# Zero thickness boundary inside a 3D mesh

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 August 30, 2004, 05:25 Zero thickness boundary inside a 3D mesh #1 Tessaratto Guest   Posts: n/a Does anyone be experienced with modeling a zero thickness wall, like a baffle or a flat plate, inside a 3D meshed domain using GAMBIT? Thanks. Tessaratto

 August 30, 2004, 05:55 Re: Zero thickness boundary inside a 3D mesh #2 A. Awad Guest   Posts: n/a have you tried to use an inlet bc with zero velocity

 August 30, 2004, 06:35 Re: Zero thickness boundary inside a 3D mesh #3 Tessaratto Guest   Posts: n/a Dear A.Awad, thanks for answering. I have the following approaching problem: given a 3D domain in which I put some zero-thick obstacle, let's find out the best (or even a good one) procedure to model it, topologically speaking, and to assign the right b.c. on it! I guess I can't assign neither an inlet bc nor a wall because I have no frontier topology where there is the zero-thick obstacle. I don't know if it's possible to assign a bc inside a generated mesh with GAMBIT's tools. Any idea? Thanks. T.

 August 30, 2004, 08:25 Re: Zero thickness boundary inside a 3D mesh #4 STK Guest   Posts: n/a hello. I understand dwhat you want to do. The only solution to that is the interior b.c. and afterwards in fluent you characterize it as a wall b.c. i have done it. The problem is that you have to connect this edge with others (it has to be meshed), so there will not be totally interior. But you can split this edge to 3 for example edges, which two of the will be just interior and the internal edge wall b.c.

 August 30, 2004, 09:10 Re: Zero thickness boundary inside a 3D mesh #5 Tessaratto Guest   Posts: n/a Hi STK, thanks for answering. I agree with u talking about generating an interior b.c. to define my problem. I'd like to better understand if i should disconnect the zero thick wall surface from the 3D domain before generating mesh or if i should try to mesh the two-sided wall in different manner to obtain an interior b.c. entity importing the mesh into fluent. I've not clear idea about procedure to generate this obstacle. You talked about disconnected edges. Don't you generate also the faces delimiting the obstacle? Suppose my obstacle is a rectangular solid plate immersed in a generic 3d fluid domain. Could you please give me a synthetic procedure to model it? Nice of you. Tessaratto

 August 30, 2004, 18:37 Re: Zero thickness boundary inside a 3D mesh #6 stk Guest   Posts: n/a hi! try meshing the two-sided wall to obtain an interior b.c., which will be a zero thickness wall, because you will create a surface and not a volume. good luck

 September 5, 2004, 13:51 Re: Zero thickness boundary inside a 3D mesh #7 Tessaratto Guest   Posts: n/a Hi STK, I've built mesh on the two-sided wall but don't know how to create the volume mesh because the topology "doesn't feel" the disconnection inside. Any other suggestion will be appreciated. Thanks. Tessaratto

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