Hi @Miroslav123,
Sorry for the delay, I just saw many issues to fix in the geometry such as missing faces, small edges, intersections, etc. I have fixed that and I did a generic CFD setup just to give you the idea that now the CAD file is working well.
Please feel free to make a copy and then do your own improvements in the project 
I also would like to recommend you to do your setup according to this step-by-step tutorial down below, for sure it might be very helpful in your simulation case.
best,