Hi Nagi,
Thanks for the files and feel free to just reply to the case emails (I'll send this from there also).
I cannot see any changes were made, so I suggest that the red inlets are extended out to be cuboids - so they will look more like spokes.
Should there be a leakage path as I indicated before? I suggest you close it up - why not just reduce the yellow part (starwheel) to have a diameter of 10in with an additional extrusion?

Then cap off the inlets:

This launches and void fills without issue.
Seems to mesh and run well, although we ought to refine the mesh to ensure 4-5 elements accross any gaps.
(I haven't worried out this to test and obviously, I have guessed the inlet/outlet/flow rate).
I suppressed any parts that were not connected to the main flow volume, there were a few on the 'inlet' side of the model.
Here are some early and rough results

Best regards,
Jon