CUDA Fluid dynamics: Kelvin-Helmholtz Instability

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A light fluid (white) and a dense fluid (black) are mixed in a container. Due to buoyancy, the fluids start moving in opposite directions, with the light fluid collecting at the top and the dense fluid at the bottom. Eventually, the interface grows unstable and degrades into turbulent flow.
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This looks great! What's the Reynolds number or Courant number for the flow, and what resolution was it run at?

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