Mixing and interleaving of layers of particles in a viscoelastic fluid driven by a background force. Particles originating from different quadrants are colored blue, green, red, and yellow.
From the article:
Transition to Mixing and Oscillations in a Stokesian Viscoelastic FlowBecca Thomases and Michael Shelley
Phys. Rev. Lett. 103, 094501 (2009)
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