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Published in:
2005 | OriginalPaper | Chapter
Computer Simulations of Magnetic Grains
Authors : S. Fazekas, J. Kertész, D.E. Wolf
Published in: Traffic and Granular Flow ’03
Publisher: Springer Berlin Heidelberg
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In dense arrangements of magnetic grains, cutting off the interaction potential gives a possibility to accelerate simulation algorithms. We argue that
R
≈ 5 particle diameters is a reasonable choice for dipole-dipole interaction cutoff in two-dimensional dipolar hard sphere systems, if one is interested in local ordering. As an application, we performed computer simulations based on a two-dimensional Distinct Element Method to study granular systems of magnetized spherical particles. The effect of the magnetization on the angle of repose, on the surface roughness of piles, and on particle avalanches were studied. We found a smooth transition in the avalanche formation from a
granular regime
to a
correlated regime
controlled by the magnetic interparticle force. This observation underlines the analogies between systems with magnetic and adhesive forces.