I finally got around to making my previous stadium wave simulation run in 2D. It makes pretty patterns as I expected it would. The fascinating thing about it is that there's these interior waves that back propagates as the outer wave spreads out. There's some sort of instability that causes little imperfections (probably due to the imposed spatial lattice) that gets these little eddies started and once their started they tend to collide and make interesting things happen. The simulation is torodial so once the wave hits the edges it interacts with itself and then all kinds of beautiful things happen. (Note, the image looks wider than it really is -- what looks like an oval is actually a circle.)
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