Wind turbine noise originates from two principal sources: the aerodynamic noise produced by the wind turbine blades and the mechanical noise from the gearbox and generator hosted in the nacelle. The aerodynamic component usually dominates the radiated acoustic field, and tends to further increase with ever-growing rotor dimensions. Quieter blade design is necessary to enable the sustainable deployment of wind energy in Europe.
Aero-acoustic wind turbine design is nowadays mostly performed assuming standardized atmospheric conditions, which are rarely met in the field. The H2020 UPWARDS project funded by the European Commission (Grant Agreement no 763990) aims at improving wind turbine design by accounting for more realistic weather conditions, impacting both the generation of noise and its propagation through the atmospheric boundary layer.