Exact predictions from the Edwards ensemble versus realistic simulations of tapped narrow two-dimensional granular columns
We simulate, via a discrete element method, the tapping of a narrow column of disks under gravity. For frictionless disks, this system has a simple analytical expression for the density of states in the Edwards volume ensemble. We compare the predictions of the ensemble at constant compactivity agai...
Guardado en:
| Autores principales: | , , |
|---|---|
| Formato: | Articulo Preprint |
| Lenguaje: | Inglés |
| Publicado: |
2013
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/97228 https://ri.conicet.gov.ar/11336/23421 http://iopscience.iop.org/article/10.1088/1742-5468/2013/12/P12012/meta |
| Aporte de: |
| Sumario: | We simulate, via a discrete element method, the tapping of a narrow column of disks under gravity. For frictionless disks, this system has a simple analytical expression for the density of states in the Edwards volume ensemble. We compare the predictions of the ensemble at constant compactivity against the results for the steady states obtained in the simulations. We show that the steady states cannot be properly described since the microstates sampled are not in correspondence with the predicted distributions, suggesting that the postulates of flat measure and ergodicity are, either or both, invalid for this simple realization of a static granular system. However, we show that certain qualitative features of the volume fluctuations which are difficult to predict from simple arguments are captured by the theory. |
|---|