PFC3D

PFC3D (Particle Flow Code in 3 Dimensions) is a discontinuum code used in analysis, testing, and research in any field where the interaction of many discrete objects exhibiting large-strain and/or fracturing is required.
Because PFC3D is not designed to examine a particular type of problem, its range extends to any analysis that examines the dynamic behavior of a particulate system.
In PFC3D, materials may be modeled as either bonded (cemented) or unbonded (granular) assemblies of particles.

Though the code uses spherical particles by default, particle shape may be defined in a PFC3D model through use of the built-in clump logic.