Granular column collapse: Analysis of grain-size effects.
Miguel Cabrera1, Nicolas Estrada1
1Department of Civil and Environmental Engineering, Universidad de los Andes, Bogotá, Colombia.
Physical Review. E
|February 21, 2019
Summary
Grain-size effects can impact granular column collapse simulations. To ensure accurate results, maintain a high system-size to grain-size ratio, especially for tall columns, to avoid misleading findings.
Area of Science:
- Physics
- Geophysics
- Engineering
Background:
- Column collapse experiments simplify complex granular flows.
- Previous studies have explored granular column collapse experimentally and numerically.
Purpose of the Study:
- To investigate the influence of grain-size effects on granular column collapse simulations.
- To determine the necessary system-size to grain-size ratio for accurate simulation results.
Main Methods:
- Simulations of two-dimensional granular columns using the discrete-element method (contact dynamics).
- Analysis of the impact of varying grain size relative to system size.
Main Results:
- Previously published results may be influenced by grain-size effects.
- A system-size to grain-size ratio >75 for short columns and >50 for tall columns is recommended to avoid these effects.
- Column mobility and collapse duration are significantly affected by grain-size effects.
Conclusions:
- Guidelines are provided for researchers to avoid grain-size effects in simulations.
- Ensuring an adequate system-size to grain-size ratio is crucial for reliable granular flow research.
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