Absorption of wave energy may be considered as a phenomenon of interference between incident and radiated waves generated by an oscillating object; a wave-energy converter (WEC) that displaces water. If a WEC is very small in comparison with one wavelength, it is classified as a point absorber (PA); otherwise, as a 'quasi-point absorber'. The latter may be a dipole-mode radiator, for instance a...

Wave energy converters (WECs) usually require reactive power for increased levels of conversion, resulting in the need more complex take-off (PTO) units, compared to WECs that do not power. A WEC without produces much less energy, though. The concept Variable Shape Buoy Energy Converters (VSB WECs) is proposed allow continuous shape-change aiming at eliminating power, while converting a high le...

Cyclorotor-based wave energy converters (WECs) present a relatively new and innovative paradigm for harvesting. Their operational principle is based on the generation of lift forces rotating hydrofoils due to their interaction with wave-induced circulation water particles. As result, little known about optimal operation. To date, cyclorotor device performance has been measured by power waves ra...

Many nations have expanded their national energy portfolio to ameliorate the effects of climate change and to ensure the security and certainty of energy availability. These efforts have led to scrutiny of marine renewable energy (MRE) as one of several viable new renewable energy sources. In addition to the need to prove the reliability and efficiency of current and wave energy converters, eff...

This presentation describes work undertaken as part of INNOVATE UK funding led by Witt Energy Ltd to investigate the efficacy of a novel design of wave energy converter (WEC). A sealed spherical hull is floating on the surface of the water (Fig. 2(b)) and is moored to the sea bed under a four point catenary mooring system. A mechanical device known as the WITT (Fig. 1) is housed within the hull...

The high efficiency performance of the Edinburgh Duck wave energy converter (WEC) in 2D regular wave tests makes it a promising wave energy conversion scheme. A solo Duck WEC will be able to apply the point absorber effect to further enhance its performance. Since released degree of freedom will decrease the efficiency, a Duck WEC with fixed pitching axis will be a better option. However, for f...

Fossil Fuels are always considered as environmental pollutants. On the other hand, the political and economic situations highly affect the price of these fuels. Offshore wind and wave, as renewable energy sources, represent the better alternatives for electricity generation. Therefore, it is necessary that wind speeds effectively be estimated due to the absence of field measurements of the wind...

Reproducibility advances science and de-risks engineering. In ocean wave energy, developing energy converters (WECs) requires model test experiments, but there is limited knowledge on the consistency of results if an experiment reproduced in multiple basin laboratories. To better understand reproducibility WEC particular laboratory effects, we a 1:30 scale case study two This paper compares bet...

Abstract The latching control represents an attractive alternative to increase the power absorption of wave energy converters (WECs) by tuning phase oscillator velocity excitation phase. However, increasing amplitude motion floating body is not only challenge obtain a good performance WEC. It also depends on efficiency take-off system (PTO). This study aims address actual and operation heaving ...

For a weak point source or dipole, or a small body operating as either, we show that the power from a wave energy converter (WEC) is the product of the particle velocity in the waves, and the wave force (suitably defined). There is a thus a strong analogy with a wind or tidal turbine, where the power is the product of the fluid velocity through the turbine, and the force on it. As a first appro...