The flow of granular material in a rotating cylinder was simulated bymolecular dynamics in two dimensions using spherical as well as nonsphericalgrains. At very low but constant angular velocity we found that the flow variesirregularly with time. The particles move stick-slip like i.e. there areavalanches of different size at the surface of the granular material. Observingthe traces of the particles we found that there are unstable convection cells.Our results agree with recent experiments by Rajchenbach [1] and Rolf [2].
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