Branch/mode competition in the flow-induced vibration of a square cylinder.
作者信息
Zhao Jisheng, Nemes András, Lo Jacono David, Sheridan John
机构信息
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Victoria 3800, Australia
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Victoria 3800, Australia.
出版信息
Philos Trans A Math Phys Eng Sci. 2018 Aug 13;376(2126). doi: 10.1098/rsta.2017.0243.
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 = 20° (a new branch first observed by Nemes (2012 , 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'.
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