Physics simulators like this is something I find really fun to play with, but there’s one thing I’ve been searching for but can’t find any: fluid and erosion simulation.<p>I’ve been playing Cities: Skylines since it came out and I love the fluid simulation in the rivers and mountains and dams, but I would love to see the course of the river change over the years. I’d love to see the rivers carving paths out of the mountains, and have floods/tsunamis change the shape of the coast.<p>I doubt they’re going to add that to Cities: Skylines any time soon, but does anyone know of any toy/game like that? Interactive fluid and erosion simulators?