Simulation study reveals aerodynamic performance and dynamic stall limits in floating offshore wind turbines under platform motions, highlighting engineering model capabilities.
Key Points
To systematically evaluate the performance and limitations of the Beddoes-Leishman and Øye dynamic stall models for floating offshore wind turbines undergoing pitch, surge, and coupled motions.
Evaluated Beddoes-Leishman and Øye dynamic stall models for an NREL 5 MW floating offshore wind turbine undergoing pitch, surge, and coupled motions at 0.1 Hz.
Benchmarked blade element momentum and free-vortex wake methods against high-fidelity computational fluid dynamics (CFD).
Supplied CFD-derived sectional aerodynamic data into dynamic stall models to assess and improve sectional load predictions.
Under rated operating conditions, maximum deviations from CFD reference values reached 4.4% for aerodynamic power and 8.63% for thrust, with the Beddoes-Leishman model outperforming the Øye model.
Small-amplitude platform motions confined flow separation to the inner 30% of the blade span, whereas a 4° pitch amplitude induced extensive flow separation across the entire blade.
Coupled pitch-surge motions generated larger power and thrust fluctuations than single-degree-of-freedom motions, exhibiting nonlinear flow-separation behavior.