Need help making clean models for CFD testing

[subversivespeed]

Fusion 360 needs a "stitch/smoothng/edge extension" routine that will prepare a model to go cleanly into Autodesk CFD. 

I am chasing my tail looking for the very smallest of errors and Autodesk refuses to take my geometry. Its absolutely nervewracking. 

I can go over a long list of everything I tried from nearly every forum I could find, and it just seems to me either F360 is too loose with its definitions of "mating" or Autodesk CFD is simply too tight. Either way, need a way to get this model into CFD and its killing me right now. 

Things I have tried:

Exporting as STL, SAT, etc etc. and importing into CFD

Exporting as STL, smoothing, then importing into CFD

Overlapping components so they intersect.. But, then I found that CFD complains about that also..

Any insight as to what can be done here? I will post the model. It has some proprietary info but don't really care since I already have a prelim patent on it so meh.. 

Any help is appreciated... 

[TrippyLighting]

In what format can you import into the CFD software ?

You mentioned .stl, but I’d imagine it also takes STEP and that might be the better option.

[TrippyLighting]

Here is a list of CAD formats supported by Autodesk CFD. It includes STEP as a format.

[subversivespeed]

I tried every type possible and it simply kicks it back. 

[TrippyLighting]

I am assuming there is an error message ?

[subversivespeed]

Ok, update:

STP file went in fine, had to edit base model in Fusion 360. 

Now I need to figure out how to use fluid volume to, well, make my fluid volume. I am somewhat surprised I cannot simply define the entry and exit boundary edges and have it fill using the defined model surface without having to pick each individual surface.. That alone is going to be extremely difficult and tedious. There has got to be a better way...