The present paper describes the validation of the HVS (Heave and VIM Suppressed) semisubmersible’s VIM response by model test and Computational Fluid Dynamics (CFD). The HVS semisubmersible is designed to achieve significantly improved motion characteristics for supporting steel catenary risers in hurricane and Loop Current environment of the Gulf of Mexico. In the development of the HVS design, a simplified and efficient CFD analysis in which the rotational motions are ignored was first used as a high-level screening tool. A towing tank model test was then performed to validate the VIM performance of the HVS design. Both the model test and CFD analysis demonstrated that the HVS design has superior VIM response compared to an equivalent conventional semisubmersible design.

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