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• W2057470677 abstract "Abstract Vortex-induced vibration (VIV) of a long riser in sheared current is oftenconsidered as an energy balance problem: Excitation forces in the power-inregion add an equal amount of energy to the system as is dissipated by dampingforces outside this region and by structural damping. A riser may havedifferent excitation and damping regions depending on the actual oscillationfrequency, cross-section properties and local flow velocity. A damping modelmust hence be able to handle higher and lower flow velocities than theexcitation velocity range. In this paper the fluid damping models proposed by Venugopal [1] are compared with the experiments conducted by Gopalkrishnan [2]and Vikestad [3]. The results show that the models are conservative at high andlow reduced velocities. Introduction VIV is dependent on many factors such as the Reynolds number, flow velocity andturbulence of the incident current, surface roughness, cross-section shape, inclination, motion of the structure, etc. No solutions or models exist whichcan account for all these factors. The solution has therefore been to simplify the interaction problem as muchas possible hopefully without loosing the information important for theprediction of the resulting VIV and fatigue life of the riser. One suchsimplification is to assume that each cross-section along the riser isoscillating harmonically in the cross-flow direction only and that the incidentflow is constant in time. Then the fluid forces can be split into two parts; the inertia part in phase with the acceleration and the excitation/damping partin phase with the velocity of the cross-section. If the force in phase withvelocity has the same sign as the velocity it is excitation, if it has oppositesign it is damping. In this paper we compare the damping model presented by Venugopal [1] toother experiments. The model predicts the damping force for oscillations instill water, at velocities lower than the excitation velocity range, and athigher. The Venugopal model was based on published empirical damping data fromsub-critical flow experiments. In this paper the Venugopal model is furthertested against the experimental data gathered by Vikestad [3]. The model wasfound to be slightly conservative in that it tends to underestimate thedamping, but not overly so." @default.
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• W2057470677 date "2000-05-01" @default.
• W2057470677 modified "2023-10-03" @default.
• W2057470677 title "Norwegian Deepwater Program: Damping of Vortex-Induced Vibrations" @default.
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• W2057470677 doi "https://doi.org/10.4043/11998-ms" @default.
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