Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2002-07-30
Physics
Condensed Matter
Soft Condensed Matter
36 pages, 17 figures to be published in Phys.Rev E. September 2002
Scientific paper
10.1103/PhysRevE.66.031303
We study the structural properties of two-dimensional granular packings prepared by random deposition from a source line. We consider a class of random ballistic deposition models based on single-particle relaxation rules controlled by a critical angle, and we show that these local rules can be formulated as rolling friction in the framework of dynamic methods for the simulation of granular materials. We find that a packing prepared by random deposition models is generically unstable, and undergoes dynamic rearrangements. As a result, the dynamic method leads systematically to a higher solid fraction than the geometrical model for the same critical angle. We characterize the structure of the packings generated by both methods in terms of solid fraction, contact connectivity and anisotropy. Our analysis provides evidence for four packing regimes as a function of solid fraction, the mechanisms of packing growth being different in each regime.
Bratberg I.
Hansen Angela
Radjaï Farhang
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