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Modes of synchronisation around a near-wall oscillating cylinder in streamwise directions

Published online by Cambridge University Press:  17 April 2020

Xiaoying Ju Open the ORCID record for Xiaoying Ju [Opens in a new window] ,
Hongwei An Open the ORCID record for Hongwei An [Opens in a new window] ,
Liang Cheng  and
Feifei Tong Open the ORCID record for Feifei Tong [Opens in a new window]
Xiaoying Ju
Affiliation:
School of Engineering, University of Western Australia, 35 Stirling Highway,Crawley, WA 6009, Australia
Hongwei An
Affiliation:
School of Engineering, University of Western Australia, 35 Stirling Highway,Crawley, WA 6009, Australia
Liang Cheng*
Affiliation:
School of Engineering, University of Western Australia, 35 Stirling Highway,Crawley, WA 6009, Australia DUT–UWA Joint Research Centre, State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology, No. 2 Linggong Road, 116024Dalian, PR China
Feifei Tong*
Affiliation:
School of Engineering, University of Western Australia, 35 Stirling Highway,Crawley, WA 6009, Australia
*
†Email addresses for correspondence: [email protected], [email protected]
†Email addresses for correspondence: [email protected], [email protected]
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Abstract

Two-dimensional direct numerical simulations of a cylinder undergoing forced streamwise oscillations in steady approaching flow are conducted over ranges of oscillation amplitude, oscillation frequency and gap distance between the cylinder and the wall at a Reynolds number of 175. The flow characteristics are found to be strongly affected by the gap distance, compared to those observed around an isolated cylinder (Tang et al., J. Fluid Mech., vol. 832, 2017, pp. 146–169). The synchronisation modes are mapped out in the parameter ranges. The existence of the plane wall leads to an increased chance of occurrence of high-order modes with the denominator being an odd number. Two new flow phenomena, namely the period doubling and transition to quasi-periodic states through cascade of period doubling within the primary synchronisation region, are observed. The interaction of the plane-wall boundary layer with vortices shed from the cylinder and the asymmetry of the flow through the gap and around the top side of the cylinder are identified as the primary physical mechanisms responsible for the observed behaviours. The influence of velocity gradient in the plane-wall boundary layer on the two new phenomena is quantified through a numerical test involving linear shear flow around an isolated cylinder. The period-doubling phenomenon occurs only when the velocity gradient is larger than a critical value. The results obtained through three-dimensional simulations suggest that the synchronisation modes identified through two-dimensional simulations are not significantly affected by the three-dimensionality of the flow over the parameter ranges covered in the present study.

JFM classification

Vortex Flows: Vortex dynamics Wakes/Jets: Shear layers
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 893 , 25 June 2020 , A8
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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