Tangentially related: For a long time I've always been looking for some software for particle simulations that is free or even open source, easy to get started, and at least somewhat visual. I'm not doing anything like that professionally, just want to play around with a virtual wind tunnel for the fun of it. I'm thinking of something like Blender where I would click together a 3d mesh, "turn on" wind and see what happens.<p>Does anyone have tips or hints? Are my expectations perhaps unrealistic? I looked into OpenFOAM before but always eventually gave up, as it seems quite heavy on headless, scripted simulation, and would need some significant run-up time.