Dear Arash,
Read the above posts again. In AeroDyn v15, the blade azimuth is not guaranteed to be defined such that it is zero degrees for a blade pointing upward; instead, the azimuth in AeroDyn v15 is defined relative to the inflow skew angle.
You haven’t mentioned anything about your turbine configuration or inflow condition. For the image pasted in the Sep 29, 2016 post above, if theta > 0 and gamma = 0, then x_disk would be defined along the shaft nominally downwind, y_disk would be defined in the rotor plane, nominally upward, and z_disk would be defined in the rotor plane nominally to the left when looking downwind. Then, the azimuth angle would be such that a blade pointing nominally upward has a 90-degree azimuth and a blade pointing nominally downward has a -90 degrees azimuth, which is what you are describing.
I hope that helps.
Best regards,