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Reduced-order modelling of vortex-induced vibration of catenary riser

Srinil, N. and Wiercigroch, M. and O' Brien, P. (2009) Reduced-order modelling of vortex-induced vibration of catenary riser. Ocean Engineering, 36 (17-18). pp. 1404-1414. ISSN 0029-8018

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    Abstract

    A new reduced-order model capable of analyzing the vortex-induced vibration of catenary riser in the ocean current has been developed. This semi analytical-numerical approach is versatile and allows for a significant reduction in computational effort for the analysis of fluid-riser interactions. The incoming current flow is assumed to be steady, uniform, unidirectional and perpendicular to the riser plane of initial equilibrium curvatures. The equations of riser 3-D motion are based on a pinned-pinned, tensioned-beam or flexural cable, modelling which accounts for overall effects of riser bending, extensibility, sag, inclination and structural nonlinearities. The unsteady hydrodynamic forces associated with cross-flow and in-line vibrations are modelled as distributed van der Pol wake oscillators. This hydrodynamic model has been modified in order to capture the effect of varying initial curvatures of the inclined flexible cylinder and to describe the space-time fluctuation of lift and drag forces. Depending on the vortex-excited in-plane/out-of-plane modes and system fluid-structure parameters, the parametric studies are carried out to determine the maximum response amplitudes of catenary risers, along with the occurrence of uni-modal lock-in phenomenon. The obtained results highlight the effect of initial curvatures and geometric nonlinearities on the nonlinear dynamics of riser undergoing vortex-induced vibration.

    Item type: Article
    ID code: 18456
    Keywords: reduced-order modelling, vortex-induced vibration, catenary riser, wake oscillator, fluid–structure interaction, Naval architecture. Shipbuilding. Marine engineering, Engineering (General). Civil engineering (General), Ocean Engineering, Environmental Engineering
    Subjects: Naval Science > Naval architecture. Shipbuilding. Marine engineering
    Technology > Engineering (General). Civil engineering (General)
    Department: Faculty of Engineering > Naval Architecture and Marine Engineering
    Related URLs:
      Depositing user: Dr Narakorn Srinil
      Date Deposited: 08 Apr 2010 10:34
      Last modified: 19 Aug 2014 23:21
      URI: http://strathprints.strath.ac.uk/id/eprint/18456

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