NUMERICAL ANALYSIS OF THE WATER LEVEL CHANGE ON THE OVERTOPPING WAVE POWER GENERATOR

In Japan, the energy source for power generation depends mostly on foreign countries. Therefore, it is necessary to secure stable energy resources in our country. Wave energy has a very large amount of energy (Masuda 2008, Hiromichi et al. 2016, Tanaka et al., 2016). In this research, thermal fluid analysis software was used to numerical calculations to reproduce the hydraulic characteristics, the breaking wave and the overtopping wave. For wave power generation, there is an advantage that resources that are semi-permanent waves can be used. The structure of the overtopping wave power generator was mainly wall type and no-wall type under wave run-up slope area. At first this research, we summarize the types and characteristics of power generation methods using ocean energy. At second we focused on the extraction of unused wave energy and the overtopping wave power generation which can be effectively utilized. Numerical analysis of regulated waves was carried out to reproduce the hydraulic characteristics such as the behavior of the run-up, the catchment and the breaking wave and the transverse wave in the local quantity by using the thermo-fluid analysis software. Then the results of the breaking wave, the transient phenomenon for various wave conditions reproduction, and overflow wave flow rate were calculated. The overtopping flow rate and water storage rate were very important factors in such systems. Numerical calculation of regular waves on the influence of shape difference on overtopping flow rate and water storage rate were carried out. At third, to simulate actual sea conditions irregular waves were made for calculation. These results were compared with calculations of regular waves. At final, numerical calculation using regular waves and irregular waves showed that the influence of the difference in the shape of the structure on the maximum water overtopping storage rate. It was necessary to devise a structure that can be efficiently overtopped by irregular waves.