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Experimental and numerical investigation on wave height and power take–off damping effects on the hydrodynamic performance of an offshore–stationary OWC wave energy converter

Elhanafi, A ORCID: 0000-0001-7866-9036 and Kim, CJ 2018 , 'Experimental and numerical investigation on wave height and power take–off damping effects on the hydrodynamic performance of an offshore–stationary OWC wave energy converter' , Renewable Energy, vol. 125 , pp. 518-528 , doi: 10.1016/j.renene.2018.02.131.

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Abstract

Wave energy is a viable source of ocean renewable energy and research is being conducted worldwide. The Oscillating Water Column (OWC) device is recognised internationally as one of the most promising types of ocean Wave Energy Converters (WECs). To effectively utilize ocean waves for harvesting more energy, offshore OWC devices need to be deployed in deep–water where waves are more energetic. Therefore, the present paper experimentally investigated the hydrodynamic performance of a 3D offshore–stationary OWC device subjected to a wide range of regular wave conditions of different periods and heights and nonlinear power take–off (PTO) damping conditions simulated by an orifice. The experimental results were also employed to validate a 3D incompressible Computational Fluid Dynamics (CFD) model based on the RANS–VOF approach. It was found that the device capture width ratio decreased as wave height increased, especially for wave frequencies higher than device resonance frequency. However, for low–frequency waves under small PTO damping, there was a noticeable improvement in the device capture width ratio. More importantly, results of this study revealed that even with the changes in the device capture width ratio as wave height doubled, the OWC device could extract more wave energy throughout the whole frequency range tested by a maximum of about 7.7 times, particularly for long waves under small PTO damping. Furthermore, the numerical results from the 3D CFD model were in good agreement with the experiments, while the 2D model provided misleading (overestimating) results for high–frequency waves.

Item Type: Article
Authors/Creators:Elhanafi, A and Kim, CJ
Keywords: Wave energyOffshore oscillating water column deviceOWC3D experiments and CFDPTO damping effectWave height effect
Journal or Publication Title: Renewable Energy
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 0960-1481
DOI / ID Number: 10.1016/j.renene.2018.02.131
Copyright Information:

Copyright 2018 Elsevier Ltd.

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