council of Canada (NSERC) to Mark F. Tachie. We are also grateful to Canada Foundation for Innovation (CFI) for their invaluable support in funding the exp ; Natural Science and Engineering Research Council of Canada (NSERC) ; Canada Foundation for Innovation (CFI)
项目资助者	The authors are grateful for the financial support from the Natural Science and Engineering Research Council of Canada (NSERC) to Mark F. Tachie. We are also grateful to Canada Foundation for Innovation (CFI) for their invaluable support in funding the exp ; Natural Science and Engineering Research Council of Canada (NSERC) ; Canada Foundation for Innovation (CFI)
论文分区	一类/力学重要期刊
力学所作者排名	2
RpAuthor	Abdul-Salam, Fati Bio
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/93132
专题	流固耦合系统力学重点实验室
推荐引用方式 GB/T 7714	Abdul-Salam, Fati Bio,Fang XJ,Tachie, Mark Francis. Blockage ratio and Reynolds number effects on flows around a rectangular prism[J]. PHYSICS OF FLUIDS,2023,35,9,:21.
APA	Abdul-Salam, Fati Bio,方兴军,&Tachie, Mark Francis.(2023).Blockage ratio and Reynolds number effects on flows around a rectangular prism.PHYSICS OF FLUIDS,35(9),21.
MLA	Abdul-Salam, Fati Bio,et al."Blockage ratio and Reynolds number effects on flows around a rectangular prism".PHYSICS OF FLUIDS 35.9(2023):21.

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