Overset Grid Solutions from Fluent


FAQs with Fluent Overset post processing in EnSight:

While in Fluent, PRIOR to running your calculation:
1. You need to export your solution to EnSight format from Fluent. As these are typically transient, make sure you do this prior to running your calculation.

2. Given that the flags for overset are elemental based, to get the best presentation of data in EnSight, it is advised to export "Cell Centerd" data during your export to EnSight format, NOT the "Node" variables (which is default).

3. Ensure that during your export to EnSight format, you export the "Overset Cell Type" variable. It is this variable that EnSight will use to Filter out elements from the overset domain.

Within EnSight:
4. Once you have read the model into EnSight, the default view will be ALL of the domain. In order to see the overset domain only, you need to utilize the "Element Filtering" capability, and choose an appropriate threshold value. To do so:
a. select all model parts.
b. Open the Element Filtering dialog (Quick Action Icon which appears like a filter, at the top-right).
c. Activate the "Active" toggle for "Filter 1".
d. Choose the elemental variable called "overset_cell_type".
e. Specify the operand to be less than ("<")
f. Specify a value of 0.10 (This will filter out ALL elements with Overset_Cell_Type < 0.10).
g. Click on the "Apply" button in the Element Filtering Dialog box.

An overset_cell_type < 0.10 should provide a good default, as it will filter "out" any Receptor(0), Orphan(-1), or Dead(-2) elements.
You can change this value to be -0.10 to allow to see "Receptor" elements if desired.

5. Post processing can continue as normal. Beware that calculations based on integrating, summation, averages, etc will be affected by the existence of overlapping domains.

6. Note that Element Filtering does not effect nodes. All nodes remain in domain, regardless of whether they are connected to any remaining elements. Therefore, calculations using nodes will not be correct.

Overset_Cell_Type Value, Meaning
2, donor
1, solve
0, receptor
-1, orphan
-2, dead

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