Creating Regions and Interfaces

This simulation requires three regions—a fluid region that surrounds the exhaust pipe, a fluid region for the exhaust gas within the pipe, and a solid region for the attached shell parts. In order to transfer thermal information between the regions, you create the corresponding interfaces.

For this simulation, you create four interfaces:
  • an interface between the exhaust gas and fluid volume
  • an interface between the exhaust gas and attached shell parts
  • an interface between the attached shell parts and fluid volume
  • a hub interface for the attached shell parts
  1. To create a region for the fluid volume:
    1. Right-click the Geometry > Parts > Surface Wrapper (All Parts) node and select Set New Region....
    2. Set New Region Name to Fluid and click OK.
    3. Expand the Regions > Fluid > Boundaries node.
    4. Rename the Default node to Fluid Wall.
    5. Right-click the Boundaries node and create a new boundary named Inlet.
    6. For the Inlet boundary, set the following properties:
      Property Setting
      Part Surfaces Fluid Volume > Inlet
      Type Velocity Inlet
    7. Following the same procedure, create a boundary named Outlet and set the following properties:
      Property Setting
      Part Surfaces Fluid Volume > Outlet
      Type Pressure Outlet
  2. To create a region for the exhaust gas:
    1. Right-click the Geometry > Parts > Surface Wrapper (Exhaust) node and select Set Region > New....
    2. Set New Region Name to Exhaust Gas and click OK.
    3. Expand the Regions > Exhaust Gas > Boundaries node.
    4. Right-click the Boundaries node and create a new boundary named Inlets.
    5. For the Inlets boundary, set the following properties:
      Property Setting
      Part Surfaces
      • Inlet 1
      • Inlet 2
      Type Mass Flow Inlet
    6. Following the same procedure, create a boundary named Outlets and set the following properties:
      表 1.
      Property Setting
      Part Surfaces
      • Outlet 1
      • Outlet 2
      • Outlet 3
      • Outlet 4
      Type Wall

      The outlet faces interface with the outer fluid volume hence these boundaries are not classified as flow passages.

  3. To create a region for the attached shell parts:
    1. Right-click the Regions node and select New > Shell Region.
    2. Rename the node to Shells.
    3. Select the Regions > Shells node and click the custom editor for Parts.
    4. In the Shells - Parts dialog, select all the attached shells creator parts and click OK.
This simulation requires you to manually create four interfaces.
  1. To create an interface between the fluid and exhaust gas:
    1. Expand the Regions node and multi-select the Fluid and Exhaust Gas regions.
    2. Right-click one of the nodes and select Create Interface > Contact-Mode Boundary Interface.
    3. Select the Interfaces > Fluid/Exhaust Gas node and click the custom editor for Contacts.
    4. In the Fluid/Exhaust Gas - Contacts dialog, enter Outlet in the Filter by Path text box and select the following contacts from the result:
      Property Setting
      Contacts
      • Outlet 1. Outlet 1/Outlet 1.Outlet 1
      • Outlet 2. Outlet 2/Outlet 2.Outlet 2
      • Outlet 3. Outlet 3/Outlet 3.Outlet 3
      • Outlet 4. Outlet 4/Outlet 4.Outlet 4
    5. Click OK.
  2. Create an interface between the fluid and attached shell parts:
    1. Expand the Regions node and multi-select the Fluid and Shells regions.
    2. Right-click one of the nodes and select Create Interface > Contact-Mode Boundary Interface.
    3. Select the Interfaces > Fluid/Shells node and click the custom editor for Contacts.
    4. In the Fluid/Shells - Contacts dialog, select all the contacts and click OK.
    5. Select the Interfaces > Fluid/Shells node and set Type to Mapped Contact Interface.
  3. Create an interface between the exhaust gas and attached shell parts:
    1. Expand the Regions node and multi-select the Exhaust Gas and Shells regions.
    2. Right-click one of the nodes and select Create Interface > Contact-Mode Boundary Interface.
    3. Select the Interfaces > Exhaust Gas/Shells node and click the custom editor for Contacts.
    4. In the Exhaust Gas/Shells - Contacts dialog, select all the contacts and click OK.
    5. Select the Interfaces > Exhaust Gas/Shells node and set Type to Mapped Contact Interface.
For this simulation, you create a hub interface so that thermal data can be transferred between the shell parts.
  1. To create a hub interface for the attached shell parts:
    1. Right-click the Interfaces node and select New Hub Interface > Part Entity-Mode.
    2. Rename the node to Shells/Shells Hub.
    3. Select the Interfaces > Shells/Shells Hub node and click the custom editor for Part Entities.
    4. In the Shells/Shells Hub - Part Entities dialog, select all the attached shells creator parts and click OK.
  2. Save the simulation.