TPerCellBoundaryConditions ( const [TKinematicGeometryParticles](API\Runtime\Chaos\Chaos\TKinematicGeometryParticles)< T, d > & CollisionParticles, const [TKinematicGeometryParticles](API\Runtime\Chaos\Chaos\TKinematicGeometryParticles)< T, d > & SourceParticles )