Defining a Direct Reference Frame

Simcenter STAR-CCM+ supports adding a rotating reference frame directly to a region in both steady state or transient simulations. A direct rotating and translating reference frame is not supported.

Additionally, if there are more parts assigned to the region, you can subgroup the parts and define a rotation for each subgroup.
  1. To add a direct moving reference frame to a region, select the Regions > [region] > Physics Conditions > Motion Specification Option and set the Option to Direct Rotating Reference Frame Values.
    The corresponding nodes appear under Physics Values:


  2. Select the Physics Values > Direct Rotating Reference Frame > Direct Rotating Reference Frame Values node and set the properties to specify the rotation.
  3. To activate the Part Subgroup of the reference frame:
    1. Select the Regions > [Region] node and activate Allow Per-Part Values.
      A node Part Subgroupings appears in the simulation tree with a predefined Subgrouping 1—A collection of subgroups and a predefined Subgroup 1. See also: Applying Quantities by Subgroup.


    2. To add additional subgroups, right-click the Part Subgroupings > Subgrouping 1 node and select New.
    3. Select the Subgrouping 1 > [subgroup] node and group the parts with the same rotation values in Objects.
    4. To specify a rotation for each subgroup, select the Physics Values > Direct Rotating Reference Frame node and activate Specify by Part Subgroup.
      The existing subgroups are added automatically to the Direct Rotating Reference Frame > By Parts Subgroup node.
    5. Select the Direct Rotating Reference Frame > By Parts Subgroup > [subgroup] > Direct Rotating Reference Frame Values and set the properties to specify the rotation of this subgroup.
  4. (Optional) To modify the reference frame of the boundary, refer to Boundary Reference Frame Reference.