  The evolution of a pile of granular material is investigated by molecular
dynamics using a new model including nonsphericity of the particles instead of
introducing static friction terms. The angle of repose of the piles as well as
the avalanche statistics gathered by the simulation agree with experimental
results. The angle of repose of the pile is determined by the shape of the
grains. Our results are compared with simulations using spherical grains and
static friction.
