| The development of renewable energy is becoming one of the important topics in the current society.The ocean accounts for 71% of the earth's surface area and contains a large amount of renewable energy,of which wave energy is an important component.The wave energy converter(WEC)has become popular field for researchers.After decades of research,many kinds of WEC have been developed,among which the oscillating-body WEC has higher energy efficiency and more flexible layout,which has become one of the hot spots in WEC research.Efficiency and reliability are the key issues in WEC research.Efficiency is used to measure how much wave energy the WEC can capture,and reliability refers to the survival ability of the WEC in extreme sea conditions.The CFD solver naoe-FOAM-SJTU based on open source software OpenFOAM and commercial software AQWA are used to study the hydrodynamic response of horizontal cylindrical oscillating-body wave energy converter based on key factors of efficiency and reliability.The physical model of the power take-off system(PTO)inside the WEC is simplified,the load of PTO is simplified as a linear damping force,and the loss of energy in conversion is ignored.The hydrodynamic performance of buoy without PTO load is studied at first.Waves2 Foam is used to generate waves with specified wave height and period,and the CFD and BEM results are compared with the experimental results,verifying the accuracy of the numerical method.The factors affecting hydrodynamic performance of buoy with PTO load are studied.The effect of diameter on the heave motion response and energy efficiency of buoy is investigated.The wave load under different PTO load is simulated and compared between CFD results and BEM results.The hydrodynamic performance of single buoy in the focused wave was studied.Pressure sensors are set on the surface of buoy to record the pressure distribution at different positions.The pressure distribution and wave load on of buoy are investigated.Finally,the hydrodynamic performance of double buoy system is analyzed and the influence of interaction between buoys on energy efficiency is studied.The effect of wave period on energy efficiency is also analyzed. |
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