Experiments and simulations of a gravitational granular flow instability.

@article{Vinningland2007ExperimentsAS,
  title={Experiments and simulations of a gravitational granular flow instability.},
  author={Jan Ludvig Vinningland and Oistein Johnsen and Eirik Grude Flekk\oy and Renaud Toussaint and Knut J\orgen M{\aa}l\oy},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2007},
  volume={76 5 Pt 1},
  pages={051306}
}
An instability is observed as a layer of dense granular material positioned above a layer of air falls in a gravitational field [Phys. Rev. Lett. 99, 048001 (2007)]. A characteristic pattern of fingers emerges along the interface defined by the grains, and a transient coarsening of the structure is caused by a coalescence of neighboring fingers. The coarsening is limited by the production of new fingers as the separation of the existing fingers reaches a certain distance. The experiments and… CONTINUE READING

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