© IC-SCCE A COST-EFFECTIVE METHOD FOR MODELLING AND NUMERICALLY SOLVING THE HYDRODYNAMIC BEHAVIOUR OF FLOATING UNITS SUPPORTING MULTI MOVING BODIES COMPENSATION SYSTEM

Abstract. The paper deals with the hydrodynamic aspects of floating units supporting multibodies compensation system. The multiple moving bodies (floats) operate through moonpools onboard a floating parent unit. A new cost-effective method based on linearized hydrodynamics is presented for the 3D hydrodynamic problem. The method solves numerically the integral equations resulting from the hydrodynamic formulation by considering not a number of moving bodies, but just one, the parent unit, and taking separately into account the effect of the floats ’ motion inside the moonpools, on the moving parent unit. The floats ’ motion relative to the vessel, causes the generation of waves moving outwards from the moonpools in all directions. Their contribution is taken into account in terms of the floats potential Φm represented by the use of Green’s function and the distributed wave sources method. The external mechanical forces, which the floats are subjected to, are applied through mechanical means fixed on the parent unit. The resulting reaction force is responsible for an additional motion, which generates waves moving outwards from the vessel. Their contribution is considered on the basis of an additional potential, ΦR, the reactive potential.