Defining Mesh Operations

To avoid unnecessary data interpolation across the solid-fluid interface, you are advised to generate conformal interfaces if possible. To achieve this, all regions must be meshed within the same mesh operation without activating Per-Part Meshing.

You define an Automated Mesh Operation that includes a Polyhedral Mesher for the fluid region and a compatible Thin Mesher for the exhaust manifold region. In the Solid Region exhaust manifold, as no flow is solved, the prism layers are disabled. In the Fluid Region, the Thin Mesher must be deactivated to ensure the Prism Layer Mesher works properly.

To generate the mesh:

  1. Right-click the Geometry > Operations node and select New > Mesh > Automated Mesh.
  2. In the Create Automated Mesh Operation dialog:
    1. Select the following properties:
      Group Mesher
      Parts Gas, Manifold (Thermal)
      Surface Meshers Surface Remesher
      Core Volume Meshers Polyhedral Mesher
      Optional Volume Mesher Thin Mesher
      Optional Boundary Layer Meshers Prism Layer Mesher
    2. Click OK.
    3. Edit the Automated Mesh > Meshers > Thin Mesher node and active the Customize Thickness Threshold property.
    4. Edit the Automated Mesh > Default Controls node and set the following properties:
      Node Property Setting
      Default Controls
      Base Size Base Size 5 mm
      Minimum Surface Size Percentage of Base 30
      Number of Thin Layers Number of Layers 3
      Thin Mesher Maximum Thickness Percentage of Base 200
      Core Mesh Optimization Optimization Cycles 2
      Quality Threshold 0.7
      Prism Layer Controls Number of Prism Layers 5
      Near Core Layer Aspect Ratio 0.5
      Prism Layer Total Thickness Percentage of Base 33
To create Custom Controls:
  1. Create a surface control that disables the prism layers in the solid part Manifold (Thermal):
    1. Right-click the Custom Controls node and select New > Surface Control.
    2. Rename the Surface Control node to Disable Prism.
    3. Select the Disable Prism node and set Part Surface to Manifold (Thermal) as a Part, and Gas > inlets, Gas > outlet as Part Surfaces.
    4. Select the Disable Prism > Controls > Prism Layers node and set Prism Layers to Disable.
  2. Create a part control that disables the thin mesher in the fluid part Gas:
    1. Right-click the Custom Controls node and select New > Part Control.
    2. Rename the Part Control node to Disable Thin.
    3. Select the Disable Thin node and set Part to Gas.
    4. Select the Disable Thin > Controls > Thin mesher node and set Thin Mesher to Disable.
  3. Right-click the Operations > Automated Mesh node and select Execute.


  4. Save the simulation with the generated mesh.