Close-packed floating clusters: granular hydrodynamics beyond the freezing point?
arXiv:cond-mat/0305657 · doi:10.1103/PhysRevLett.91.024301
Abstract
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.
4 pages, 5 figures. To appear in Phys. Rev. Lett
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