Experimentally validated simplified prediction model of unloaded spar-buoy wave energy converter motions’ responses in waves

The main objective of this study is to develop a fast and validated model predict the motions’ responses spar-buoy wave energy converter based on oscillating water column principle. Experiments former investigations highlighted strong effect heave motion performance OWC whereas oscillations slightly affect motions. Therefore, single degree freedom was adopted simulate structure’s surge, heave, pitch separately. prediction straightforward task results were experimentally compared previous studies. Linear quadratic damping coefficients introduced for better agreement between measured predicted responses. In contrast, surge response more complicated as it requires consideration mooring system installation properties, while configuration not investigated since reduced-scale floating freely (un-moored). obtained from proposed using finite element method. Two different approaches used solve equation in direction considering multi-catenary system. Static approach where constant mooring-lines stiffness quasi-static reaction curves developed estimate instant resultant line tension at offsets. Load excursion full-scale device by finally validated.