Parametric investigation involving response reduction for a semi-submersible floater with shape alteration, stepping, and tilting of columns and pontoons

Numerical investigation was carried out to analyze the hydrodynamic response of 4-column semi-submersible floaters, incorporating variations such as stepping and alterations in the shape/geometry of columns and pontoons, as well as tilting of main columns. Utilizing Ansys-AQWA, a hydrodynamic software based on panel method, simulations were executed for these scenarios. The simulations yielded insights into responses, excitation forces/moments, and pressure on the structure, facilitating a comparison between the models through a parametric study. It was observed that stepping of pontoons and tilting of columns led to reduced responses, forces, and pressures, reaching balance through appropriate stepping and tilting. Additionally, altering the geometry of columns and pontoons indicated the potential benefits of employing elliptical pontoons and pentagonal columns for enhanced response control.