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-   -   HELP please!!! ''note: separating wall zone into zones..'' - Import from ICEM (http://www.cfd-online.com/Forums/fluent/82102-help-please-note-separating-wall-zone-into-zones-import-icem.html)

Catthan November 16, 2010 19:04

HELP please!!! ''note: separating wall zone into zones..'' - Import from ICEM
 
Dear all,

I am modelling conjugate heat transfer from combustion process in a burner and when I import from ICEM, fluent 12 creates the coupled walls but separates some of them in other zones eg.

''separating wall zone 1_1 into zone 1_1 and zone 1 0.59''

most of the created zones are just a few cells or triangles..

I have a fluid volume region and a few solid regions for CHT.

Can you please tell me why this happens and how can I solve it?

It had happened to me in the past but I improved the mesh which now passes all the checks from ICEM but the wall separation happens in more walls than it did in the past.. :( :confused:

Any ideas?

Thanks in advance

jpo December 10, 2010 17:10

I have the same problem with one of my cases

Catthan December 13, 2010 05:52

Hi jpo,

I think I found the problem although have not managed to solve it 100%

So (at least for my cases), the separation happens either when there are surface elements that do not capture a surface or when then there are surfaces shared by two different parts.
The latter might be reasonable although there may be problems when setting BOCOs.
I haven't found a way to deal with that yet..
The bad surface elements can be eliminated by re-meshing and being careful when setting mesh sizes for each surface.
These are the causes of my problems and might not apply in your cases.

All the best

jpo December 13, 2010 09:01

thank you

I found out when I cut volumes with a face and then introduce interior and wall faces as needed, the problem in fluent disappears.

It is much more work in gambit to do it that way though :)

TDi December 13, 2010 14:12

I have had this same issue when importing from GAMBIT. In particular, when disconnected faces of a zone are imported, Fluent creates new wall zones. Dealing with the resulting setting of BC's is tedious, so I avoid changes to the mesh or I try to automate them with a script.


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