Analytical investigation of hydrodynamic performance of a dual pontoon WEC-type breakwater |
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| Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Computing, Engineering and Mathematics, University of Western Sydney, Locked Bay 1797, Penrith, NSW 2751, Australia;3. School of Marine Science and Engineering, Plymouth University, Plymouth PL4 8AA, UK;1. School of Hydraulic Engineering, Dalian University of Technology, China;2. School of Physics and Astronomy, The University of Edinburgh, Scotland;3. School of Ocean Science and Technology, Dalian University of Technology, Panjin, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China;2. Department of Engineering Science, Uppsala University, Uppsala, 75239, Sweden;1. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China;2. Department of Engineering Science, University of Oxford, OX1 3PJ, United Kingdom;3. Department of Architecture and Civil Engineering, University of Bath, Bath BA2 7AY, United Kingdom;1. College of Shipbuilding Engineering, Harbin Engineering University, Harbin, 150001, China;2. College of Engineering, Mathematics and Physical Sciences, Exeter University, Cornwall, TR10 9FE, UK |
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| Abstract: | Based on the linear potential flow theory and matching eigen-function expansion technique, an analytical model is developed to investigate the hydrodynamics of two-dimensional dual-pontoon floating breakwaters that also work as oscillating buoy wave energy converters (referred to as the integrated system hereafter). The pontoons are constrained to heave motion independently and the linear power take-off damping is used to calculate the absorbed power. The proposed model is verified by using the energy conservation principle. The effects of the geometrical parameters on the hydrodynamic properties of the integrated system, including the reflection and transmission coefficients and CWR (capture width ratio, which is defined as the ratio of absorbed wave power to the incident wave power in the device width). It is found that the natural frequency of the heave motion and the spacing of the two pontoons are the critical factors affecting the performance of the integrated system. The comparison between the results of the dual-pontoon breakwater and those of the single-pontoon breakwater shows that the effective frequency range (for condition of transmission coefficient KT < 0.5 and the total capture width ratio ηtotal > 20%) of the dual-pontoon system is broader than that of the single-pontoon system with the same total volume. For the two-pontoon system, the effective frequency range can be broadened by decreasing the draft of the front pontoon within certain range. |
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| Keywords: | Linear potential flow theory Floating breakwaters Wave energy extraction Effective frequency range |
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