FIV Energy Harvesting from Sharp Edge Square and Diamond Oscillators

The horizontal kinetic energy of the fluid flow, from on-land wind to ocean tidal stream, is one of the most promising sources of the energy. In the field of renewable energies, power extraction from Flow Induced Vibration (FIV) of bluff bodies is a fast growing research area which has seen a great advancement over the last decade. In this study, the FIV energy harvesting potential of a sharp edge square cylinder in two different flow incidences is investigated. The square cylinder, depending on its orientation with respect to the incident flow, demonstrates VIV or galloping types of responses. The results indicate that the square cylinders with a flat side perpendicular to the flow have a galloping type of response. In contrast, the same cylinders with a sharp vertex pointing the flow (diamond configuration) show a VIV type of response. The hydroelastic efficiency of the square cylinder with resonance type of response is significantly higher than that with galloping type of response. This shows the great advantages of diamond VIV excavators over square galloping harvesters.

FIV Energy Harvesting from Sharp Edge Square and Diamond Oscillators Keywords:

Square cylinder , Diamond cylinder , FIV energy harvesting , VIV , Galloping