RELIABILITY ASSESSMENT OF CYLINDRICAL OFFSHORE STRUCTURES SUBJECTED TO CROSS-FLOW VORTEX-INDUCED VIBRATIONS IN SHEARED AND PARABOLIC CURRENTS
Henry Francis Annapeh,
Victoria Kurushina
Abstract: Cross-flow vortex-induced vibration of offshore structures is a complex, challenging to predict phenomenon with an impact on the structural integrity and lifespan and with the sensitivity to flow conditions. The current study is focused on the cross-flow vibration of a cylindrical structure in the linearly sheared and parabolic flows. The work is performed with the computational fluid dynamics method in 2D for the Reynolds number range of 350-2150, mass ratio of 2 and shear parameter from 0 to 0.05 for the linearly sheared current. The results obtained indicate differences in the width of the upper branch of the lock-in and characteristics of the lower branch related to the sheared flow profile. The study also reports a more stable trend in the growing lift coefficient, mean drag coefficient and frequency ratio in sheared flow, compared to the uniform flow.
Keywords: Vortex-induced vibrations, Sheared flow, Parabolic flow, Offshore structures, Computational fluid dynamics
DOI: 10.24874/IJQR20.01-07
Recieved: 03.12.2024 Accepted: 10.06.2025 UDC:
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