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cyclic boundary condition in OpenFOAM 1.6-ext

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Old   December 6, 2013, 05:44
Default cyclic boundary condition in OpenFOAM 1.6-ext
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Yu CAO
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Hi
Does any one who knows how to set cyclic boundary condition in OpenFoam 1.6-ext? It seems different from 2.1.0. I have tried several times but still does not work. Thank you.
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Old   December 7, 2013, 15:06
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ngj
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Niels Gjoel Jacobsen
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Hi Yu,

You can have a look in the following tutorial:

./incompressible/channelFoam/channel395/

Yes, the system is different, as the older versions of OF (OF-1.6-ext included) had the cyclic boundaries on the same patch, such that the cyclic patch has 2N faces in total. The first N faces below to one side of the patch and the other to the second half. Also note that it is required that face 0 matches face N, face 1 matches face N+1, etc.

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Niels
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Old   December 8, 2013, 06:25
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Yu CAO
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Quote:
Originally Posted by ngj View Post
Hi Yu,

You can have a look in the following tutorial:

./incompressible/channelFoam/channel395/

Yes, the system is different, as the older versions of OF (OF-1.6-ext included) had the cyclic boundaries on the same patch, such that the cyclic patch has 2N faces in total. The first N faces below to one side of the patch and the other to the second half. Also note that it is required that face 0 matches face N, face 1 matches face N+1, etc.

Kind regards,

Niels
Got it. Thank you very much.
Regards
Yu
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Old   December 9, 2013, 00:37
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Quote:
Originally Posted by cctv View Post
Got it. Thank you very much.
Regards
Yu
Dear Yu,
Have you dealt with the problem of cyclic boundary condition in the older version? I also encountered this and have not gotten the solution.
In the channel395 from tutorial, the sides are divided into two patches, one side1 and the other side2. What if put two sides into one patch? Do you have any advice.
Thanks in advance.
Best regards,
So
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Old   December 9, 2013, 17:49
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Yu CAO
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Originally Posted by caoyinyue View Post
Dear Yu,
Have you dealt with the problem of cyclic boundary condition in the older version? I also encountered this and have not gotten the solution.
In the channel395 from tutorial, the sides are divided into two patches, one side1 and the other side2. What if put two sides into one patch? Do you have any advice.
Thanks in advance.
Best regards,
So
I think cyclic boundary always appears in pairs. It means these two patches are presumed the same patch ,or you could regard these two patched are connected. one face could only belong to two cells at most, how could it belong to four cells if you put two side into one patch? Hoping what I said could be helpful to you.
Regards
Yu
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