Prediction of the hydrodynamic performance of the floating pendulum wave energy converter in regular and irregular waves

Abstract

In this paper, we carried out a numerical investigation of the hydrodynamic performance of a floating pendulum wave energy converter (WEC). This movable-body-type device consists of three main parts: floater, pendulum and damping plate. The performance of the WEC device was evaluated under regular and irregular wave conditions using frequency-domain floating body dynamics. In this study, the higher-order boundary element method (HOBEM) based on potential flow model was applied to obtain the hydrodynamic coefficients and wave exciting forces acting on floating bodies. The hinged motion of the pendulum was simulated by applying the penalty method. In order to avoid an unrealistic resonant response, numerical body damping was adopted. The coupled dynamics of floater and pendulum were analyzed as a hinged multi-body model. First, the wave force and motion characteristics of the device in regular waves were studied. Then, the performance of the WEC device was evaluated under irregular wave conditions. The effects of the main shape parameters on power absorption and floater motion were numerically investigated. Copyright ？ 2012 by the International Society of Offshore and Polar Engineers (ISOPE).