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Astrid June 23, 2006 06:34

periodicity in ICEM
 
Hi All,

I want to create a rotational periodic mesh in ICEM/Tetra. I found the Global Mesh Size parameters and have set this correctly. However, After meshing the mesh is not periodic. I can see that quite easily. And when I want to check the mesh on peridocity, I have to select which surfaces are periodic, and then ICEM tells me that there is no periodicity.

I think I have to select which surfaces are periodic. But where.............. I don't know.

Can anyone tell me?

Regards, Gert-Jan


Michael Bo Hansen June 23, 2006 06:52

Re: periodicity in ICEM
 
Mesh/ Set Global Mesh Size/ Set Up Periodicity.

Astrid June 23, 2006 06:58

Re: periodicity in ICEM
 
Hi Michael,

Yes, I have already found that. But where can I select the surfaces/parts that are periodic? I do not see a pull down menu or something like that. At least not such a selection menu with the different parts that I get when I want to check the periodicity after meshing (Edit Mesh/Check mesh/Periodicity).

Regards, Astrid


Michael Bo Hansen June 23, 2006 07:01

Re: periodicity in ICEM
 
As far as I know, you don't need to specify the surfaces explicit.

Astrid June 23, 2006 07:06

Re: periodicity in ICEM
 
I can't find it either. But I don't get a periodic mesh and the check mesh-option triggered me.......

Astrid

myron June 23, 2006 07:51

Re: periodicity in ICEM
 
Correct - you don't specify which geometry is periodic - the mesher determines that internally. Of course - the geometry also has to be periodic - matching the parameters mentioned in Global Mesh Size - Periodic.

It's also best to create a body/material point along the mid-plane of the periodic section. Then create the mesh - and it should be periodic.

KJS July 12, 2006 21:46

Re: periodicity in ICEM
 
Is this a hex or tet mesh? For a hexa mesh, in addition to specifying the periodicity as you have indicated, you have to manually 'set peiodic nodes'. That is you have to specify which node maps to which.

If a tet mesh, then you should only need what you have specified. Are you sure of the angle and axis you have specified is correct?


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