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Bifurcations of a driven granular system under gravity.

M Isobe1

  • 1Department of Physics, Kyushu University 33, Fukuoka 821-81, Japan. isobe@cphys.s.kanazawa-u.ac.jp

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 3, 2001
PubMed
Summary

This study explores granular dynamics using molecular dynamics simulations. Increasing control parameters reveals three distinct phases: condensed, locally fluidized, and granular turbulent, marked by fluidized holes.

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Area of Science:

  • Physics
  • Materials Science
  • Computational Science

Background:

  • Granular materials exhibit complex behaviors under external forces.
  • Understanding phase transitions in granular systems is crucial for various applications.

Purpose of the Study:

  • To investigate granular bifurcation in a simplified model using molecular dynamics.
  • To analyze the competition between gravitational force and heat bath effects on granular systems.

Main Methods:

  • Molecular dynamics simulations of hard disks with inelastic collisions.
  • Application of uniform external gravity and heat bath driving.

Main Results:

  • Identified three distinct phases: condensed, locally fluidized, and granular turbulent.

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  • Phase transitions are characterized by the emergence and destabilization of fluidized holes.

    • Conclusions:

    • The transition to the locally fluidized phase is marked by the appearance of fluidized holes.
    • The transition to the granular turbulent phase involves the destabilization of these holes due to interference.