This paper investigates nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations based on a computationally efficient reduced-order fluid-structure interaction model. Cross-flow responses as a result of a steady uniform current are considered. The geometrically nonlinear equations of riser motion are coupled with nonlinear wake oscillators which have been modified to capture the effect of initial curvatures of curved cylinder and to approximate the space-time varying hydrodynamic lift forces. The main objectives are to provide new insights into the vortex-induced vibration characteristics of risers under external and internal resonances and to distinguish nonlinear dynamic behaviors between curved catenary and straight toptensioned risers. The analyses of multi-mode contributions, lock-in regimes, response amplitudes, resonant nonlinear modes and curvatures are carried out and several interesting aspects are highlighted.
|Number of pages||7|
|Publication status||Published - 2009|
|Event||The 19th International Offshore and Polar Engineering - Osaka|
Duration: 21 Jul 2009 → 26 Jul 2009
|Conference||The 19th International Offshore and Polar Engineering|
|Period||21/07/09 → 26/07/09|
- Subsea riser
- Vortex-induced vibration
- Wake oscillator
- Fluid-structure interaction
- Reduced-order model
- Multi-mode interaction
- Resonant nonlinear mode
Srinil, N., Wiercigrocha, M., O'Brien, P., & KTP (Funder) (2009). Nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations. 1329-1336. Paper presented at The 19th International Offshore and Polar Engineering, Osaka, .