This .gif shows the output of a model of the initiation of termination of a <a href="https://en.wikipedia.org/wiki/Rayleigh%E2%80%93Taylor_instability" class="extiw" title="en:Rayleigh–Taylor instability">Rayleigh–Taylor instability</a> in 2D. This problem considers two immiscible fluids, implemented through the Shan–Chen model. The red fluid is initially located in a layer on top of the blue fluid, and feels the action of gravity. As a way of modeling a large density difference between the fluids, the blue fluid is assumed to be unaware of gravity. After some time, a Rayleigh–Taylor instability occurs, and the red fluid penetrates the blue one.
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