Numerical analysis of internal flow in the wave-energy converter by CFD and MATLAB codes

Wave power generator uses the surface water displacement as an energy source. The pitching motion of the device causes a column of water to rise and fall periodically in the double-hull housed caisson, creating a bi-directional flow. A cross-flow turbine uses this bi-directional flow for self-start and causes the rotation of turbine in a single direction. The turbine does not have direct contact with sea water, as the working fluid used is fresh water. So, the system is free from bio-fouling and hence easier to maintain. A small opening is provided in the system which serves to check the pressure built up inside the double-hull due to water motion. The power conversion system in this device is a buffered system in which the working fluid uses the wave energy to rotate the turbine, and then transfers energy to the generator. As we know, the numerical analysis using CFD requires a lot of time and resources thus to compensate this, MATLAB was used. Using predictable inner flow model, results obtained from both CFD and MATLAB were analyzed and compared. Similarly, PTO performance of the wave-power generator was also analyzed and compared for both CFD and MATLAB. The results obtained from this analysis can be further applied for various scale models.