Fluent Mesh read error
 

Hi,I created the mesh for Airfoil in Gambit and when I am trying to read it in FLUENT it gives me an error i.e. Cannot change gap-interior to interior because
there is only one adjacent cell thread. I have a tip clearance region in the geometry. and I defined the void region surfaces as interior. Can someone please tell me that How shall I define the faces. Thank you.

Sounds like a connectivity problem (explained with "One adjacent cell thread").
Back to Gambit and connect all your surfaces (3d) or edges (2d).
And remesh (if necessary)

Thanks Max,
Yes there was the connectivity problem. I edited the mesh, but still there is some problem in the Inlet and the Gap Volume. I hope I have problem because I am defining the Gap volume as interior in GAMBIT. I am using the fuse command to fuse the zones downstream and I have periodic boundary conditions. I will try changing the Mesh once more.

I could understand why you want to define any surface as interior (although you don't have to), but I don't understand why you try to define a volume as interior.
Anyway you cannot define a BC on a volume, except for porous zone, laminar zone etc... but the set up occures in a different panel than BC

Hi..
Sorry for my language. Here is the description. I made a grid for an airfoil. I created a 3D Mesh successfully. Then I needed a Casing at the top. I used the cooper tool for to create that it was created successfully. Now in that Gap region just above the Airfoil there is an interior i.e. the gap region. I defined that region as interior not the volume. WHen I read that mesh in Fluent it gave me an error. Than I defined the zones again and made them as wall and took them to fluent. This time it did not give me an error. Now after that I defined the periodic zones and the appropriate wall zones to interior. It worked but after running one time step when I am looking at a the gap region there is a velocity profile but there is no velocity profile on the symmetry. I dont understand why it is happening.

you don't have to define any region as interior.
Any meshed volume is automatically treated as fluid domain (except if you define a volume as porous, solid, etc...)
Post a picture of your stuff

Thanks Max. I figured out the problem. You were right. I was defining wrong zones as interiors. My simulation worked fine.