Aerodynamics code used in Wind Energy Science paper "Comparison of a coupled near- and far-wake model with a free-wake vortex code"

This research code has been developed from the start of my PhD as a first step before the HAWC2 implementation of the near wake model.

It can be used to make aerodynamic computations of a stiff wind turbine rotor, and it includes

• A BEM and far wake model implementation based on the one in HAWC2
• An attached flow unsteady airfoil aerodynamics model including the modifications described in the WES article
• Most importantly a near wake model implementation including all major modifications except the recent stand still extension presented at TORQUE 2016

All the data files need to be in a subfolder 'NREL_5MW' located in the same folder as the compiled source code.

With the present (hardcoded) settings, the program will simulate the NREL 5 MW reference turbine for 650 seconds, with blade vibrations according to different prescribed mode shapes after steady state is reached. The aerodynamics model is a coupled near and far wake model. The integrated aerodynamic work during 1 period of the different prescribed vibrations will be output in the file 'aerowork.out' .

The NREL 5 MW turbine is described in:

Jonkman, J., Butterfield, S., Musial,W., and Scott, G.: Definition of a 5-MW Reference Wind Turbine for Offshore System Development, National Renewable Energy Laboratory, 2009.