Simulation Study of Granular Compaction Dynamics under Vertical Tapping
We study by numerical simulation the compaction dynamics of frictional hard disks in two dimensions, subjected to vertical shaking. Shaking is modeled by a series of vertical expansions of the disk packing, followed by dynamical recompression of the assembly under the action of gravity. The second p...
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Veröffentlicht in: | Materials science forum 2007-09, Vol.555, p.107-112 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We study by numerical simulation the compaction dynamics of frictional hard disks in
two dimensions, subjected to vertical shaking. Shaking is modeled by a series of vertical expansions
of the disk packing, followed by dynamical recompression of the assembly under the action of
gravity. The second phase of the shake cycle is based on an efficient event−driven
molecular−dynamics algorithm. We analyze the compaction dynamics for various values of friction
coefficient and coefficient of normal restitution. We find that the time evolution of the density is
described by ρ(t)=ρ∞ − ρEα[−(t/τ)α], where Eα denotes the Mittag−Leffler function of order
0 |
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ISSN: | 0255-5476 1662-9752 1662-9752 |
DOI: | 10.4028/www.scientific.net/MSF.555.107 |