# PhasicFlow: src/Interaction/grainInteraction/boundaries -> phasicFlow Relation
PhasicFlow is an open-source parallel DEM (discrete element method) package for simulating granular flow. It is developed in C++ and can be exectued on both GPU (like CUDA) and CPU.

### boundaries → phasicFlow Relation

File in src/Interaction/grainInteraction/boundaries | Includes file in src/phasicFlow
--- | ---
boundaryGrainInteractionList.hpp | structuredData / boundaries / boundaryList.hpp
boundaryGrainInteractionList.hpp | containers / List / ListPtr / ListPtr.hpp
boundaryGrainInteraction / boundaryGrainInteraction.hpp | typeSelection / virtualConstructor.hpp
boundaryGrainInteraction / boundaryGrainInteraction.hpp | containers / pointField / boundaryField / generalBoundary / generalBoundary.hpp