Diffuser inlet boundary condition problem
 

Hi all,
I've got a radial compressor wheel, and after that a diffuser. I want to simulate only the diffuser. I've calculated the inlet velocity components numerically. It has a radial component and an axial component, but the axial is normal to every point on the inlet. If I choose "cartesian velocity component", i set the components in the global coordinate system. In "Cylindrycal vel. comp" the problem is the same. If I choose the "Normal speed" option, i can set the "axial" component, but the radial(which coming from the rotation of the compressor wheel) not. So I have to set an "axial" component, which is normal to inlet in every points, and a radial component, which is perpendicular to these axial components.

Thanks
Attesz