Change rotation axis in mixer_3d

MFiX
2

In usr1_des.f at line 88:

! Rotate STL files        
        CALL Rotate_STL(is_1_group_id, 'Z', cyl_center(:), rot_angle(1))
        CALL Rotate_STL(is_2_group_id, 'Z', cyl_center(:), rot_angle(2))

In this example the rotation is happening around the Z axis, and 'Z' is the second argument to Rotate_STL. I think you just need to change that to 'Y' (and specify the correct center coordinate)