Hello,
I hope this message finds you well. I would like to use the wind tunnel test data provided in the technical report for IEA Task 29 Mexnext. However, I have been unable to locate the aeroelastic code for this model. Is it open-source? If so, could you please provide me with the GitHub link or direct me to where I can access it?
I want simulation results from the MEXICO wind tunnel test, including:
The MEXICO power coefficient and axial force coefficient.
The MEXICO flapwise fatigue-equivalent blade root bending moment at different yaw angles.
The MEXICO normal force variation as a function of azimuth angle.
I want to conduct a simulation for the NREL 5MW wind turbine, but I am unsure if I can compare the NREL 5MW wind turbine model simulation results with the MEXICO wind tunnel test data.
Q1: By setting the same tip speed ratio for my model, can I use the NREL 5MW wind turbine model simulation results to validate them against the MEXICO wind tunnel measurements?
The NREL 5-MW baseline wind turbine is not the same turbine as used in the MEXICO wind tunnel tests (even when considering consistent scaling in rotor size), so, ānoā, you wouldnāt be able to reasonably compare the results between the two.
For the MEXICO data, I would ask Gerard Schepers of TNO.
I was not involved in the MEXICO phase of IEA Wind Task 29 (MexNext) and donāt have an OpenFAST model of that turbine to share. There could be an OpenFAST model that has been developed of this turbine by someone, but Iām not sure who would have it. Again, this is probably a better question for Gerard Schepers. If you have the properties of this turbine, you could also put together the OpenFAST model yourself.
I have asked Prof. Gerard Schepers for the OpenFAST model but havenāt received a reply yet. Although I couldnāt obtain the detailed properties of the tower (mass, stiffness, size), blade (mass, stiffness, size), or the nacelle (size and mass), the airfoil families utilized along the turbine blade span have been provided. They are as follows:
DU 91-W2-250 at the root of the blade;
RISĆ A1-21 at mid-span;
NACA 64-418 at the outer part of the blade.
I have a few questions about this:
Could these airfoils (DU 91-W2-250, RISĆ A1-21, NACA 64-418) provide the same aerodynamic drag and lift force as those used in the NREL 5 MW wind turbine blade?
These airfoils all differ a bit from the airfoils used in the NREL 5-MW baseline wind turbine, so, the airfoil data will differ as well. Besides, the airfoil data provided with the FAST / OpenFAST models of the NREL 5-MW baseline wind turbine include corrections for 3D rotational augmentation (stall delay) that is only valid for a given rotor.
I have a few question on Standalone AeroDyn output symbols
Regarding the AeroDyn output symbols BĪ±NĪ²Fx, BĪ±NĪ²Fy, BĪ±NĪ²Fn, and BĪ±NĪ²Ft, Iām unable to use them directly in the AeroDyn output section. How to properly implement them?
What is the correct symbol for the blade root flapwise moment in standalone AeroDyn?
Regarding (1), you should replace BĪ± with the blade number, i.e., B1, B2, or B3 for blades 1, 2 or 3 and you should replace NĪ² with the output node number, i.e., N1, N2, ā¦ up to N9 (assuming NBlOuts = 9. Node N1 corresponds to the 1st node entered in the BlOutNd list, node N2 corresponds to the 2nd node in the list, etc., up to NBlOuts output nodes.
Regarding (2), the total integrated aerodynamic load along the blade expressed in the blade-root coordinate system for blade BĪ± are AeroDyn outputs BĪ±AeroFx, BĪ±AeroFyBĪ±AeroFz for the forces, and BĪ±AeroMx, BĪ±AeroMy, BĪ±AeroMz for the moments.
Dear Jason,
Thank you for your detailed information. I have set tangential and normal forces according to the these explanation and that solves the issue. However, the simulation cases are getting aborted for blade-root loads out put channels, i.e,
It looks like you are using a quite old version of the standalone AeroDyn driver; these blade-root aerodynamic outputs were added more recently. Youāll have to upgrade to use these outputs.
Thank you for your time and guidance. The results I obtained for tangential force (Ft) and normal force (Fn) using an older version of standalone AeroDyn are comparable to the experimental results from the MEXICO model. I would like to continue using this older version of AeroDyn. Could you please clarify the following:
In the older version, are the equivalent outputs for the forces BĪ±AeroFx, BĪ±AeroFy, and BĪ±AeroFz represented as RtAeroFxh, RtAeroFyh, and RtAeroFzh, respectively?
Similarly, are the moments BĪ±AeroMx, BĪ±AeroMy, and BĪ±AeroMz equivalent to RtAeroMxh, RtAeroMyh, and RtAeroMzh?
Iād appreciate your confirmation or any corrections if Iāve misunderstood the mapping between these outputs.
The integrated loads on a single blade were added to AeroDynās OutList only recently. AeroDyn outputs RtAeroFxh, etc. are the total integrated loads across the entire rotor.