Passive Scalar Transfer Model Reference

The Passive Scalar Transfer model transfers conserved quantities of passive scalar from one particle to another when the particles are in contact.

In this model, when particles make contact, a quantity of passive scalar transfers from one particle to the other. For example, using this model, you can simulate a thin coating of negligible mass transferring from one particle to another as they scrape against each other.

Theory See Passive Scalar Transfer for DEM Particles.
Provided By [physics continuum] > Models > Multiphase Interaction > Phase Interactions > Phase Interaction [n] > Models > Optional Models
Example Node Path Continua > Physics 1 > Models > Multiphase Interaction > Phase Interactions > Phase Interaction 1 > Models > > Passive Scalar Transfer
Requires

Under Lagrangian Multiphase, select:

  • Particle Type: DEM Particles
  • Particle Shape: any shape

Under Multiphase Interaction, select:

  • Phase Interaction Topology: DEM Phase Interaction if it has not been automatically selected.
  • Set the First Phase and Second Phase properties of DEM Phase Interaction.
Activates Model Controls (child nodes) Contact Passive Scalar Transfers

Contact Passive Scalar Transfers Node

This node holds nodes for each passive scalar interaction you want to model. These interactions can include contact between phases, contact of a phase with itself, and contact of a phase with a wall.

Before you can create interaction nodes, you must have at least one node for a passive scalar under the Passive Scalars model node, under Lagrangian Multiphase.

To create an interaction node:

  1. Right-click the Contact Passive Scalar Transfers node and select New. A menu of interactions displays.
  2. From the menu, select Area Weighted, Increment, Source, or Volume Weighted. A Coefficient node for the new interaction appears under the Contact Passive Scalar Transfers node.
  3. Set the properties for the new interaction node.

You can create an arbitrary number of interaction nodes.

Interaction Node Properties

Phase 1 Material and Phase 2 Material
Phase 1 Material is the passive scalar selected for the phase listed as First Phase under DEM Phase Interaction, and Phase 2 Material for the Second Phase. The abstract scalar "materials" are transferred between the first and second phases. Note that Phase 1 Material and Phase 2 Material can refer to the same material; that is, the two properties can have the same value.
Number
Read only. An index number for the interaction node.
Coefficient
For Area Weighted and Volume Weighted transfers, this is the coefficient k in Eqn. (3318), acting as the equivalent of a diffusion constant. The higher the value, the faster the transfer rate. The value is given in a standard profile.

For Increment transfer, k is the amount of passive scalar transferred on each contact.

For Source, the value is integrated over time for the duration of the contact. The value is given in a standard profile and corresponds to k in Eqn. (3325).

Flow Cutoff
Area Weighted and Volume Weighted transfers no longer take place when the transfer rate falls below this value. The default value is 1.0E-8. Increment transfers do not have this property.