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Cluster growth in driven granular gases.

Martial Noirhomme1, François Ludewig1, Nicolas Vandewalle1

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Summary
This summary is machine-generated.

Granular gas particles form clusters in corners, then merge centrally. An empirical model explains this dynamic structural transition and particle capture.

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Area of Science:

  • Physics
  • Complex Systems

Background:

  • Granular gases exhibit complex behaviors, including clustering.
  • Understanding particle dynamics in confined geometries is crucial.

Purpose of the Study:

  • To investigate the internal structures of driven granular gases in cuboidal cells.
  • To model the observed cluster growth and structural transitions.

Main Methods:

  • Numerical and theoretical investigations.
  • Local packing fraction criterion using Voronoi tessellation for particle classification.
  • Analysis of cluster formation, surface growth, and merging dynamics.

Main Results:

  • Small clusters form in cell corners, exhibiting condensation-like growth.
  • A critical cluster size triggers a structural transition, leading to central merging.
  • A central hole forms and becomes a new particle capture site.

Conclusions:

  • The study elucidates partial clustering phenomena in granular gases.
  • An empirical model is proposed for cluster growth, incorporating structural modifications and saturation packing fraction.