Numerical and experimental comparisons of vortex-induced vibrations of marine risers in uniform/sheared currents

Narakorn Srinil, Patrick O'Brien, Marian Wiercigrocha

Research output: Contribution to conferencePaper

1 Citation (Scopus)
8 Downloads (Pure)

Abstract

This paper presents a general theoretical reduced-order model capable of evaluating the multi-mode nonlinear dynamics of marine risers subject to uniform and sheared currents. The main objectives are to predict the vortex-induced vibration responses and parametrically compare between numerical and experimental results. The emphasis is placed on the analysis of cross-flow vibrations due to unsteady lift forces. The nonlinear equations governing riser axial/transversal motions are derived based on a top-tensioned beam model with typical pinned-pinned boundary conditions. The riser geometric nonlinearities owing to possible large dynamic displacements and multi-mode interactions are accounted for. To approximate the space-time varying lift force, the empirical hydrodynamic model, based on a nonlinear van der Pol wake oscillator with a distributed diffusive term, is used. A low-dimensional dynamic model and computationally-robust time-domain tool are then developed to evaluate the multi-mode fluid-riser interactions. These are very useful in dealing with large parametric studies involving varying system parameters.
Original languageEnglish
Pages1-10
Number of pages10
Publication statusPublished - 2010
EventThe 29th International Conference on Ocean, Offshore and Arctic Engineering - Shanghai, China
Duration: 6 Jun 201011 Jun 2010

Conference

ConferenceThe 29th International Conference on Ocean, Offshore and Arctic Engineering
CityShanghai, China
Period6/06/1011/06/10

Keywords

  • numerical comparisons
  • experimental comparisons
  • vortex-induced vibrations
  • marine risers
  • uniform currents
  • sheared currents
  • marine engineering

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    Srinil, N., O'Brien, P., & Wiercigrocha, M. (2010). Numerical and experimental comparisons of vortex-induced vibrations of marine risers in uniform/sheared currents. 1-10. Paper presented at The 29th International Conference on Ocean, Offshore and Arctic Engineering, Shanghai, China, .