DEVELOPMENT OF IMPULSE-BASED DEM WITH VARIABLE TEMPORAL RESOLUTION

Abstract

The distinct element method (DEM) is used for analyzing interaction of colliding particles in various fields. The conventional DEM has an upper limit of time step mainly because of linear oscillatory dynamics if it has high spring stiffness. Therefore it requires greater computational resources. In addition, it has difficulties in deciding the parameters of particles simulating collision of hard materials. In this study we propose an impulse-based DEM with variable temporal resolution for analyzing industrial machines with dynamic hard spheres. This model has less parameters of particles and larger upper limit of the time step than the conventional model. We verify qualitative accuracy of our proposed model by observing behavior of particles in the ball mill, and compare results obtained by the proposed model with experimental and results of conventional model.