  Aerodynamic noise is a limitation for further exploitation of wind energy
resources. As this type of noise is caused by the interaction of turbulent flow
with the airframe, a detailed resolution of the flow is necessary to obtain an
accurate prediction of the far-field noise. Computational fluid dynamic (CFD)
solvers simulate the flow field but only at a high computational cost, which is
much increased when the acoustic field is resolved. Therefore, wind turbine
noise predictions using numerical approaches remain a challenge. This paper
presents a methodology that couples (relatively fast) wind turbine CFD
simulations using actuator lines with a fast turn-around noise prediction
method. The flow field is simulated using actuator lines and large eddy
simulations. The noise prediction method is based on the Amiet-Schlinker's
theory for rotatory noise sources, considering leading- and trailing-edge noise
as unique noise sources. A 2D panel code (XFOIL) calculates the sectional
forces and boundary layer quantities. The resulting methodology for the noise
prediction method is of high fidelity since the wind turbine geometry is
accounted for in both flow and acoustics predictions. Results are compared with
field measurements of a full-scale wind turbine for two operational conditions,
validating the results of this research.
