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Branch/mode competition in the flow-induced vibration of a square cylinder

Zhao, Jisheng and Nemes, Andras and Lo Jacono, David and Sheridan, John Branch/mode competition in the flow-induced vibration of a square cylinder. (2018) Philosophical Transactions A: Mathematical, Physical and Engineering Sciences, 376 (2126). 20170243. ISSN 1364-503X

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Official URL: https://doi.org/10.1098/rsta.2017.0243

Abstract

The flow-induced vibration response of a square cross-sectional cylinder with low mass and damping ratio is analysed using continuous wavelet transforms (CWT) for three representative angles of attack of the cylinder to the incoming flow. The amplitude and frequency responses over a range of flow velocities map out multiple regimes (branches) of oscillation. Analysis of the time–frequency domain for boundary regions between branches using CWT reveals intermittency at the synchronization region boundaries as well as mode competition at branch boundaries. Complementary recurrence analysis shows that periodic dynamical states are interrupted by chaotic bursts in the transition regions around the higher branch at an angle of attack of α = 20◦ (a new branch first observed by Nemes et al. (2012 J. Fluid Mech. 710, 102–130 (doi:10.1017/jfm.2012.353))), supporting the CWT-based frequency–time analysis. This article is part of the theme issue ‘Redundancy rules: the continuous wavelet transform comes of age’.

Item Type:Article
HAL Id:hal-02094191
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Monash University (AUSTRALIA)
Laboratory name:
Funders:
Australian Research Council - ARC (AUSTRALIA) - Centre National de la Recherche Scientifique - CNRS (FRANCE)
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Deposited On:25 Feb 2019 09:27

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