What is the project? Simflow is what you would want for what you're describing. You can import STL and other 3d files directly into the workspace. You can do all of what you're describing in terms of finding pressure and interference issues. I haven't tried to export the pressures, but I would be shocked if you couldn't. Transient analysis is also possible which will give you the values over time. The big concern would be that the free version has a 200,000 node limit on mesh size and the built in mesher uses hex cells which aren't great for rotational flows. I have had trouble getting the coarse mesh to converge for highly rotational and turbulent flows like you would see with vortex shedding. You might look into hand calculations to check if turbulence will cause resonance. The frequency primarily depends on flow velocity and the width of the object so you should be able to calculate if it's at a risky frequency at the least.I've had a project on-again/off-again for decades mainly because of career. Now retired, I need a large workshop which I hope to finish this spring. Which has given me the itch again. I was just using JavaFoil, but the author clearly says the 2D, closed-form methods he uses drastically fail once in stall/turbulent conditions. These two tools you mention... do they have their own CAD or do they import from something like DFX? Although lift/drag are important, I'm looking for after stall conditions and interference problems. I'd also like to be able to export the pressures being applied to the model, so I can suck them back into my FEM to do the structural analysis. Do these analysis programs give pressure data as a function of time? For instance vortex shedding. I think the dynamic fluctuations that might excite natural frequencies in the structure would be far more critical than the ultimate static loads that JavaFoil gives me. aka...
Tacoma Narrows Bridge collapses - History Channel
Kármán vortex street - Wikipedia
XFLR5 stops converging in stall conditions and is much more airplane wing oriented.