Adding CFD Connections to the Model Map

In GT-SUITE, you define the characteristics of the 1D/3D interfaces using CFD Connection objects. CFD Connections specify the exchanged data, the Simcenter STAR-CCM+ volume-averaging zone length, and how to determine the cross-section of the coupled Simcenter STAR-CCM+ boundary.

To add the required CFDFlowConn connections to the model map:
  1. In the project tree, right-click the Connections > CFDFlowConn node and select Add Object.
  2. In the Template: CFDFlowConn dialog:
    1. Set Object Family to CFDConnection.
    2. Click the Main tab and set the following properties:
      Property/Attribute Setting
      Connection Type Gas (basic)
      CFD Interface Type Velocity (CFD imposes GT pressure)
      CFD Interface Cross-section (be precise) Obtain from Neighboring 'Pipe*' Part
      CFD Domain Sampling Length Object Value: [dxi]

      This sets the Simcenter STAR-CCM+ volume-averaging zone length to the discretization length in GT-SUITE.

      Unit: See Case Setup (selected automatically)
    3. Click the Advanced tab and make sure that Species Map Override is set to def.
    4. Click OK.
  3. Drag and drop the CFDFlowConn > CFDConnection node from the project tree on to the model map and place it near the CFDInterface between InPipe04 and InPipe-cfd.
  4. Rename the CFDConnection to Intake.
  5. Join the components from the CFDInterface to the CFDConnection.


  6. Create another CFDConnection, with the following settings:
    Property/Attribute Setting
    Object Family CFDConnEGR
    Connection Type Gas (basic)
    CFD Interface Type Velocity (CFD imposes GT pressure)
    CFD Interface Cross-section (be precise) Obtain from Neighboring 'Pipe*' Part
    CFD Domain Sampling Length Object Value: [dxegr]
    Unit: See Case Setup (selected automatically)
    Species Map Override def
  7. Place and join the CFDConnEGR connection between the egr_pipe-1 and egr_pipe-2, and rename it to EGR.


  8. Create a final CFDConnection, with the following settings:
    Property/Attribute Setting
    Object Family CFDConnCyl
    Connection Type Gas (basic)
    CFD Interface Type Velocity (CFD imposes GT pressure)
    CFD Interface Cross-section (be precise) Obtain from Neighboring 'Pipe*' Part
    CFD Domain Sampling Length Object Value: [dxi]
    Unit: See Case Setup (selected automatically)
    Species Map Override def
  9. Place and join four CFDConnCyl connections between the remaining 1D/3D sections (for example, between InRunner-cfd-1 and InRunner01), and rename them to Cyl1, Cyl2, Cyl3, and Cyl4.


  10. Save the GT-SUITE model.