Effect of the Rolling Friction on the Heap Formation of Dry and Wet Coarse Discs

We performed 2D numerical simulations to study the dynamic heap formation of coarse particles in different dry and wet conditions. Our results show that dynamics depend not only on amount liquid contained bulk, but also initial packing, i.e., arrangement grains. The cohesion model effect discs is minimal. This mostly noticed particle energy variation rather than formation. found system varies with content up a threshold value, equal 219% our study, where influences parameters are At high volume, final pile height radius tend towards an asymptotic value. has significant impact behavior bulk after opening lateral walls. number triangle, formed by width packing as base depth N × D, representing vertical line D their diameter, shape pile. Indeed, larger number, smaller same capillary forces reduce kinetic increase potential when used elastic-plastic spring dashpot model. For directional constant model, dependance torque normal force size explains there almost no difference between regarding energies. Finally, spring-dashpot more efficient reducing producing stable piles. simulation using glass beads good agreement experiments.