Velocity field of a supersonic granular flow incident on a wedge; the colors indicate the horizontal component of the velocity. As the flow encounters the obstacle it forms a shock that is very similar to shocks formed by supersonic gas flows.
From the article:
Shocks in Supersonic SandErin C. Rericha, Chris Bizon, Mark D. Shattuck, and Harry L. Swinney
Phys. Rev. Lett. 88, 014302 (2001)
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