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Inertial Force Transmission in Dense Granular Flows.

Matthew Macaulay1, Pierre Rognon1

  • 1School of Civil Engineering, The University of Sydney, Sydney, NSW 2006, Australia.

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Summary
This summary is machine-generated.

Faster granular flows with stiffer grains exhibit high contact forces. This study reveals a rate-dependent force transmission mechanism, linking contact forces and grain velocities to unify continuum models.

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Area of Science:

  • Physics of granular materials
  • Continuum mechanics
  • Computational physics

Background:

  • Continuum models effectively describe dense granular flows, but internal dynamics, particularly contact forces, are not fully understood.
  • Understanding granular flow dynamics is crucial for various applications, including geophysics and industrial processes.

Purpose of the Study:

  • To investigate the distribution of contact forces within simulated steady and homogenous shear flows of dense granular materials.
  • To elucidate the relationship between flow rate, grain stiffness, and contact force magnitudes.
  • To propose a physical mechanism explaining rate-dependent force transmission in granular flows.

Main Methods:

  • Simulations of steady and homogenous shear flows of dense granular materials.
  • Analysis of contact force distributions within the simulated flows.
  • Development of a physical model to explain observed force transmission phenomena.

Main Results:

  • High magnitude contact forces were observed in faster granular flows and flows with stiffer grains.
  • A novel physical mechanism was proposed to explain the observed rate-dependent force transmission.
  • A direct relationship was established between contact forces and grain velocities in the simulated flows.

Conclusions:

  • The study provides critical insights into the internal dynamics of dense granular flows, specifically concerning contact force behavior.
  • The findings offer a pathway to unify disparate continuum models by linking contact force and grain velocity descriptions.
  • This research contributes to a more comprehensive understanding of granular material behavior under shear.