Effects of particle angularity on granular self-organization

Recent studies of two-dimensional polydisperse disk systems have revealed a coordinated self-organization of cell stresses and shapes, with certain distributions collapsing onto a master form for many processes, size distributions, friction coefficients, and cell orders. Here we examine the effects of particle angularity on the indicators of self-organization, using simulations of bidisperse regular N polygons and varying N systematically. We find that the strong correlation between local cell stresses and orientations, as well as the collapses of the conditional distributions of scaled cell stress ratios to a master Weibull form for all cell orders k, is independent of angularity and friction coefficient. In contrast, increasing angularity makes the collapses of the conditional distributions sensitive to changes in the friction coefficient.