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The study about technologies and operational principles of devices to convert wave energy into electrical one (WEC) has increased significantly. Among the studied WECs it is possible to mention the overtopping device. Its main operational principle consists on a ramp which guides the incoming waves into a reservoir raised slightly above the sea level. The accumulated water in the reservoir flows through a low head turbine generating electricity. In the present work it is performed a numerical study concerned with the effect of ramp geometry over the performance of an onshore overtopping device in real scale by means of Constructal Design. The main purpose here is to evaluate the ratio between the height and length of ramp ( H 1 / L 1 ) which maximizes the amount of water that enters into device reservoir for one specific distance from the bottom of the tank to the bottom of device of S = 6.0 m. In the present simulations, the conservation equations of mass, momentum and one equation for the transport of volumetric fraction are solved with the finite volume method (FVM). To tackle with water-air mixture, the multiphase model Volume of Fluid (VOF) is used. Results showed that the best shapes were achieved for the lowest ratios of H 1 / L 1 for the evaluated depth, contrarily to what was observed in previous studies of literature for a device in laboratory scale in the middle of a wave tank mimicking an offshore overtopping device.

Constructal Design de um dispositivo de galgamento onshore em escala real para uma profundidade fixa