Regensburg 2007 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Poster II
DY 30.54: Poster
Thursday, March 29, 2007, 16:00–18:00, Poster D
Bottom-to-Top-Restructuring for the simulation of nano-powders — •Thomas Schwager1, Thorsten Pöschel1, and Dietrich E. Wolf2 — 1Charite, Augustenburger Platz 1, 13353 Berlin — 2Fachbereich Physik, Universität Duisburg-Essen, D-47048 Duisburg
When repeatedly redepositing chunks cut out of a two-dimensional packing of adhesive rigid particles one converges to a losely packed assembly whose fractal dimension is close to one. On a system of a few million particles we studied the structural properties of these packings. We found that the system adopts a universal structure which is determined by the chunk size. Moreover, the short-range structure of these assemblies is independent even of the chunk size. To obtain statistically significant results one has to consider systems of particle numbers far higher than one million particles. Granular systems of such sizes are beyond the capabilities of methods like force-based or event-driven Molecular Dynamics. Instead we applied a generalization of the Bottom-to-Top-Restructuring (Visscher and Bolsterli, Nature 239:504, 1972) which allows the simulation of hundred million particles. The results from this study can be applied to packings of nano-powders.