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Oscillatory flow regimes around four cylinders in a square arrangement under small $\mathit{KC}$ and $\mathit{Re}$ conditions

Published online by Cambridge University Press:  17 March 2015

Feifei Tong ,
Liang Cheng ,
Ming Zhao  and
Hongwei An
Feifei Tong*
Affiliation:
School of Civil, Environmental and Mining Engineering, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Liang Cheng
Affiliation:
School of Civil, Environmental and Mining Engineering, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, PR China
Ming Zhao
Affiliation:
School of Computing, Engineering and Mathematics, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia
Hongwei An
Affiliation:
School of Civil, Environmental and Mining Engineering, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
*
†Email address for correspondence: feifei.tong@uwa.edu.au
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Abstract

Sinusoidally oscillatory flow around four circular cylinders in an in-line square arrangement is numerically investigated at Keulegan–Carpenter numbers ( $\mathit{KC}$ ) ranging from 1 to 12 and at Reynolds numbers ( $\mathit{Re}$ ) from 20 to 200. A set of flow patterns is observed and classified based on known oscillatory flow regimes around a single cylinder. These include six types of reflection symmetry regimes to the axis of flow oscillation, two types of spatio-temporal symmetry regimes and a series of symmetry-breaking flow patterns. In general, at small gap distances, the four structures behave more like a single body, and the flow fields therefore resemble those around a single cylinder with a large effective cylinder diameter. With increasing gap distance, flow structures around each individual cylinder in the array start to influence the overall flow patterns, and the flow field shows a variety of symmetry and asymmetry patterns as a result of vortex and shear layer interactions. The characteristics of hydrodynamic forces on individual cylinders as well as on the cylinder group are also examined. It is found that the hydrodynamic forces respond in a similar manner to the flow field to the cylinder proximity and wake interference.

JFM classification

Low-Reynolds-number flows: Low-Reynolds-number flows Vortex Flows: Vortex Flows Vortex Flows: Vortex interactions

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Papers
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Journal of Fluid Mechanics , Volume 769 , 25 April 2015 , pp. 298 - 336
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© 2015 Cambridge University Press 

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