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 language | English |
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Pages | 479-488 |
Number of pages | 10 |
DOIs | |
Publication status | Published - 2010 |
Event | The 29th International Conference on Ocean, Offshore and Arctic Engineering - Shanghai, China Duration: 6 Jun 2010 → 11 Jun 2010 |
Conference
Conference | The 29th International Conference on Ocean, Offshore and Arctic Engineering |
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City | Shanghai, China |
Period | 6/06/10 → 11/06/10 |
Keywords
- numerical comparisons
- experimental comparisons
- vortex-induced vibrations
- marine risers
- uniform currents
- sheared currents
- marine engineering