Research On Motion Response Of Floating Offshore Wind Turbine Under The Action Of Wind,Wave And Current

At present,floating offshore wind turbine(FOWT)is developing in the direction of large-scale,deep-sea and high-power.In the process of developing into the deep sea,the marine environment it faces is becoming more and more complex,so the study of the motion performance of FOWT has received more and more attention.At the same time,with the rapid development of computer technology,high accuracy can also be obtained by studying the movement of FOWT through numerical simulation technology.Therefore,this paper will explore the motion response and load characteristics of FOWT under different marine environment conditions based on the open-source CFD software platform Open FOAM,and the main research contents include:(1)Based on the viscous flow theory,the piston wave technology in ola Flow wavemaking tool was used to analyze the convergence of the mesh scheme and time step setting of the numerical wave tank,and the effectiveness of regular wave simulation and freak wave simulation was verified in the numerical wave tank.(2)In order to study the motion response of FOWT under the coupling of wind wave and current,this paper verifies the motion response of structures under the separate action of wind and wave currents.In this paper,three typical test cases are selected to carry out the lift coefficient of NERL S810 airfoil in air,the movement of simple shape float under the action of water waves,and the vortex-induced vibration amplitude of cylinder under the action of water flow,and compare the numerical simulation results with the test results.(3)Finally,the motion performance of FOWT under the combined action of wind wave and current is studied,in which there is no theoretical model of "unified field" of wind wave and current because the coupling of wind wave and currents is a complex process.In this paper,the motion response of FOWT is analyzed by superposition of wind wave and current inputs.The motion performance of FOWT under the combined action of regular wave wind and current was studied.The motion performance of FOWT under the combined action of freak wave wind and current was studied.At the same time,the implementation process of FOWT under the combined action of freak wave wind and current is given in the appendix.