An experimental study on vortex-induced motion responses of a moored semi-submersible with and without riser

摘要

This article presents an experimental study on the "vortex-induced motion" responses of a moored "semi-submersible without catenary riser" and "semi-submersible with catenary riser." An eight-point catenary mooring system is adopted for the study in which eight rollers are installed on the pontoons for guiding the mooring lines and the semi-submersible design is of two rectangular pontoon and two circular columns on each of the pontoons. To replicate the real-world scene, the experiments are conducted in wave-cum-current flume with five directions of current (i.e. 0 degrees, 30 degrees, 45 degrees, 60 degrees, and 90 degrees) to study the vortex-induced motion under the surge and sway degrees of freedom at high dimensionless reduced velocities (i.e. 6