Use TUI command to slit wall-interior
define/boundary-conditions/modify-zones/slit-face-zone wall-interior
By default, Fluent used one-to-one pairing for Mesh interface creation, but to be sure you can enter define/mesh-interfaces/one-to-one-pairing? yes
Go to Mesh > Interfaces and create an interface between wall-interior and wall-interior-slit. You should now find that the mesh interface is set to type Interior.
You are navigating away from the AIS Discovery experience