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[FAQ]

When creating a mesh interface between 2 zones, Fluent will look at what are the overlapping and non-overlapping sections between the different sides of the interface. If the interface connects different fluid zones, the following boundary zones will be created :
Interface Interior Zone : this corresponds to the overlapping section through which will go the fluid flow
Boundary Zone 1 and Boundary Zone 2 : those correspond to the non-overlapping sections for each of the connected zones.
If the interface connects different solid zones (Coupled Wall), the following boundary zones will be created :
Interface Wall Zone 1 and Interface Wall Zone 2 : this corresponds to the overlapping section, through which will occur the heat transfer, split into a wall and a wall shadow, for each of the connected zones.
Boundary Zone 1 and Boundary Zone 2 : those correspond to the non-overlapping sections for each of the connected zones For additional information, the interface creation procedure for non-conformal meshes is fully described in the section “Non-Conformal Meshes” of Fluent User Guide.