Open the Auto Mesh dialog box from the context-sensitive menu available by right-clicking on any mesh object or its Volumetric Regions or Cell Zones branch in the tree.

You can also use the Mesh > Auto Mesh menu item to open the Auto Mesh dialog box.

Ensure that the mesh object is selected in the Object drop-down list.

Enable/disable the Keep Solid Cell Zones option, as appropriate.

Select the appropriate option in the Grow Prisms drop-down list in the Boundary Layer Mesh group box.

1. Retain the default selection of none if you do not need to grow prism layers for the current meshing approach.

2. Select scoped if you want to specify object-based prism controls. Click Set... to open the Scoped Prisms dialog box and define the prism controls for the mesh object. Refer to Prism Meshing Options for Scoped Prisms for details.

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   Tip:  You can save your scoped prism controls to a file (*.pzmcontrol) for use in batch mode, or read in a previously saved scoped prism file.

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Set the Poly-Hexcore mesh parameters.

Select the Poly-Hexcore option from the Volume Fill list and set the following Volume Fill Options.

Click the Set... button to open the Poly-Hexcore Controls dialog box.

1. Select the Avoid 1:8 Cell Jump in Hexcore option to eliminate the 1:8 cell transition that can occur in the hexcore region. When enabled, use the Replace (With Polyhedra) drop-down menu to select whether just large cells, just small cells, or if both types of cells are to be replaced with polyhedra cells in the hexcore transition.

   You can also use the corresponding text command: mesh/poly-hexcore/controls/avoid-1:8-cell-jump-in-hexcore.

2. Select the Mark Core Region Cell Type as Hex to have only hexcore cells within the core of the volume mesh.

   You can also use the corresponding text command: mesh/poly-hexcore/controls/mark-core-region-cell-type-as-hex?. The default value is yes. 

3. Select the Only Polyhedra for Selected Regions to assign polyhedra only to selective regions. This option is available only if you have first computed your region(s).

   Once this option is enabled, you need to choose a specific mesh object and your regions. For the specified Mesh Object, identify the Largest Region or click Compute to calculate the largest region. Once determined, the selected region becomes the active region.

   For Select Regions (Largest Region Excluded), you can choose All fluid regions, All solid regions, or other. Fluent automatically excludes the largest region from the listing of available regions to choose.

   When you choose other, the Selected Regions field is available so that you can specify one or more regions. Enter the region name(s), or use the ... button to open the Volume Scope Poly dialog.

   In the Volume Scope Poly dialog, you can select one or more regions, using the Draw button to visualize the regions prior to selection. Once you have selected your region(s), click OK, and those selections will be displayed as Selected Regions in the Poly Hexcore Controls dialog.

   You can also use the corresponding text command: mesh/poly-hexcore/controls/only-polyhedra-for-selected-regions. For example:

   Meshing/mesh/poly-hexcore/controls> only-polyhedra-for-selected-regions
   Mesh object [""] part-1
   only-polyhedra-for-selected-regions? [yes] yes
   Do you want to specify the largest volume region or compute? [yes] yes
   
   Largest volume region name [""] "region_2"
   
   Select regions: [other]>--> other
   Use the following list and enter a valid region name for the mesh object "part-1" (Largest Region Excluded).
   (region_1)
   Region name [""] "region_1"
   Region name [""] 
   
   Meshing/mesh/poly-hexcore/controls>

Return to the Auto Mesh dialog box and enable or disable additional Options as desired.

1. Enable Merge Cell Zones within Regions to create a single cell zone within a region, or disable to keep the cell zones separate.

Click Mesh in the Auto Mesh dialog box.