Numerical Simulation of the Breakwater-Ramp Design for Multistage-Overtopping Wave Energy Breakwater Hybrid Device
M. A. Mustapa1, O. B. Yaakob2, Yasser M. Ahmed3

1M. A. Mustapa, Marine Engineering Technology, Universiti Kuala Lumpur, Malaysian Institute of Marine Engineering Technology, Lumut, Perak.
2O. B. Yaakob, Mechanical Engineering, Universiti Teknologi Malaysia/ Marine Technology Center, Skudai, Malaysia.
3Yasser M. Ahmed, Faculty of Engineering, Alexandria University, Alexandria, Egypt.

Manuscript received on September 15, 2019. | Revised Manuscript received on 25 September, 2019. | Manuscript published on October 10, 2019. | PP: 5531-5538 | Volume-8 Issue-12, October 2019. | Retrieval Number: L39701081219/2019©BEIESP | DOI: 10.35940/ijitee.L3970.1081219
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Abstract: Multistage-overtopping wave energy device is an example of the overtopping concept in extracting energy from the ocean wave. The multistage opening allows the wave to overtop and stored inside the multistage reservoirs and later used for electricity generation. Previously, using concentrated V-shape-ramp on the conventional multi-reservoir Sea Slot-Cone Generator (SSG) has been proven to improve up to 67 percent in hydraulic power at the 3.5 meters of significant wave height and 9.3 meters of wave period. However, the performance begins to drop when operating at smaller wave height consisting of 2.5-meter significant wave height and 7.9 seconds of wave period. Thus, this follow-up paper presents a numerical study to improve device performance, especially at small wave height. Five breakwater-ramp designs were tested consisting of Basis, Design 1 to Design 5. The overtopping device performance was simulated using FLOW-3D CFD software. Results are presented in the form of mean overtopping discharge or potential energy stored and the total energy potential for each propose breakwater-ramp design. The numerical results show that the highest total energy potential represents as the potential power output is recorded by Design 4 and Design 5 with 63.26 and 63.05 kW respectively, compared to basis SSG device with only 29.14 kW at the wave height of 2.8 meters and a wave period of 9.3 seconds.
Keywords: Ocean Energy, Marine Renewable Energy, Wave Energy Converter, Computational Fluid Dynamic (CFD
Scope of the Article: Renewable Energy