# PhasicFlow: src/Interaction/sphereInteraction/boundaries -> boundarySphereInteraction 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 → boundarySphereInteraction Relation

File in src/Interaction/sphereInteraction/boundaries | Includes file in src/Interaction/sphereInteraction/boundaries/boundarySphereInteraction
--- | ---
boundarySphereInteractionList.hpp | boundarySphereInteraction.hpp
createBoundarySphereInteraction.hpp | boundarySphereInteraction.hpp
periodicBoundarySphereInteraction / periodicBoundarySphereInteraction.hpp | boundarySphereInteraction.hpp