Dear NREL Community
I would like to investigate dynamic stall on a new wind turbine as part of a scientific project at the University of Hannover.
In doing so, I would like to insert the polar information (aoa, cl,cd,cm) from the studied airfoil of the rotor blade into my Aerodyn-setup.
With CFD simulations I calculated the polar information for a range from 10 to 40 aoa (beacause the dynamic separation is assumed at about 17°).
Now the question is how to integrate the generated polar information of the CFD into my Aerodyn setup, i.e. into the Aerodyn15_Polar.dat file. Also, I wonder if I need more CFD results to create a more accurate cl-aoa plot.
My methodology so far is as follows:
- convert csv-file of raw data into dat-file
- take into account 3D stall effects through Airfoilpreppy.
- extrapolate by Airfoilpreppy from -180° to 180°.
- save the new polar data in a new csv-file
- create Aerodyn15_Polar.dat file by Examlpe5_Writepolar.py code from Demo-python-toolbox
In step 5) I determine the unsteady parameters (like alpha0, cn or cn_lin) which are important to apply at the unsteady aerorodynamis models to predict dynamic stall.
My question are: Is the methodology plausible? Am I missing any step? Could I add a step to get better results? Are more CFD needed for an accurate result?
I am very grateful for any help!
Cheers
Jason