Close-packed floating clusters: granular hydrodynamics beyond the freezing point?

Details Close-packed floating clusters: granular hydrodynamics beyond the freezing point? Close-packed floating clusters: granular hydrodynamics beyond the freezing point?

2003-05-28

arxiv.org/abs/cond-mat/0305657v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.024301

Monodisperse granular flows often develop regions with hexagonal close packing of particles. We investigate this effect in a system of inelastic hard spheres driven from below by a "thermal" plate. Molecular dynamics simulations show, in a wide range of parameters, a close-packed cluster supported by a low-density region. Surprisingly, the steady-state density profile, including the close-packed cluster part, is well described by a variant of Navier-Stokes granular hydrodynamics (NSGH). We suggest a simple explanation for the success of NSGH beyond the freezing point.

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