Abstract
This paper presents a new theoretical model capable of predicting the vortex-induced vibration response of a steel catenary riser subject to a steady uniform current. The equations governing riser in-plane/out-ofplane (cross-flow/in-line) motion are based on a pinned beam-cable
model accounting for overall effects of bending, extensibility, sag, inclination and structural nonlinearities. The empirically hydrodynamic model is based on nonlinear wake oscillators describing the fluctuating
lift/drag forces. Depending on the potentially vortex-induced modes and system parameters, a reduced-order fluid-structure interaction model is derived which entails a significantly reduced computational time effort. Parametric results reveal maximum response amplitudes of risers, along with the occurrence of uni-modal lock-in phenomenon.
Original language | English |
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Pages | 129-136 |
Number of pages | 7 |
Publication status | Published - 2008 |
Event | The 8th ISOPE Pacific/Asia Offshore Mechanics Symposium - Bangkok Duration: 10 Nov 2008 → 14 Nov 2008 |
Conference
Conference | The 8th ISOPE Pacific/Asia Offshore Mechanics Symposium |
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City | Bangkok |
Period | 10/11/08 → 14/11/08 |
Keywords
- Catenary riser
- Vortex-induced vibration
- Wake oscillator
- Fluid-structure interaction
- Reduced-order model
- Empirical coefficient
- Uniform current