Mella, D., Brevis, W. and Susmel, L. (2022) Effects of inflow conditions on low mass-damping cylinder subjected to vortex-induced vibrations. Ocean Engineering, 262. 112238. ISSN 0029-8018
Abstract
This work analyses the effects of the inflow conditions on the bifurcations characteristics of a two-degree-of-freedom low mass-damping cylinder undergoing vortex-induced vibrations. A two-dimensional RANS model was implemented to simulate the fluid–structure interaction problem. The cylinder response was analysed under different inflow conditions and systematic decrements of the inflow acceleration. The results showed a bifurcated response throughout the upper branch, dependent on the inflow conditions. A low-amplitude state was observed at high inflow accelerations, whereas a high-amplitude state was reached when the inflow acceleration decreased below a certain threshold. A proper selection of the inflow conditions led to a significant increment of the minimum inflow acceleration required to trigger the upper branch, reducing up to 60% of the computational time per simulation. The bifurcated response was divided based on its temporal stability, where the cylinder transitioned from a high- to a low-amplitude state after several high-amplitude oscillations. Unstable responses were associated with multi-frequency fluid forces that interfere with the fluid–cylinder energy transfer, precipitating a state transition. A systematic analysis of the unstable region showed that slight differences in the initial inflow conditions and the inherent simplifications of the tested two-dimensional RANS model significantly impacted the cylinder response stability.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 Elsevier Ltd. This is an author produced version of a paper subsequently published in Ocean Engineering. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Fluid-structure interaction; Vortex-induced vibrations; Bifurcation; Inflow velocity; Hysteresis |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 05 Sep 2022 09:50 |
Last Modified: | 24 Aug 2023 00:13 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.oceaneng.2022.112238 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:190624 |
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