[abhinavgupta88]

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.

[-mAx-]

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)

[abhinavgupta88]

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.

[-mAx-]

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

[abhinavgupta88]

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.

[-mAx-]

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

[abhinavgupta88]

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