Setting Up a Criteria Function

You select the particular criteria function that you require as a phase interaction model.

To set up a Criteria Function:

  1. Select the Casting model.
  2. Select Multiphase Interaction from the Optional Models group box.
  3. In the simulation tree, under the Models > Eulerian Multiphase node, create the Eulerian phase.
  4. Under the Eulerian phase, open the Phase Model Selection dialog and select the following models:
    1. Select Liquid from the Material group box.
    2. Select Melting-Solidification from the Optional Models group box.
    3. Select Solidification Time from the Optional Models group box.
      You must select the Solidification Time model first for the Criteria Functions model to become available.
    4. Optionally, select Liquid Residence Time from the Optional Models group box.
    5. Select Criteria Functions from the Optional Models group box.


  5. In the Phase Model Selection dialog, within Optional Models, select the particular criteria function that you require:
    1. Select Primary Dendrite Arm Spacing.
    2. Select Secondary Dendrite Arm Spacing and then select one of the following sub-models:
      • Secondary Dendrite Arm Spacing (CR)
      • Secondary Dendrite Arm Spacing (LST)
    3. Select Dimensionless Niyama Criterion.
    NoteYou are advised to select the Secondary Dendrite Arm Spacing (CR) model in combination with the Dimensionless Niyama criterion, because only this model complies with the original formulation of the Dimensionless Niyama model [134].
  6. Click Close.

    The Criteria Functions node, the Liquid Residence Time node, and the Solidification node are added to the Eulerian phase models in the simulation tree. The Initial Conditions node is added to the Eulerian phase.



  7. Select each child node of the Initial Conditions node in turn and set the initial conditions for:
    • Liquid Residence Time
    • Solidification Time