When you export a mesh into the Ansys Fluent, Polyflow, CGNS, or Ansys ICEM CFD format, or as a faceted geometry for use in Ansys Fluent Meshing, each Named Selection must be unique. That is, the entities (bodies, faces, or edges) in one Named Selection cannot also exist in a second Named Selection. Any entity that is in two or more Named Selections is considered overlapping. The overlapping entities need to be resolved before the mesh can be exported.
Note: Any Named Selection whose Send to Solver option is set to No is skipped during the processing described above. For this reason, an easy way to avoid overlapping Named Selections is to set all values of Send to Solver to No.
If a mesh fails to export and an error about overlapping Named Selections occurs, you can display the overlapping entities by right-clicking on the Mesh object in the Tree Outline and choosing >. You can then inspect the Named Selections to remove the duplicate (overlapping) entities and proceed with exporting the mesh.
Alternatively, you can repair the overlapping Named Selections automatically by right-clicking on the Named Selections folder and choosing Repair Overlapping Named Selections. This option checks all Named Selections (for which Send to Solver is set to Yes) in the order in which they appear in the Tree (top to bottom). When it encounters an overlapping Named Selection, it moves that Named Selection to a new folder called Overlapping Named Selections and sets its Send to Solver option to No. You can delete the Overlapping Named Selections folder.
The repaired Named Selections are placed at the bottom of the Tree and their names are prefixed with Repaired. To repair a Named Selection, the Meshing application removes any duplicate (overlapping) entities from the Named Selection and sets its Send to Solver option to Yes.
Note:
In cases where you want overlapping Named Selections to be converted to Ansys ICEM CFD parts, the overlapping subsets can be cleaned in Ansys ICEM CFD and then converted into parts.
If you are using Named Selections for mesh settings (such as sizing), set the Send to Solver option for these Named Selections to No so that they are skipped when the check for overlapping Named Selections is performed. Otherwise, the check may cause the mesh state to go out-of-date.