ABSTRACT
Jose A. Ferrari Jr Petrobras SA - E&P, Rio de Janeiro, Brazil
Peter W.Bearman Department o f Aeronautics, Imperial College, London, UK
ABSTRACT: A model to predict the wave and vortex-induced response o f offshore risers is proposed. It cou ples dynamic solutions for the two planes o f vibration and takes account o f the hydroelastic interactions which occur between the structure and the fluid when the riser oscillates under wave and sheared current flows. A conventional approach for modeling fluid/structure interaction along the riser is adopted and a finiteelement structural model is used, coupled to suitable hydrodynamic models for in-line and transverse loading. The method addresses the multi-mode response problem and correctly predicts the attenuation experienced by modal waves as they travel along the riser. The motion of the platform is shown to have a large influence on the response amplitudes o f risers.
