Physical test of a particle simulation model in a sheared granular system
Chris H Rycroft1, Ashish V Orpe, Arshad Kudrolli
1Department of Mathematics, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. chr@math.berkeley.edu
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2009
Summary
This study compares experimental granular flow in a silo with discrete-element simulations. Results show strong quantitative agreement, validating simulation models for granular materials.
Area of Science:
- Physics
- Engineering
Background:
- Granular flows are ubiquitous in nature and industry.
- Accurate simulation of granular materials is crucial for process design.
Purpose of the Study:
- To quantitatively compare experimental gravity-driven granular flow with discrete-element simulations.
- To validate discrete-element models for granular flow dynamics.
Main Methods:
- Experiments used a rectangular silo with varying boundary roughness.
- Particle tracking velocimetry with index-matching was employed.
- Discrete-element simulations utilized the Cundall-Strack contact model.
Main Results:
- Detailed comparison of mean flow properties and particle fluctuation properties.
- Investigated effects of friction, elasticity, contact models, and polydispersity.
- High level of quantitative agreement observed between experiments and simulations.
Conclusions:
- Discrete-element simulations accurately capture key aspects of slow granular flow.
- The study validates the use of specific simulation parameters and models.
- Findings support the predictive power of DEM for granular material behavior.
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