Vortex Induced Motion (VIM) response of a deep draft semisubmersible with square columns has been observed various model test conditions and in the field. A good understanding of the VIM phenomenon is desired because VIM can lead to significant SCR fatigue, especially for the larger diameters SCRs. A VIM design guidance was developed from several previous experimental investigations. Those experimental investigations are characterized by hulls with limited detail, and a simplified mooring / SCR system where typically only the stiffness is taken into consideration. A comparative experimental study is performed to identify the differences in VIM response under the absence and presence of hull appurtenances. Further, the VIM responses of a semisubmersible restrained by a mooring system without and with an SCR system are compared. An evaluation of the experimental results leads to an improved understanding of the VIM response at model test scale.
Experimental Investigations Into the Influences of SCRs and Appurtenances on Deepdraft Semisubmersible Vortex Induced Motion Response
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Rijken, O, Schuurmans, S, & Leverette, S. "Experimental Investigations Into the Influences of SCRs and Appurtenances on Deepdraft Semisubmersible Vortex Induced Motion Response." Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Volume 6: Ocean Engineering. Rotterdam, The Netherlands. June 19–24, 2011. pp. 269-279. ASME. https://doi.org/10.1115/OMAE2011-49365
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