Periodic Boundaries for Hexa/Tetra-Mesh

sebastian · December 23, 2009, 06:01

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.
Thanks in advance!!

Sebastian

wake2e · December 23, 2009, 07:14

...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...

Abou ali · December 28, 2009, 07:29

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.

sebastian · January 11, 2010, 09:16

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

sebastian · January 21, 2010, 01:46

Thanks a lot, I think now I have solved my problems with your help!

December 23, 2009, 07:14	i know only the GAMBIT way - but it works	#2
wake2e New Member Join Date: Dec 2009 Location: Germany Posts: 6 Rep Power: 5	...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...

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December 28, 2009, 07:29		#3
Abou ali Member Join Date: Nov 2009 Posts: 39 Rep Power: 5	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, 09:16		#4
sebastian Member Sebastian Saegeler Join Date: Nov 2009 Location: Munich Posts: 70 Rep Power: 5	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, 01:46		#5
sebastian Member Sebastian Saegeler Join Date: Nov 2009 Location: Munich Posts: 70 Rep Power: 5	Thanks a lot, I think now I have solved my problems with your help!