A MODELING OF MOORED SHIP MOTIONS ON MULTI-DIRECTIONAL IRREGULAR WAVES BASED ON CADMAS-SURF/3D

Abstract

 In calculation of motions and forces of ship moored to a berth equipped in an oceanic island which is surrounded by much steep bathymetry from deep to shallow water, directional spreading and nonlinearity of offshore wave should be taken into account because the berth is not sheltered from them. In order to realize such calculation, a modeling of moored ship motions is conducted with expanding the CADMAS-SURF/3D, which is one of the computed fluid dynamics (CFD), to both the generation of deformed multi-directional irregular waves and the consideration of moored arbitrary shaped floating body. In this study, a coupling the CADMAS-SURF/3D with the NOWT-PARI, which is one of the Boussinesq-type wave transformation model, is conducted in order to reduce the calculation capacity and generate the deformed multi-directional irregular waves in the expanded CADMAS-SURF/3D. In this model, The moored floating body is expressed with porous media and moved by buouancy, mooring and external nonlinear wave forces.