Numerical results of the dynamic response and capture factor of the two-raft-type WEC

The most typical example of raft -type wave energy converters (WECs) is a system consisting of two hinged cylinders. It utilizes the relative rotation between these floats to operate a Hydraulic Power Take -Off (HPTO) mechanism, enabling the extraction of power from ocean waves. The present work discusses the hydrodynamic/ dynamic assessment and power capture capability of the WEC with the two -raft -type design, employing the boundary element method (BEM) and computational fluid dynamic (CFD) method. The rotational and linear HPTO model of the hinged floats are employed in coupled software of the ANSYS/AQWA and STAR-CCM+, which allows us to execute the time domain analysis (TDA). The present numerical results are validated by comparing them to previously published findings for two linked barges without a damping coefficient. Then, four different non -dimensional parameters of two -raft -type WECs and operating environmental conditions are examined, differing in their diameter -to -length ratios (D/L = 0.1, 0.15, 0.2, and 0.25), wave periods (T), amplitudes (A), rotational (alpha r) and linear (alpha l) damping coefficient. The results of the dynamic response, capture factor (CF) and power generation capabilities of the devices under different damping coefficients and an extensive range of regular wave characteristics are presented and discussed.