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

doi:10.1063/5.0165627

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Blockage ratio and Reynolds number effects on flows around a rectangular prism
	Abdul-Salam, Fati Bio 2; Fang, Xingjun 1,2; Tachie, Mark Francis 2
刊名	PHYSICS OF FLUIDS
	2023-09-01
卷号	35 期号:9 页码:21
ISSN号	1070-6631
DOI	10.1063/5.0165627
通讯作者	Abdul-Salam, Fati Bio(abdulsa8@myumanitoba.ca)
英文摘要	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.
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)
WOS关键词	TURBULENT SEPARATIONS ; COHERENT STRUCTURES ; SQUARE ; WAKE ; CYLINDER ; AERODYNAMICS ; BODY
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:001078492700005
资助机构	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)
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/93131]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
通讯作者	Abdul-Salam, Fati Bio
作者单位	1.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China 2.Univ Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada
推荐引用方式 GB/T 7714	Abdul-Salam, Fati Bio,Fang, Xingjun,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,Fang, Xingjun,&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.