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We present a molecular dynamics study of the jamming/unjamming transition intwo-dimensional granular piles with open boundaries. The grains are modeled byviscoelastic forces, Coulomb friction and resistance to rolling. Two models forthe rolling resistance interaction were assessed: one considers a constantrolling friction coefficient, and the other one a strain dependent coefficient.The piles are grown on a finite size substrate and subsequently dischargedthrough an orifice opened at the center of the substrate. Varying the orificewidth and taking the final height of the pile after the discharge as the orderparameter, one can devise a transition from a jammed regime (when the grainflux is always clogged by an arch) to a catastrophic regime, in which the pileis completely destroyed by an avalanche as large as the system size. A finitesize analysis shows that there is a finite orifice width associated with thethreshold for the unjamming transition, no matter the model used for themicroscopic interactions. As expected, the value of this threshold widthincreases when rolling resistance is considered, and it depends on the modelused for the rolling friction.

Jamming transition in a two-dimensional open granular pile with rolling resistance