Investigations on 3D effects and correlation between wave height and lip submergence of an offshore stationary OWC wave energy converter |
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| Institution: | 1. National Centre for Maritime Engineering and Hydrodynamics, Australian Maritime College, University of Tasmania, Launceston, Tasmania 7250, Australia;2. Department of Naval Architecture and Marine Engineering, Alexandria University, Alexandria, Egypt;1. University of Santiago de Compostela, EPS, GICEMA, Campus Universitario s/n, 27002, Lugo, Spain;2. Department of Energy, University of Oviedo, Energy Building (EDZE), Campus de Viesques s/n, 33271, Gijón, Spain;3. Department of Energy and Fluid Mechanics Engineering, University of Valladolid, Paseo del Cauce 59, 47011, Valladolid, Spain;4. School of Marine Science and Engineering, Plymouth University, Plymouth, PL4 8AA, UK;1. LGMD - Department of Mechanical Engineering, Polytechnic National School of Algiers, 16000, Algeria;2. Laghouat University, Process Engineering Laboratory, Laghouat 03000, Algeria;1. Institute for Integrated Energy Systems, University of Victoria, PO Box 1700 STN CSC, Victoria, BC, Canada;2. Cascadia Coast Research Ltd., Victoria, BC, Canada;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, USA;1. University of Santiago de Compostela, GICEMA, EPS, Campus Universitario s/n, 27002 Lugo, Spain;2. Department of Energy, University of Oviedo, Energy Building (EDZE), Campus de Viesques s/n, 33271 Gijón, Spain;3. Department of Energy and Fluid Mechanics Engineering, University of Valladolid, Paseo del Cauce 59, 47011 Valladolid, Spain;4. School of Marine Science and Engineering, Plymouth University, Plymouth PL4 8AA, UK |
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| Abstract: | Understanding the hydrodynamic interactions between ocean waves and the oscillating water column (OWC) wave energy converter is crucial for improving the device performance. Most previous relevant studies have focused on testing onshore and offshore OWCs using 2D models and wave flumes. Conversely, this paper provides experimental results for a 3D offshore stationary OWC device subjected to regular waves of different heights and periods under a constant power take–off (PTO) damping simulated by an orifice plate of fixed diameter. In addition, a 3D computational fluid dynamics (CFD) model based on the RANS equations and volume of fluid (VOF) surface capturing scheme was developed and validated against the experimental data. Following the validation stage, an extensive campaign of computational tests was performed to (1) discover the impact of testing such an offshore OWC in a 2D domain or a wave flume on device efficiency and (2) investigate the correlation between the incoming wave height and the OWC front wall draught for a maximum efficiency via testing several front lip draughts for two different rear lip draughts under two wave heights and a constant PTO damping. It is found that the 2D and wave flume modelling of an offshore OWC significantly overestimate the overall power extraction efficiency, especially for wave frequencies higher than the chamber resonant frequency. Furthermore, a front lip submergence equal to the wave amplitude affords maximum efficiency whilst preventing air leakage, hence it is recommended that the front lip draught is minimized. |
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| Keywords: | Offshore oscillating water column OWC Experimental and CFD results Wave energy 3D effects Front and rear lip effects |
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