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Numerical simulations of vortex-induced vibrations on vertical cylindrical structure with different aspect ratios

Rahman, MA; Leggoe, J; Thiagarajan, K; Mohd, MH; Paik, JK; (2016) Numerical simulations of vortex-induced vibrations on vertical cylindrical structure with different aspect ratios. Ships and Offshore Structures , 11 (4) pp. 405-423. 10.1080/17445302.2015.1013783. Green open access

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Abstract

This paper presents a computational fluid dynamics (CFD) study of vortex-induced vibration (VIV) for different aspect ratio (L/D) cylinder. Of particular interest was to measure hydrodynamic forces and numerically investigate the wake behaviour of VIV while varying the aspect ratio. The simulation models represented the actual experimental conditions with idealised free-surface boundary condition to capture the responses from fluid-structure interaction phenomenon. The simulations were performed in the subcritical flow region (7.4×103 < Re < 2×105), corresponding to a range of reduced velocity (Ur) from 2 to 14. The results of the cases studied were discussed and compared with the experimental data to verify the accuracy and validity of the present simulation. The comparisons have shown a similar curved-shape drag coefficient plot, and however underestimated the value of the drag coefficients over the reduced velocity. Additionally, the simulations seemed to capture a higher lift force response compared with the experimental data for a low aspect ratio. The correlation length was observed to be longer for larger aspect ratio and proportionally decreases as the aspect ratio decreases.

Type: Article
Title: Numerical simulations of vortex-induced vibrations on vertical cylindrical structure with different aspect ratios
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/17445302.2015.1013783
Publisher version: http://doi.org/10.1080/17445302.2015.1013783
Language: English
Additional information: © 2015 Taylor & Francis. This is an Accepted Manuscript of an article published by Taylor & Francis in Ships and Offshore Structures on 2 March 2015, available online: http://www.tandfonline.com/10.1080/17445302.2015.1013783
Keywords: Vortex-induced vibrations, numerical simulation, aspect ratio effects, cylindrical offshore structure
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1535318
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