Dear Jonkman,
Thanks you very much, your answer was very helpful!
Yes, I am using TurbSim-generated inflow.
I wasn’t using the OpenFAST toolbox scripts; I adapted some scripts I wrote myself for this case.
Initially, I had considered both approaches in my mind, but the possibility of undesired smoothing of turbulence intensity (or preference for 0, +/-90, or 180) escaped me. I chose the PropagationDir approach (as discussed in Wind farm modeling by using FAST and TurbSim - #15 by Shubham.Baisthakur ) because it felt more direct for calculating fatigue at specific points at the tower base, since the tower reference frame does not change with wind direction.
I’ll now explore the second option, rotating the (X,Y) turbine coordinates. When computing tower base fatigue, I’ll make sure to carefully convert the angles, since a specific fiber (angle) in the tower would correspond to a different one when Y is different.
Best regards,
Tiago Lucas