Bulk flow and moving mesh
 

I am trying to model the effect of bulk flow on fan performance, i have a 3d mesh of the fan blades rotating as a moving mesh within a stationary domain with a pressure far field boundary. When I try to impose a bulk flow to the pressure far field the coordinate system which it appears to be using is the local coordinate system of the moving mesh not the global stationary coordinate system. Does anyone have any idea what i may have done wrong in stting up this problem or how to remedy it? thanks phil