FRLP - I+D+i - GRUTN - GMG - PUBLICACIONES EN REUNIONES CIENTÍFICAS Y TÉCNICAS
Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/1766
Browse
Item Effect of grain shape on the jamming of two dimensional silos(EPJ Web of Conferences, 2017) Goldberg, Ezequiel; Carlevaro, Manuel; Pugnaloni, LuisWe present discrete element method simulations of the discharge of silos in two dimensions. We study the effect of the grain shape on the clogging of small apertures, considering regular polygons and disks of equal mass. In particular, we analyze the avalanche size distribution and the jamming probability for disks, triangles, squares, pentagons, hexagons and heptagons as a function of the aperture size. We show that the jamming probability presents a non-linear response as a function of the number of vertexes of the polygons.Item Exact predictions from Edwards ensemble vs realistic simulations of tapped narrow two dimensional granular columns(Journal of Statistical Mechanics: Theory and Experiment, 2013) Irastorza, Ramiro; Carlevaro, Manuel; Pugnaloni, LuisWe 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.