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New model for vortex-induced vibration of catenary riser

Srinil, N. and Wiercigrocha, M. and O'Brien, P. (2008) New model for vortex-induced vibration of catenary riser. In: The 8th ISOPE Pacific/Asia Offshore Mechanics Symposium, 2008-11-10 - 2008-11-14, Bangkok.

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    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.

    Item type: Conference or Workshop Item (Paper)
    ID code: 18560
    Keywords: Catenary riser, Vortex-induced vibration, Wake oscillator, Fluid-structure interaction, Reduced-order model, Empirical coefficient, Uniform current, Engineering (General). Civil engineering (General)
    Subjects: Technology > Engineering (General). Civil engineering (General)
    Department: Faculty of Engineering > Naval Architecture and Marine Engineering
    Related URLs:
    Depositing user: Dr Narakorn Srinil
    Date Deposited: 05 Apr 2010 12:08
    Last modified: 05 Oct 2012 06:49

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