Coupling different levels of resolution in DEM simulations
Sprache des Vortragstitels:
9th International Conference on Multiphase Flow (ICMF 2016)
Sprache des Tagungstitel:
Despite constantly growing computing power, discrete element method simulations of particulate systems can hardly reach the time and length scales required to describe industrial applications. Coarse-grained models have been developed to reduce computational costs and to make simulations of large granular systems feasible. However, these models cannot replace fine-grained simulations completely. Important details may be missed and in the worst case incorrect results are produced.
We present a novel technique for efficient multi-scale DEM simulations. The approach is designed for granular systems where full resolution is required only in spatially confined sub-regions whereas a lower level of detail is sufficient for the rest of the system.
Our method establishes two-way coupling between fine- and coarse-grained parts of the system by volumetric passing of boundary conditions. By this we are able to reach large time and length scales while retaining details of critical regions.
The method is tested by comparing the computed statistical properties of the coupled coarse-grained - fine-grained model with the corresponding properties of the fully resolved reference system.