Influence of various DEM shape representation methods on packing and shearing of granular assemblies

Abstract Realistic yet efficient representation of particle shape is a major challenge for the Discrete Element Method. This paper uses angle-of-repose and direct-shear test simulations to describe influence several methods, their parameters, on bulk response granular assemblies. Three rolling resistance models, with varying coefficient friction, are considered spherical particles. For non-spherical particles, superquadrics blockiness multi-spheres bumpiness used model cuboids cylinders aspect ratios. We present extensive quantitative results showing how various ways represent affect response, allowing comparisons between different approaches. Simulations tests show that all three friction models can avalanching characteristics cube/cuboid cylindrical suggest both shear strength dilative particles (but not porosity) only be predicted by elasto-plastic model. The nature allows identifying values shape-description parameters obtain similar when using alternative methods. Graphical abstract