More complex and composite examples: external solver coupling (CFD, FEM), and physics beyond plain mechanical contact (buoyancy, electricity, optics, liquid transport, load balancing).
buoyancy/— particles of different densities settling/rising in a fluid-filled vessel viaenable_buoyancy, optionally combined with one-way drag coupling.electrical_conductivity/— current flow and resistive heating through a compressed particle bed under an applied voltage.finite_element_coupling/— two-way DEM-FEM coupling with the external Elmer solver on a deforming elastic mesh.laser/— a scanning laser modeled as reflecting photon particles that trace a pattern onto a particle bed.liquid_transport_porosity/— a rigid porous particle absorbing injected liquid into internal pore volume (fixed diameter).liquid_transport_sponge/— a sponge-like particle that swells in diameter as it absorbs liquid.liquid_transport_spray/— liquid sprayed onto the free surface of a tumbling particle bed in a rotating drum.loadbalancing/— demonstrates parallel domain decomposition (RCB) re-balancing as a particle bed shifts under a moving mesh.one_way_coupling/— one-way DEM-CFD drag coupling from a static fluid velocity field, across multiple drag laws and particle shapes.powder_compaction/— axial compaction of a fine powder under a force-controlled servo wall, using an elastic/plastic powder contact model (with a cohesive variant).variableProps_cohesionTemp/— SJKR cohesion strength made a function of particle temperature via a lookup table.