Dear Jason,
Where can I check if the aerodynamic data table (angle of attack lift drag coefficient) of the IEA10MW airfoil provided by Openfast is compressible or incompressible, or is it measured data?
Best regards,
The airfoil polar data originates in the IEA Wind 10-MW repository. You can see the polars documented here in the yaml-based, WindIO file. See the description field that says:
FFA-W3-211 (Re=1.00e+07)FFA-W3 airfoil data for 10 MW sized rotor, computed using EllipSys2D v16.0, 70% free transition, 30% fully turbulent, 360 deg extrapolated using AirfoilPreppy, no 3D correction. F Zahle, DTU Wind Energy 11 May 2017
Info about EllipSys2D is available here (it is incompressible).