CFD Online Discussion Forums

CFD Online Discussion Forums (
-   ANSYS Meshing & Geometry (
-   -   [GAMBIT] How to name inner domain in Gambit (

izna October 23, 2013 10:54

How to name inner domain in Gambit

I have a large domain D.. I have one shape,S ( exotic shape) in my large domain.. I had drawn another small domain,X to surround my exotic shape so that i can mesh finest mesh around this and coarser elsewhere..

In gambit i had done X subtract S, then i retain both faces.. Next I did, D subtract X...

I had meshed my small Domain X finely and the bigger coarse.. everything was fine..

problem is my boundary condition.. what do I name the inner domain?
please help..

-mAx- October 24, 2013 00:51

don't give any name of internal domain.

izna October 24, 2013 02:04

If i do not name it.. In openFoam, it is taken as default Wall..

Please advice.

-mAx- October 24, 2013 02:14

You were talking about inner domain. So I understand a volume.
Then I assume you have wall between your default domain D and you refined domain X.
This is typical connectivity problem.
So you have to connect those surfaces
A picture is always welcomed

izna October 24, 2013 02:16

hi its in 2D..

izna October 24, 2013 02:30

inner shapes are wall..

-mAx- October 24, 2013 08:13

If you are working in 2d then bc are set on edges. (so you have to connect your edges)
I don't see anything on your picture

izna October 24, 2013 14:30

when i do connec the edges i obtain the attached error..

I want wall only the buildings..
i have subtract the small square( domain) from the big domain.. and subtract the buildings from the small square domain..

-mAx- October 25, 2013 00:34

upload your dbs file in a share server, I'll check

-mAx- October 25, 2013 03:40

1 Attachment(s)
Ok as I thought: you didn't have any split.
- go to face substract, and select face.2 as "face", then select all faces (except face .2 and face.1) in "substract faces"

-Now you have only 2 faces: face.2 (the one you generated with substract) and face.1, which you will use for the split

-go to face split, and selet face.2 in "face", and face.1 in "faces"

Now your domain is ready, you can mesh
Attachment 26361

izna October 25, 2013 03:47

you mean now on doing this, i can name my edges and not bother with the inner square?
also in


go to face split, and selet face.2 in "face", and face.1 in "faces"
in my version of gambit, i have both as face.. firstone face and secondone also face.. whch one do i put as face2 and which one face1

-mAx- October 25, 2013 04:02

you just have to select the faces:
the first ("face") is the surface from which you want to generate a split.
The other ("faces") is the surface (or surfaces) you want to use for splitting

izna October 25, 2013 04:05

So for me
face2 is the first and face1 is the second..


-mAx- October 25, 2013 04:17


Originally Posted by -mAx- (Post 458920)
-go to face split, and selet face.2 in "face", and face.1 in "faces"

Also for me...:D

izna October 26, 2013 16:05

Hi max

Hwo do i close my volume?
when i do stitch volume, i got the error of

cannot create acis body. is this an open shell?
I have all the required face..:(

-mAx- October 28, 2013 02:02

you have to create each volume and then again the substract and split stuff (but with volume)

izna October 28, 2013 09:13

hi max
thanks for a reply..
When i create volumes.. Ie stitch all my face together.. i obtain the Acis error..:(

-mAx- October 29, 2013 02:56

give me an example

All times are GMT -4. The time now is 17:03.