Experiments regarding vortex-induced motions (VIM) of floatingcircular cylinders with low aspect ratio, ğ¿/ğ· = 2.0, and different heaveplate configurations were carried out in a recirculation water channel;where ğ· is the diameter and ğ¿ is the submerged length of the cylinder.The floating circular cylinders were elastically supported by a set oflinear springs to provide low structural damping on the system. Twelvedifferent heave plate conditions were tested combining three heave platediameters, ğ·(, and four heave plate heights, ğ»(. The geometryconditions were ğ·(/ğ· = 1.2, 1.6 and 2.0, and ğ»(/ğ·=0.0, 0.2, 0.4, and0.6. Additionally, a single-cylinder case without a heave plate wasexperimented, i.e., ğ·(/ğ· = 1.0. These different heave plate conditionswere selected to promote changes in the structures shedding around thefree end of the cylinder. The aim was to understand the heave plateeffects on the VIM amplitudes. The range of Reynolds number covered3,000 < ğ‘…ğ‘’ < 24,000, and the reduced velocity ranged 2 < ğ‘‰1 < 15.The increase in the heave plate dimensions decreased the VIMamplitudes. The increase in the heave plate height decreased the dragforce. The heave plate may be a reasonable solution to mitigate the VIMof offshore single column systems and perhaps of multi-column floaters.
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