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Effect of pulsating flow on flow-induced vibrations of circular and square cylinders in the laminar regime

Wang, Xinyu; Zhang, Zhongliang; Shi, Kai; Zhu, Xuefeng; Guo, Xu; Mei, Yue; Kadapa, Chennakesava

Authors

Xinyu Wang

Zhongliang Zhang

Kai Shi

Xuefeng Zhu

Xu Guo

Yue Mei



Abstract

Through fluid-structure interaction simulations, this study assesses the dynamic response characteristics of elastically mounted circular and square cylinders subjected to pulsating inflow conditions, providing valuable insights into the analysis and optimization of these systems. The main focus of the present work is on analyzing the effects of two factors: (i) the ratio of the oscillatory velocity component to the steady velocity component in pulsating flow (flow ratio) and (ii) the ratio of the oscillation frequency of pulsating flow to the natural frequency of the structure (frequency ratio). The simulation results for different parameters of interest are analysed using Fourier analysis and Poincaré maps of time series data, and contour plots of vorticity. For the circular cylinder, it is found that cylinder loses synchronization in lock-in as the flow and frequency ratios are increased. Three distinct vibration patterns of vortex-induced vibration are observed for selected combinations of flow and frequency ratios at a Reynolds number of 110 for circular cylinder. For the galloping of square cylinder at a Reynolds number of 250, it is found that the instability and nonlinearity of vortex shedding become more pronounced as the flow ratio increases.

Journal Article Type Article
Acceptance Date Mar 20, 2024
Online Publication Date Mar 27, 2024
Publication Date 2024-06
Deposit Date Mar 27, 2024
Publicly Available Date Mar 27, 2024
Print ISSN 0029-8018
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 301
Article Number 117609
DOI https://doi.org/10.1016/j.oceaneng.2024.117609
Keywords Vortex-induced vibration, Galloping, Fluid-structure interaction, Pulsating flow, Lock-in
Public URL http://researchrepository.napier.ac.uk/Output/3577155

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