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Flow-mediated coupling on projectiles falling within a superlight granular medium.

J M Solano-Altamirano1, G A Caballero-Robledo, F Pacheco-Vázquez

  • 1CINVESTAV-Monterrey, PIIT, Nuevo León 66600, México.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Summary
This summary is machine-generated.

Heavy intruder disks falling in granular beds exhibit collective motion. Repulsive forces arise from grain jamming, while attractive forces may stem from a Bernoulli-like effect at high velocities.

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Area of Science:

  • Physics
  • Granular Mechanics
  • Complex Systems

Background:

  • Collective motion observed in granular systems with intruders.
  • Interactions between heavy intruders in light granular beds are not fully understood.

Purpose of the Study:

  • Investigate the origin and range of attractive and repulsive forces between intruder disks.
  • Characterize the flow-mediated interactions in quasi-two-dimensional granular systems.

Main Methods:

  • Experimental investigation of intruder disk dynamics.
  • Discrete-element soft-particle simulations.

Main Results:

  • Drag forces fluctuate, linked to dynamic force chains.
  • Repulsion occurs when disk separation is < 6 times grain size.
  • Attraction has a range of 5-6 times intruder disk size and requires velocities > 1 m/s.

Conclusions:

  • Repulsion likely due to grain jamming between intruders.
  • Attraction may be a granular pressure drop, similar to Bernoulli's principle.
  • Fluctuation-induced forces are a possible alternative explanation for attraction.