Numerical analysis of enhancing water-drop fairing design to mitigate vortex-induced vibrations by applying angular slot

Michael Adel Shafik, Mina G. Mourad, Osama E. Abdellatif, Ahmed S. Shehata

Abstract


Marine risers are crucial components of offshore oil and gas production systems, connecting the seabed to the surface platform. They are susceptible to vortex-induced vibrations (VIV). As a result, marine risers are susceptible to failure, which can have disastrous effects, including environmental damage, loss of output, and even loss of life. Vortices that are generated in the viscous boundary layer tend to separate toward the downstream end of the cylinder. A fairing is a body with a hydrofoil shape added to the marine risers to reduce the effect of VIV on the marine riser. The investigation will be undertaken using a two-dimensional computational Fluid dynamics model using the software ANSYS Fluent. A slot is applied to a water-drop fairing that has a top shape angle of 80° to improve the suppression of the VIV. The behavior of the fairing in VIV is compared using the root mean square of the lift coefficient (Cl RMS). The angle between the slot and the vertical is altered to discover the ideal angle that shows the lowest value of Cl RMS. The results of the current investigation identified the ideal possible angle for the slot. The slot that has an angle of 30 clockwise with vertical has been shown to be the best at dampening VIV, with a 37.8% reduction in Cl RMS. 

Keywords


Marine riser, vortex-induced vibration, CFD

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References


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DOI: https://dx.doi.org/10.21622/MARLOG.2024.13.1.101

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Copyright (c) 2025 Michael Adel Shafik, Mina G. Mourad, Osama E. Abdellatif, Ahmed S. Shehata

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The International Maritime Transport and Logistics Journal (MARLOG)

E-ISSN: 2974-3141
P-ISSN: 2974-3133

Published by:

Academy Publishing Center (APC)

Arab Academy for Science, Technology and Maritime Transport (AASTMT)

Alexandria, Egypt