mergeMeshes does not issue warning when it merges two grids having patches with the same name
Say, the user has two different grids which contains the following patches with these names:
7( inlet outlet left right top bottom sameNamePatch)
2( obstacle sameNamePatch)
The below command (OpenFOAM v1706) is then executed.
mergeMeshes Grid1Path Grid2Path -overwrite
No warning messages were issued. Now, merged grid containing:
8( inlet outlet left right top bottom obstacle sameNamePatch)
Despite topologically different patches, sameNamePatch patches from the both grids were combined only based on their names. At times, this might be useful. Yet, IMHO, it might also be error-prone leaving the user unwarned about what has happened.