Investigation on Reflected Wave by Different Geometrical Ramp Shape of Overtopping Break Water for Energy Conversions Using Experimental and Simulation

Abstract

Innovation trends on the development of breakwater have prolong its functionality from coastal protection to harness wave energy. One of the latest structural being study is the overtopping breakwater for the energy conversion which integrate breakwater with wave energy converter. An impact of linear ramps on reflection of the structural been studied in detail in some previous researches and create opportunity in exploring vast scope of study including the ramp shape. Therefore, intention of this study is to experimentally investigate the effectiveness of various geometrical ramp shapes of the structural toward the reflected wave. In addition, simulation was conducted and compare with the experimental result to ensure the agreement of the outcomes. This study used different wave parameters and effect of relative depth (Hm0/h) to acquire data on the behaviour of the reflected wave that describe the effectiveness of the structure. The findings of this study in the experimental work indicates that the cubic ramp shape precedes the linear ramp with 21.5% more efficient under certain wave conditions. Besides, this study additionally reveals similarities in both methods and conclude that ramp shape has significant influence on the reflection of the wave from the structure and the highest percentage of discrepancy for the CFD is 22.3%. However, the contribution of the different ramp shape is absent at the maximum depth but significantly affect as well as the depth decrease.