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Improving the hydrodynamic efficiency of an offshore OWC wave energy converter through changes to the submerged depth of the OWC front face

Citation

Elhanafi, A and Fleming, A and MacFarlane, G and Leong, Z, Improving the hydrodynamic efficiency of an offshore OWC wave energy converter through changes to the submerged depth of the OWC front face, Proceedings of the Australian Ocean Renewable Energy Symposium, 18-20 October 2016, Melbourne, Victoria, Australia, pp. A25. (2016) [Conference Extract]


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Abstract

Offshore oscillating water column (OWC) device is a renewable wave energy conversion (WEC) device that is promising to extract ocean wave energy through the waves-OWC chamber hydrodynamic interactions. A good understanding of these interactions is essential for the design and optimization processes. This paper uses a 2D fully nonlinear Computational Fluid Dynamics (CFD) model solving the Reynolds–Averaged Navier–Stokes equations to investigate the hydrodynamics of an offshore OWC-WEC device. The model was previously validated in good agreement against experimental results. Utilizing the CFD model, an extensive campaign of numerical tests is performed in order to uncover the relation between a wide range of incoming wave heights and the OWC front wall draft (lip submergence). The resulting impact on the device overall hydrodynamic efficiency, reflection and transmission coefficients are analysed over eleven wave periods. The key finding is that the maximum overall hydrodynamic efficiency is achieved when the submergence of the OWC front lip is equal to the incoming wave height. Also, increasing wave height improves the device efficiency, provided the ratio of maximum wave height to lip submergence is around unity.

Item Details

Item Type:Conference Extract
Keywords:OWC, CFD
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Marine Engineering
Objective Division:Energy
Objective Group:Renewable Energy
Objective Field:Wave Energy
Author:Elhanafi, A (Mr Ahmed Elhanafi)
Author:Fleming, A (Dr Alan Fleming)
Author:MacFarlane, G (Associate Professor Gregor MacFarlane)
Author:Leong, Z (Dr Zhi Leong)
ID Code:113116
Year Published:2016
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2016-12-13
Last Modified:2016-12-13
Downloads:0

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