Vortex Induced Motion (VIM) of a Deep Draft Semi® with four square columns has been observed in model tests and in a prototype configuration. The flow field around the columns causes the vessel to oscillate along one of the vessel’s main diagonals under particular conditions. The observations and conclusions of three series of VIM model programs are combined in this report. Each test program was executed with a unique objective in mind and each setup was unique. Many similarities in response characteristics have been identified. Some of the differences in observed response are identified and discussed. A discussion is provided regarding the scaling of VIM problems, and the importance of the Reynolds number under model test conditions is discussed. The VIM of a typical Gulf of Mexico Deep Draft Semi® may affect the fatigue life of the mooring system and risers. A formulation is developed that predicts the distribution of VIM amplitudes which then can be used to estimate VIM induced fatigue damage. Observations and conclusions are provided of several experiments where VIM response was evaluated in the presence of a fatigue sea state and for a system with increased sway damping.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4821-0
PROCEEDINGS PAPER
Experimental Study Into Vortex Induced Motion Response of Semi Submersibles With Square Columns
Steven Leverette
Steven Leverette
SBM Atlantia, Houston, TX
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Oriol Rijken
SBM Atlantia, Houston, TX
Steven Leverette
SBM Atlantia, Houston, TX
Paper No:
OMAE2008-57396, pp. 263-276; 14 pages
Published Online:
July 27, 2009
Citation
Rijken, O, & Leverette, S. "Experimental Study Into Vortex Induced Motion Response of Semi Submersibles With Square Columns." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 4: Ocean Engineering; Offshore Renewable Energy. Estoril, Portugal. June 15–20, 2008. pp. 263-276. ASME. https://doi.org/10.1115/OMAE2008-57396
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