In the present study, OpenFOAM has been extended for modelling hydrodynamic performance of a flap-type wave energy converter in viscous flow. The numerical results of the OpenFOAM model have been compared with analytical results based on linear potential flow theory. The effects of nonlinearity and viscosity on the wave-induced motion of the oscillating flap are studied as well as the energy absorbing capacity of the device. Parametric analysis has been performed to investigate the dependence of the hydrodynamics of the device on the power take-off system

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