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6.4.3 Using a Non-Conformal Grid in FLUENT

If your multiple-zone grid includes non-conformal boundaries, check if the grid meets all the requirements listed in Section  6.4.2). This ensures that FLUENT can obtain a solution on the mesh. Then do the following:

1.   Read the grid into FLUENT. If you have multiple grid files that have not yet been merged, first follow the instructions in Section  6.3.15 to merge them into a single grid.

2.   After reading in the grid, change the type of each pair of zones that comprises the non-conformal boundary to interface (as described in Section  7.1.3).

Define $\rightarrow$ Boundary Conditions...

3.   Define the non-conformal grid interfaces in the Grid Interfaces panel (Figure  6.4.7).

Define $\rightarrow$ Grid Interfaces...

Figure 6.4.7: The Grid Interfaces Panel

(a)   Enter a name for the interface in the Grid Interface field.

(b)   Specify the two interface zones that comprise the grid interface by selecting one or more zones in the Interface Zone 1 list and one or more zones in the Interface Zone 2 list.


If one of your interface zones is much smaller than the other, you should specify the smaller zone as Interface Zone 1 to improve the accuracy of the intersection calculation.

(c)   Set the Interface Type, if appropriate. There are two options:

  • Enable Periodic for periodic problems.


    Periodic is not a valid option when more than one zone is selected in each Interface Zone

  • Enable Coupled if the interface lies between a solid zone and a fluid zone, or if you would like to model a (thermally) coupled wall between two fluid zones using non-conformal interfaces.

(d)   Click on Create to create a new grid interface. For all types of interfaces, FLUENT will create boundary zones for the interface (e.g., wall-9, wall-10), which will appear under Boundary Zone 1 and Boundary Zone 2. If you have enabled the Coupled option, FLUENT will also create wall interface zones (e.g., wall-4, wall-4-shadow), which will appear under Interface Wall Zone 1 and Interface Wall Zone 2.

(e)   If the two interface zones did not overlap entirely, check the boundary zone type of the zone(s) created for the non-overlapping portion(s) of the boundary. If the zone type is not correct, you can use the Boundary Conditions panel to change it.

(f)   If you have any Coupled type interfaces, define boundary conditions (if relevant) by updating the interface wall zones in the Boundary Conditions panel.

Define $\rightarrow$ Boundary Conditions...

If you create an incorrect grid interface, you can select it in the Grid Interface list and click the Delete button to delete it. Any boundary zones or wall interface zones that were created when the interface was created will also be deleted. You may then proceed with the problem setup as usual.

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