Experimental investigation of the angle of attack dependence of the flow past a cactus-shaped cylinder with four ribs

Zhdanov, O. , Green, R. and Busse, A. (2021) Experimental investigation of the angle of attack dependence of the flow past a cactus-shaped cylinder with four ribs. Journal of Wind Engineering and Industrial Aerodynamics, 208, 104400. (doi: 10.1016/j.jweia.2020.104400)

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The aerodynamic properties of a two-dimensional cactus-shaped cylinder with four ribs are studied experimentally. The cross section of the cylinder corresponds to a modified square cylinder with rounded corners and concave sides inspired by tall succulents with four ribs. The mean aerodynamic coefficients, fluctuating lift coefficient, Strouhal number, and mean surface pressure distribution are measured as a function of the angular orientation for Reynolds numbers ranging from 50,000 to 150,000. Hot-wire measurements are conducted at two locations in the wake for several angles of attack to provide insight into the vortex shedding frequencies. The results show that the studied shape exhibits a strong angle of attack dependence while no Reynolds number dependence is found within the tested range. As for the square cylinder, a critical angle of attack of approximately 13° is observed at which drag and fluctuating lift forces are minimised while mean lift and Strouhal number reach their highest values. Reattachment of the shear layer at and above the critical angle of attack is confirmed using PIV. Overall, succulents with four ribs retain some of the aerodynamic benefits that have been observed for cactus-shaped cylinders with many ribs, albeit over a limited range of angles of attack.

Item Type:Articles
Additional Information:The authors gratefully acknowledge access to the low-speed National Wind Tunnel Facility funded by the Engineering and Physical Sciences Research Council, grant number EP/L024888/1, and support by the University of Glasgow's Lord Kelvin/Adam Smith (LKAS) PhD scholarship scheme.
Glasgow Author(s) Enlighten ID:Green, Dr Richard and Zhdanov, Dr Oleksandr and Busse, Dr Angela
Creator Roles:
Zhdanov, O.Conceptualization, Methodology, Investigation, Formal analysis, Data curation, Writing – original draft, Writing – review and editing
Green, R.Methodology, Investigation, Formal analysis, Supervision, Resources, Writing – review and editing
Busse, A.Conceptualization, Resources, Supervision, Writing – review and editing
Authors: Zhdanov, O., Green, R., and Busse, A.
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Journal of Wind Engineering and Industrial Aerodynamics
ISSN (Online):1872-8197
Published Online:02 November 2020
Copyright Holders:Copyright © 2020 Elsevier Ltd.
First Published:First published in Journal of Wind Engineering and Industrial Aerodynamics 208: 104400
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190699National Wind Tunnel FacilityFrank CotonEngineering and Physical Sciences Research Council (EPSRC)EP/L024888/1ENG - Aerospace Sciences