Srinil, N. and O'Brien, P. and Wiercigrocha, M. (2010) Numerical and experimental comparisons of vortex-induced vibrations of marine risers in uniform/sheared currents. In: The 29th International Conference on Ocean, Offshore and Arctic Engineering, 2010-06-06 - 2010-06-11, Shanghai, China.
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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.
|Item type:||Conference or Workshop Item (Paper)|
|Keywords:||numerical comparisons, experimental comparisons, vortex-induced vibrations, marine risers, uniform currents, sheared currents, marine engineering, Naval architecture. Shipbuilding. Marine engineering, Engineering (General). Civil engineering (General)|
|Subjects:||Naval Science > Naval architecture. Shipbuilding. Marine engineering|
Technology > Engineering (General). Civil engineering (General)
|Department:||Faculty of Engineering > Naval Architecture and Marine Engineering|
|Depositing user:||Dr Narakorn Srinil|
|Date Deposited:||07 Apr 2010 10:40|
|Last modified:||06 Oct 2012 08:41|
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