DEM Phase Interaction Model Reference

The DEM Phase Interaction model provides access to other models that define particle interaction behavior.


Theory	See Discrete Element Method in Theory.
Provided By	[physics continuum] > Models > Multiphase Interaction > Phase Interactions > Phase Interaction n > Models > Phase Interaction Topology
Example Node Path	Continua > Physics 1 > Models > Multiphase Interaction > Phase Interactions > Phase Interaction n > Models > DEM Phase Interaction
Requires	Optional Models: Discrete Element Model (DEM) Multi-Phase Interaction: Multiphase Interaction Under Multiphase Interaction > Phase Interactions > Phase Interaction n: Phase Interaction Topology: DEM Phase Interaction
Properties	Key properties are: First Phase, Second Phase, Passive Scalars. See DEM Phase Interaction Model Properties.
Activates	Physics Models	DEM Contact Models
	Field Functions	Contact Centroid, Contact Damping Force, Contact Elastic Force, Contact Normal, Contact Normal Overlap, Contact Overlap, Contact Relative Velocity, Contact Tangential Overlap. See DEM Phase Interaction Model Field Functions.

DEM Phase Interaction Model Properties

First Phase: Specifies the first interacting DEM phase. Only DEM phases that are defined under the Lagrangian Multiphase model are available. The initial value is set when the Phase Interaction n node is created.
Second Phase: Specifies the second interacting DEM phase. Only DEM phases that are defined under the Lagrangian Multiphase model are available. The initial value is set when the Phase Interaction n node is created.
Passive Scalars: When On, activates the Contact [passive scalar n] field functions, one for each passive scalar defined under the Lagrangian Multiphase and Multiphase Interaction models.

DEM Phase Interaction Model Field Functions

Contact Area: The maximum cross-sectional area of the overlap volume of a pair of colliding particles, taken perpendicular to the line joining particle centers.
Contact Centroid: The coordinates of the contact point between colliding particles.
Contact Damping Force: The non-elastic component of the contact force between two particles, that is, the contact force minus the elastic component. To access this field function, select the DEM Particles, DEM Phase Interaction, and either the Hertz Mindlin or Walton Braun models.
Contact Elastic Force: The elastic component of the contact force between two particles, that is, the contact force minus the damping component. To access this field function, select the DEM Particles, DEM Phase Interaction, and either the Hertz Mindlin or Walton Braun models.
Contact Normal: A unit length vector perpendicular (orthogonal) to the contact plane. To access this field function, select the DEM Particles, DEM Phase Interaction, and either the Hertz Mindlin or Walton Braun models.
Contact Normal Overlap: The contact normal vector that is multiplied by the overlap, giving the direction and magnitude of the particle overlap, normal to the contact plane. To access this field function, select the DEM Particles, DEM Phase Interaction, and either the Hertz Mindlin or Walton Braun models.
Contact Overlap: The amount of overlap between two particles or a particle and wall boundary upon contact. This overlap occurs as the particles are modeled using soft-particle formulation, which permits a small overlap. To access this field function, select the DEM Particles, DEM Phase Interaction, and either the Hertz Mindlin or Walton Braun models.
Contact [passive scalar n]: The value of passive scalar n.
Contact Relative Velocity: The relative velocity between two contacting particles. To access this field function, select the DEM Particles, DEM Phase Interaction, and either the Hertz Mindlin or Walton Braun models.
Contact Tangential Overlap: The magnitude and direction of the particle overlap, tangential to the contact. To access this field function, select the DEM Particles, DEM Phase Interaction, and either the Hertz Mindlin or Walton Braun models.