On the surge-induced aerodynamic response of a floating offshore wind turbine with wind shear inflow consideration

Journal article, 2026

The combined effect of platform surge and wind shear triggers intense aerodynamic load and power oscillations of floating offshore wind turbines (FOWTs), impairing operational stability and power yield. This work constructs a high-fidelity three-dimensional numerical model via the improved Delayed Detached Eddy Simulation (IDDES) to reveal transient aerodynamic mechanisms under coupled inflow-surge conditions, and proposes a trigonometric decoupling prediction model for aerodynamic coefficients to improve load forecasting precision. Key quantitative conclusions are drawn: Thickened wind shear layers raise the mean power coefficient CP by 2.9% and mean thrust coefficient CT by 16.7%, alongside amplified instantaneous load fluctuations; Enlarged surge amplitude magnifies instantaneous CP oscillations to 2.06 times those under small-amplitude motion, while shorter surge periods boost fluctuation magnitudes of both CP and CT yet lower their time-averaged values; Decoupling decomposition confirms surge-driven load variations are dominated by viscous damping components, with wind shear thickness, surge amplitude and period jointly regulating the mean level and oscillating intensity of aerodynamic loads. This research offers theoretical support for load prediction, performance optimization and fatigue mitigation of FOWTs in complex marine flow environments.