  This two-part paper presents the integration of the free-vortex wake method
(FVM) with an aeroelastic framework suitable to model the rotor-wake
interactions engendered by floating offshore wind turbine (FOWT) rotors in
operation. Part 1 of this paper introduces the numerical development and
validation of an aeroelastic framework. Due to a lack of experimental
aeroelastic benchmarks for FOWTs, a series of validation studies are conducted
against the rotor aerodynamic and structural performance of the National
Renewable Energy Laboratory (NREL) 5-MW reference wind turbine. Part 2 of this
paper focuses on the modeling and simulating different aeroelastic operational
conditions of FOWTs. Numerical results of the current framework capture
consistently the aerodynamic rotor performance, such as power, thrust, and
torque of wave-induced pitching FOWTs. In addition, the presented aeroelastic
framework yields additional information about the power, thrust, and torque
fluctuations due to the out-of-phase blade passing frequency and corresponding
blade deflections. The fidelity of the presented framework demonstrates, for
the first time, an FVM-based aeroelastic method capable of carrying out
investigations on rotor-wake interactions and relevant aeroelastic phenomena of
FOWTs.
