Research Grant Report
Discrete Element Method for Bulk Powder Flows
2021 Volume 29 Pages 73-77
Details
2021 Volume 29 Pages 73-77
In Discrete Element Method (DEM), it is common to reduce the particle stiffness artificially from the original material property to employ a large time step and reduce the computational cost. When simulating cohesive particles, however, the reduction of the particle stiffness can cause excessive energy dissipation due to the prolonged contact duration, which can make the particles become more cohesive than the original ones. Recently, several scaling laws for attraction force are proposed to overcome this problem. Although these scaling laws are effective for dynamic systems where particles are fully fluidized as a bulk body, they are not applicable to relatively static systems since the instantaneous force balance is not maintained. In the present work, a new approach to reduce the viscous damping coefficient instead of the attraction force is proposed. The proposed model is applied to simulate cohesive particles in a rotary drum, and it is confirmed that the static phenomena such as the particles sticking on the drum wall as well as the dynamic phenomena such as the dynamic angle of repose are well replicated at the same time, which is difficult to achieve with the conventional method.
