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6.8.8 Replacing, Deleting, Deactivating, and Activating Zones

FLUENT allows you to append or replace the existing cell zone in the grid. You can also permanently delete a cell zone and all associated face zones, or temporarily deactivate and activate zones from your FLUENT case.



Replacing Zones


This feature allows you to replace a small region of a computational domain with a new region of different mesh quality. This functionality will be required where you may want to make changes to the geometry or mesh quality for any part of the domain. This ability of FLUENT is time saving since you can modify only the required part of the domain, without remeshing the whole domain every time. The replaced mesh will be conformal with that of the old mesh.

Replacing a zone is performed in the Replace Cell Zones panel (Figure  6.8.6).

Grid $\rightarrow$ Zone $\rightarrow$ Replace...

Figure 6.8.6: The Replace Cell Zones Panel
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For replacing the zones of the same type, do the following:

1.   Click Browse... and select the new or modified mesh containing the cell zone which will replace the cell zone in the current mesh.

  The zone names of the new mesh will be listed under the Replace with list box.

FLUENT checks for all face zones which have the same name as the face zones that were deleted and applies the old boundary conditions.

2.   Under Existing Zones, select the zone you want to replace. Note that the new cell zone might not have the same name as the old cell zone.

   FLUENT will first separate all the face zones which are connected to any undeleted zones in the current mesh. The deleted cell zone is now totally separated and can be deleted without affecting anything else.

3.   Under Replace with, select the zone from the newly read mesh.

4.   Click Replace to replace the selected zone.

FLUENT stitches the two-sided walls, creating sliding interfaces, and restores the condition of the mesh to its original form.



Deleting Zones


To permanently delete zones, select them in the Delete Cell Zones panel (Figure  6.8.7), and click Delete.

Grid $\rightarrow$ Zone $\rightarrow$ Delete...

Figure 6.8.7: The Delete Cell Zones Panel
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Deactivating Zones


To deactivate zones, select them in the Deactivate Cell Zones panel (Figure  6.8.8), and click Deactivate.

Grid $\rightarrow$ Zone $\rightarrow$ Deactivate...

Figure 6.8.8: The Deactivate Cell Zones Panel
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Deactivation will separate all relevant interior face zones (i.e., fan, interior, porous-jump, or radiator) into wall and wall-shadow pairs.

Note:   When you deactivate a zone using the Deactivate Cell Zones panel, FLUENT will remove the zone from the grid and from all relevant solver loops.

To deactivate selected cell zones in parallel

1.   Read in the data file, or initialize your solution.

2.   Select the zone(s) to be deactivated under Cell Zones.

3.   Click the Deactivate button.

figure   

If you have neither read in the data file, nor initialized the solution, prior to clicking the Deactivate button, then the selected cell zones will only be marked for deactivation. The zones will not be deactivated until data is read, or the solution is initialized.



Activating Zones


You can reactivate the zones and recover the last data available for them using the Activate Cell Zones panel (Figure  6.8.9) .

Grid $\rightarrow$ Zone $\rightarrow$ Activate...

Figure 6.8.9: The Activate Cell Zones Panel
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Note:   The Activate Cell Zones panel will only be populated with zones that were previously deactivated.

After reactivation, you need to make sure that the boundary conditions for the wall and wall-shadow pairs are restored correctly to what you assigned before deactivating the zones. If you plan to reactivate them at a later time, make sure that the face zones that are separated during deactivation are not modified. Adaption, however, is supported.

To activate selected cell zones in parallel

1.   Read in the data file, or initialize your solution.

2.   Select the zone(s) to be activated under Cell Zones.

3.   Click the Activate button.

figure   

If you have neither read in the data file, nor initialized the solution, prior to clicking the Activate button, then the selected cell zones will only be marked for activation. The zones will not be activated until data is read, or the solution is initialized.


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Up: 6.8 Modifying the Grid
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© Fluent Inc. 2006-09-20