Shocks in supersonic sand

Details Shocks in supersonic sand Shocks in supersonic sand

2001-04-24

arxiv.org/abs/cond-mat/0104474v4

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.88.014302

We measure time-averaged velocity, density, and temperature fields for steady granular flow past a wedge and calculate a speed of granular pressure disturbances (sound speed) equal to 10% of the flow speed. The flow is supersonic, forming shocks nearly identical to those in a supersonic gas. Molecular dynamics simulations of Newton's laws and Monte Carlo simulations of the Boltzmann equation yield fields in quantitative agreement with experiment. A numerical solution of Navier-Stokes-like equations agrees with a molecular dynamics simulation for experimental conditions excluding wall friction.

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