Dear @Yangyang.Li,
I’m not following all of your calculations, but just a couple comments:
- The hub coordinate system used by AeroDyn differs from the hub coordinate system used by ElastoDyn, the latter of which is documented in the old FAST v6 User’s Guide that you reference. While the ElastoDyn hub coordinate system is tied to the azimuth angle of blade 1, the hub coordinate system used by AeroDyn is tied to the inflow-skew angle, as discussed in the following forum topic: Azimuth Angle of the Blade. ← This is not correct; see my post dated Aug 2, 2024 below.
- Given that coned axis is not aligned with the hub z axis, the flow normal to the coned axis (x) will also contribute to flow along the hub x axis.
Best regards,