The offshore wind energy presents a good solution for the green energy demand.The floating offshore wind turbine(FOWT)is one of the most potential choices of the basement construction for offshore wind turbines in deep water.Hydrodynamic performance of multi-column tension-leg-type floating wind turbine is investigated numerically,particularly at its motion responses.Based on the Navier-Stokes equations and the volume of fluid method,a numerical wave tank(NWT)is established to simulate the floating structure system.The analytical relaxation method is adopted to generate regular waves.Dynamic mesh method is used to calculate the motion of the floating body.Hydrostatic decay of motion and hydrodynamic forces in the regular wave are provided.The computation results agree with the experimental data available.Numerical results show that the wave force on the lower pontoon of the system is the greatest while that on the center column is the smallest.Detailed information about the changes of the wave forces on different elements of the floating system is discussed. The offshore wind energy presents a good solution for the green energy demand. The floating offshore wind turbine (FOWT) is one of the most potential choices of the basement construction for offshore wind turbines in deep water. Hydrodynamic performance of multi-column tension-leg -type floating wind turbine is investigated numerically, particularly at its motion responses. Based on the Navier-Stokes equations and the volume of fluid method, a numerical wave tank (NWT) is established to simulate the floating structure system. adopted to generate regular waves.Dynamic mesh method is used to calculate the motion of the floating body. Hydrostatic decay of motion and hydrodynamic forces in the regular wave are provided. The computation results agree with the experimental data available. Numerical results show that the wave force on the lower pontoon of the system is the greatest while that on the center column is the smallest.Detailed information about the changes of the wave forces on different elements of the floating system is discussed.