fan boundary condition and angle of attack
 

I am using the boundary condition fan in fluent 2020 R1 to analyze the rotation of the fan immersed in a current at angle of attack alpha 4, in fact the input speed has the components vx = v * cos (4) and vz = v * sin (4) since the reference system is such that the x axis is coincident with the axis of rotation of the fan, z upwards and ya left, as can be seen from the draft.
I want the fan rotation axis to be in the x direction and in the fluid panel I set (1,0,0) for rotation axis direction and (0,0,0) for origin. I still don't understand why the contour produces a different tangential velocity profile than what I expect. Is it influenced by the angle of attack? how can I solve this problem?


Attachment 88478

actual problem description is not clear

You can try rotating the surface for fan boundary condition to the desired angle of attack while keeping the inlet condition at 0 deg AoA.