Abstract
A fixed dual cylindrical oscillating water column (OWC) acting as a breakwater-type wave energy converter (WEC) is proposed to harvest the wave energy effectively for shallow offshore sites. An analytical model is developed to investigate the hydrodynamic characteristics and the energy capture capacity of the cylindrical OWC device in severe waves. Based on the linear potential flow theory, the analytical solutions of the velocity potential in diffraction mode are solved by matching the Eigen-function expansion technique, and the continuous conditions of the velocity potential and fluid velocity between the computational sub-domains are involved in solving the problem for determining a solution. The proposed model is verified against the published data. The effects of the wave height, the angle of chamber clapboard and the radius of the inner and outer cylindrical column on the energy conversion efficiency are investigated in this paper. To improve the energy conversion performance and obtain a faster prediction for structural optimization of the cylindrical OWC, the geometrical parameters are further discussed in the analytical model. The results indicate that the geometrical parameters of the chamber have significant effects on the wave energy absorption efficiency. It is found that the effective frequency bandwidth of the dual cylindrical column can be broadened by improving the angle of the chamber clapboard and the inner–outer cylinder diameter ratio.
Highlights
Ocean renewable energy as one of the clean and low-carbon energies has drawn wide attention in recent years of all circles
It can be found that the proposed dual-cylinder oscillating water column (OWC) device can obviously improve the efficiency of wave energy conversion
A dual-cylindrical OWC wave energy converter integrated into a fixed caisson breakwater was investigated using analytical solutions based on the linear potential flow theory
Summary
Ocean renewable energy as one of the clean and low-carbon energies has drawn wide attention in recent years of all circles. The theoretical and experimental studies focused on the integrations of OWCs, and caisson-type breakwaters have been made. Boccotti [11,12,13] conducted the theoretical investigation associated with the caisson breakwater integrating into an OWC device, and the related experimental results showed very good agreement with the theoretical calculation. Shi et al [14] proposed a new structure of shore-type OWC integrated into the caisson breakwater and results showed that the air motion in the caisson is related to the incident wave period. Experimentally investigated the effects of different wave conditions on the hydrodynamic performance of an improved double cylinder caisson-OWC model.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
