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http://dx.doi.org/10.1016/j.ijnaoe.2016.11.003

Experimental study on vortex-induced motions of a semi-submersible with square columns and pontoons at different draft conditions and current incidences  

Liu, Mingyue (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
Xiao, Longfei (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
Lu, Haining (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
Xiao, Xiaolong (State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.9, no.3, 2017 , pp. 326-338 More about this Journal
Abstract
The Vortex-induced Motions (VIM) phenomenon of semi-submersibles is relevant for the fatigue life of moorings and risers. Model tests regarding the VIM behavior of a semi-submersible with four square columns were conducted in order to investigate the effects of the current incidence and the aspect ratio of the immerged column. The experimental results show that the largest transverse amplitudes are around 70% of the column width at $30^{\circ}$ and $45^{\circ}$ incidences in a range of reduced velocities from 5 to 8 when the aspect ratio of the immerged column is 1.90. The largest yaw motion occurs at $0^{\circ}$ incidence with the peak value around $4.5^{\circ}$. Similar characteristics of the VIM response are observed for the semi-submersible with aspect ratios of 1.90 and 1.73. When the aspect ratio decreases 50% to 0.87, 30% decrease in the peak transverse amplitudes can be seen.
Keywords
Vortex-induced motions; Semi-submersible; Current incidence; Aspect ratio; Model tests;
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