I use it for erosion simulations in piping systems. I work in kind of a niche field, and there really aren’t any commercial tools that do what I need. With a fair bit of effort, OpenFOAM can be customized to do pretty much anything. It should be able to do a steady flow simulation over a vehicle right out of the box though. The hard part will be generating a mesh. I’d recommend doing that with specialized meshing software.
Came here to say this. If I could get past crippling procrastination, I wouldn’t need any other superpowers.