Once you have those faces set up correctly in your CAD (those faces would become a CAD defined ‘sort of’ Background Mesh Box (BMB), that would be run as an internal mesh in SimScale), you still need to get that air flowing in a curved path.
I believe that may be accomplished by putting an MRF rotation zone cylinder in your CAD file with an axis that runs vertically up from your screen and with a radius that encloses all the faces of your CAD BMB. Then, in SimScale assign the properties of that MRF under ‘Advanced Concepts’.
I have never set a simulation up like that but that is how I envision that it may be done.