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Help! mesh error- "only one adjacent cell thread."

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Old   April 6, 2005, 20:29
Default Help! mesh error- "only one adjacent cell thread."
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When loading a gmabit mesh into fluent i received the error "only one adjacent cell thread" for a group of lines i had defined as 'interior' within gambit. These lines were thence loaded into fluent as "wall" types rather than "internal." They are internal lines (part of the mesh) and cannot be walls.

Does anyone know how to fix this? I'm thinking some walls in gambit need to be altered somehow.
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Old   April 7, 2005, 06:51
Default Re: Help! mesh error- "only one adjacent cell thre
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That's happening because you only have a volume mesh on one side of the wall (or face mesh on one side of the edge in 2D... if you're working in 2D, whenever I say volume, it's a face in 2D, and whenever I say face, it's an edge in 2D). In your model you probably have mesh on both sides, but you did not connect the face so there are actually 2 faces sharing the same space. Since they aren't connected, gambit doesn't recognize the volume mesh on the opposite side. You have two options. The best option is to connect the faces, and you'll probably have to do some remeshing. If the faces are connected, they don't need a BC, gambit will recognize that they are internal, and will write the mesh as being continuous. The other option is to use the interface bc. Name each face (remember there are 2... one on top of the other, so i'll call them faceA and faceB) as its own interface bc, then in Fluent do Define->Grid Interfaces and you can tell it that faceA and faceB are an interface. Fluent claims there is no lose of accuracy when using a grid interface, but intuitively I would say "of course there is".

Hope this helps, and good luck, Jason
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Old   April 14, 2005, 10:56
Default Re: Help! mesh error- "only one adjacent cell thre
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Set them in gambit as wall,and the in fluent change boundary type.good luck
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Old   August 27, 2013, 05:02
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I know it's an old topic but I am in the same condition of Kuba but using ICEM.
How can I do to select and rename a face, as you suggested?

Thank you
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Old   August 27, 2013, 16:46
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The interior B.C is kind of wall between two fluid zones which let the flow exchange between these two zones directly. In fact, you can consider it "nothing"! Now, this error happens in two conditions: first: one of the zones is not correctly defined as fluid and the second and foremost, the interior face is sort of overlapped with another face. In fact, in this case you have two different faces which lay on each other and you can't distinct them easily. The latter one could be due to an incorrect splitting very often and it's kind of difficult to understand quickly. The solution is to connect the two faces via the corresponding tools embed in mesh modelers.
Hope it helps
Regard yours
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