Creating the Airgap Regions

For the airgap, you require two regions—one region that rotates with the magnet and the surrounding air region, and a stationary region.

To create the stationary airgap region:
  1. Expand the Geometry > Parts node.
  2. Multi-select the Airgap_Fixed and Airgap_Fixed_Extrusion nodes.
  3. Right-click one of the selected nodes and select Assign Parts to Regions...
  4. In the Assign Parts to Regions dialog:
    1. Select the following options:
      • Create One Region for All Parts
      • Create One Boundary for All Part Surfaces
      • Do Not Create Interfaces from Contacts (in this simulation, you create the required interfaces manually)
    2. Click Apply then Close.
  5. Expand the Regions node and rename Region to Airgap_Fixed.
To create the rotating airgap region:
  1. Multi-select the Parts > Airgap_Rotating and Airgap_Rotating_Extrusion nodes.
  2. Right-click one of the selected nodes and select Assign Parts to Regions...
  3. In the Assign Parts to Regions dialog:
    1. Select the following options:
      • Create One Region for All Parts
      • Create One Boundary for All Part Surfaces
      • Do Not Create Interfaces from Contacts
    2. Click Apply then Close.
  4. Expand the Regions node and rename Region to Airgap_Rotating.
Set the region to rotate with the rotation motion that you defined earlier:
  1. Select the Regions > Airgap_Rotating > Physics Values > Motion Specification and set Motion to Rotation.
The imprint operation between the airgap parts result in new part surfaces. Before you can generate the mesh for the airgap, these new surfaces must be assigned to region boundaries:
  1. Right-click the Geometry > Operations > Imprint node and select Execute.
    Simcenter STAR-CCM+ creates the new part surfaces.
  2. Right-click the Geometry > Parts > Airgap_Fixed > Surfaces > Imprint node and select Set Boundary > Boundary.
  3. Repeat the previous step for the Parts > Airgap_Rotating > Surfaces > Imprint node.
  4. Save the simulation.