The paper presents a numerical investigation of the wave-structureinteraction using a hybrid model, qaleFOAM, which combines a twophaseNavier-Stokes model (NS) and the fully nonlinear potential theory(FNPT) using the spatially hierarchical approach. The former governs alimited computational domain (NS domain) around the structures, wherethe viscous effects may be significant, and is solved by usingOpenFOAM/InterDyMFoam with a modified solver for the six degreesof-freedom (6DoF) motions of rigid bodies. The latter covers the rest ofthe domain (FNPT domain) and is solved by using the Quasi LagrangianEulerian Finite Element Method (QALE-FEM). In the numericalsimulation, the incident wave is generated in the FNPT domain using aself-correction wavemaker and propagates into the NS domain throughthe coupling boundaries (inlet of the NS domain). An improved passivewave absorber is imposed on the outlet of the NS domain for the waveabsorption, whereas a new module for solving six-degree-of-freedomstructural motions is also applied. The accuracy of the qaleFOAM onmodelling wave-structure interaction is preliminarily investigated interms of both the wave propagation and the responses of the structures.Finally, the qaleFOAM is applied to the CCP-WSI Blind Test and someresults are presented for demonstrations.
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