LES and PIV investigation of the flow past a cactus-shaped cylinder with four ribs

Zhdanov, O. , Green, R. and Busse, A. (2023) LES and PIV investigation of the flow past a cactus-shaped cylinder with four ribs. Flow, Turbulence and Combustion, 110(4), pp. 775-798. (doi: 10.1007/s10494-022-00386-y)

Abstract

The flow past a cactus-shaped cylinder with four ribs is investigated numerically using large eddy simulations (LES) at Reynolds number of 20,000 and experimentally using particle image velocimetry (PIV) at Reynolds number of 50,000. In both approaches, the full range of angle of attack is covered. LES results show a good qualitative and quantitative match of the aerodynamic properties to previous experimental data, although the value of the critical angle of attack is slightly lower. The results confirm that there is no Reynolds number dependency within the investigated range allowing a comparison of the flow fields from the present LES and PIV. Significant variations of the flow patterns with the angle of attack are found and quantified using the recirculation length and wake width. Overall, the observed angle of attack dependence resembles the behaviour of the square cylinder. However, the studied cylinder has a narrower wake at all angular orientations. Proper orthogonal decomposition is used to identify large coherent structures in the flow. At all angles of attack the first two modes remain dominant making it possible to reconstruct the periodic vortex shedding process using a low-order model.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Busse, Professor Angela and Green, Dr Richard and Zhdanov, Dr Oleksandr
• 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: Flow, Turbulence and Combustion
• Publisher: Springer
• ISSN: 1386-6184
• ISSN (Online): 1573-1987
• Published Online: 18 November 2022
• Copyright Holders: Copyright © 2022 The Authors
• First Published: First published in Flow, Turbulence and Combustion 110(4): 775-798
• Publisher Policy: Reproduced under a Creative Commons License