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Flow states and transitions in flows past arrays of tandem cylinders

Published online by Cambridge University Press:  15 January 2021

Negar Hosseini Open the ORCID record for Negar Hosseini [Opens in a new window] ,
Martin D. Griffith Open the ORCID record for Martin D. Griffith [Opens in a new window]  and
Justin S. Leontini Open the ORCID record for Justin S. Leontini [Opens in a new window]
Negar Hosseini*
Affiliation:
Department of Mechanical and Product Design Engineering, Swinburne University of Technology, John Street, Hawthorn, VIC3122, Australia
Martin D. Griffith
Affiliation:
Department of Mechanical and Product Design Engineering, Swinburne University of Technology, John Street, Hawthorn, VIC3122, Australia
Justin S. Leontini
Affiliation:
Department of Mechanical and Product Design Engineering, Swinburne University of Technology, John Street, Hawthorn, VIC3122, Australia
*
†Email address for correspondence: negar.mhoseini@gmail.com
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Abstract

Direct numerical simulations at $Re=200$ have been conducted of the flow past rows of tandem cylinders. It is shown that when the pitch between the two upstream cylinders is large, the wake downstream is characterised by a two-row vortex structure. Placing a third body on the wake centreline in the majority of this two-row structure has basically no impact both upstream and downstream – the third body is cloaked. However, a region is identified where the placement of a body suppresses vortex shedding from the first cylinder and the two-row structure is destroyed, globally broadcasting the presence of the third body. The effect is shown to occur for different third-body shapes. To understand the existence of this broadcasting region, local instability analysis is conducted which shows the majority of the two-row structure to be convectively unstable, with only a small region adjacent to the rear of the second cylinder that is absolutely unstable. This suggests only bodies placed close to the second body will trigger the global change, and this is supported by a global sensitivity analysis and observation from the simulations. However, neither the local analysis nor the global sensitivity analysis explains the presence of a lower limit for the third-body position that will trigger a global change. However the simulation results clearly show that a third body placed very close to the second body does not trigger this change.

JFM classification

Instability: Absolute/convective instability Vortex Flows: Vortex shedding Wakes/Jets: Wakes
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 910 , 10 March 2021 , A34
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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