To address the unclear transfer mechanisms among the multi-field and multi-scale coupled dynamic responses of floating wind turbines under wind-wave coupling conditions

this paper conducts fully coupled aero-hydro- mooring simulations using the STAR-CCM+multi-physics platform. Numerical approaches include the dynamic fluid-body interaction

overset grids

the volume of fluid method

and the improved delayed detached eddy simulation model. The work explores the inherent correlations among motion responses

aerodynamic loads

and wake evolution. Results reveal that the power spectral density of motion responses decays with an f-2 scaling

and unique coupling effects exist among different degrees of freedom. Wave surface variations induce periodic fluctuations in the wind velocity above the sea surface. Inflow wind speed and multi-degree- of-freedom motions jointly govern the dynamic behavior of the turbine. The wake of the floating wind turbine oscillates alternately

with the spacing between adjacent tip vortex rings gradually increasing to approximately 0.5 wavelengths

corresponding to twice the wave frequency. The wake is intermittently enhanced with intensified wake meandering and accelerated recovery. Additionally

the power spectral densities of aerodynamic thrust and torque exhibit piecewise cross-scale decay following power laws from f-8/3 to f-11/3 in the high-frequency domain. The obtained results can serve as a theoretical reference for the layout design and operational control of floating wind farms.