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Simulation study of granular compaction dynamics under vertical tapping.

D Arsenović1, S B Vrhovac, Z M Jaksić

  • 1Institute of Physics, P.O. Box 68, Zemun 11080, Belgrade, Serbia.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 7, 2007
PubMed
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Numerical simulations reveal that shaking frictional hard disks compacts them by reducing large pores. Compaction dynamics follow a Mittag-Leffler function, with shaking intensity influencing relaxation time and grain mobility.

Area of Science:

  • Physics
  • Materials Science
  • Computational Science

Background:

  • Granular materials exhibit complex behaviors under external stimuli.
  • Understanding compaction is crucial for various industrial processes.

Purpose of the Study:

  • To investigate the compaction dynamics of frictional hard disks under vertical shaking.
  • To analyze the influence of friction and restitution on compaction.
  • To elucidate the microscopic mechanisms driving compaction.

Main Methods:

  • Numerical simulations using an event-driven molecular-dynamics algorithm.
  • Analysis of density evolution, relaxation time, and grain mobility.
  • Characterization of local disk organization via contact connectivity and pore volume distribution.

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Main Results:

  • Compaction dynamics are described by a Mittag-Leffler function.
  • Relaxation time (tau) decays with tapping intensity (Gamma) as a power law.
  • Compaction is primarily driven by the reduction of the largest pores.
  • Memory effects in response to tapping intensity changes are linked to pore and connectivity evolution.

Conclusions:

  • The study provides a quantitative description of granular compaction under shaking.
  • Microscopic analysis reveals pore size reduction as the key compaction mechanism.
  • The findings offer insights into the memory effects in granular systems.