Effects of Second-Order Difference-Frequency Wave Forces on Floating Wind Turbine Under Survival Condition |
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| Authors: | Jiawen Li Yichen Jiang Yougang Tang Xiaoqi Qu Jiawei Zhai |
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| Institution: | 1.State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin,China;2.Department of Mechanical Engineering,University of California at Berkeley,Berkeley,USA |
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| Abstract: | In this paper, the effects of second-order difference-frequency wave forces on the global motion of an offshore wind turbine system with a large displacement under the survival condition are studied. In this case, the hydrodynamic force is the main force because the blades are feathered to reduce the lifting force. The first-order hydrodynamic forces are calculated by WADAM, while the second-order wave forces are calculated by a customized MATLAB module. Then the hydrodynamic coefficients are transferred to the wind turbine analytical code FAST. Through the comparisons of dynamic responses between the first- and second-order numerical models, it is found that the second-order wave forces significantly influence the motion of floating wind turbine under the survival condition. Moreover, neglecting the second-order force significantly underestimates the tension forces in the mooring lines. |
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