I have created 3 different subdomains and done the meshing independently on 3 different subdomains. After saving the mesh file independently I have imported them in the Ansys fluent.

When I checked the data at interface plane, I found that no data is transferring across the interface.

What may be the reason and possible solution for this?

Please find the attachment of burner where you can see interfacing region between white colour and red colour region.