# Periodic Boundaries for Hexa/Tetra-Mesh

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December 23, 2009, 07:01
Periodic Boundaries for Hexa/Tetra-Mesh
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Sebastian Saegeler
Join Date: Nov 2009
Location: Munich
Posts: 70
Rep Power: 9
Dear all!

For my problem, I have meshed only a 45 degrees slice out of my 360 degree model.
Now I want to define my boundaries as periodic.

So far I have meshed it partly with hexas and two small other parts with tetras. As meshing tool I use ICEM 11.0, for my later calculations I will use Fluent V6.x or V12.0.

Can anybody tell me how can I now define both boundary surfaces as periodic? Do both 45 degree-sides have to have the exactly same mesh? Because that is not the case here. How can I realize that?

Furthermore, I already tried to load the mesh into Fluent. But Fluent cuts out my two tetra meshes (as can be seen in the pictures) and defines new surfaces. (In ICEM I named them Periodic_1, Fluent then produces Periodic_1, Periodic_1:001 and Periodic_1:002). Is this a problem? Of course it is the same for the 45 degree surface, Periodic_2.

I tried to explain my prob as good as possible. Please dont hesitate to ask for more details. It would be great, if anybody can help me.

Sebastian
Attached Images
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Last edited by sebastian; December 23, 2009 at 09:17.

 December 23, 2009, 08:14 i know only the GAMBIT way - but it works #2 New Member   Join Date: Dec 2009 Location: Germany Posts: 6 Rep Power: 9 ...in GAMBIT you have to link the faces for meshing to get the same mesh, then you can define a periodic boundary in GAMBIT. import that mesh in FLUENT and you will get a proper periodic boundary...

 December 28, 2009, 08:29 #3 Member   Join Date: Nov 2009 Posts: 49 Rep Power: 9 Hi,To define a periodic BC in Fluent, you must first define the appropriate boundaries as interfaces: go to Define/Boundary condition, select the surfaces and set them as Interface after that go to Define/Grid interfaces where must give a name of the interface, select tow surfaces and activate the periodic option. The answer of your question about the new surfaces created by Fluent, I think that there is no problem if you do the right definitions.

 January 11, 2010, 10:16 #4 Member   Sebastian Saegeler Join Date: Nov 2009 Location: Munich Posts: 70 Rep Power: 9 Thanks for the answers! I went on working on it today after christmas holidays. I guess I have to take two opposite surfaces. Selecting one in Interface Zone 1 and one in Interface Zone 2 and give them a name in the Grid Interface field. So I am doing that three times for my six surfaces that I want to make periodic. As I want the surfaces to be rotational periodic. Where can I select this? I did not find anything in the tutorial. Thanks and best wishes, Sebastian

 January 21, 2010, 02:46 #5 Member   Sebastian Saegeler Join Date: Nov 2009 Location: Munich Posts: 70 Rep Power: 9 Thanks a lot, I think now I have solved my problems with your help!

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