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-   -   [ICEM] Different meshes from ICEM and GAMBIT (http://www.cfd-online.com/Forums/ansys-meshing/115209-different-meshes-icem-gambit.html)

Mojtaba.a March 26, 2013 05:38

Different meshes from ICEM and GAMBIT
 
Hi, i'm a beginner in ICEM and have a little problem in meshing. maybe this is a stupid question but I couldn't find any threads covering this issue, If there is any, please suggest it :)
Well I have this complex geometry that I have meshed in both Gambit and ICEM but with different mesh results.
Here are the images:
This one is a round step-shaped geometry which is meshed fine in Gambit but not in ICEM:

Gambit:


ICEM:

http://amiraslanpoor.persiangig.com/step-ic.jpg

Similary, here are the images of a meshed pillar-shaped geometry, Both meshed using GAMBIT and ICEM:

GAMBIT:

http://amiraslanpoor.persiangig.com/pillar-gam.jpg

ICEM:

http://amiraslanpoor.persiangig.com/pillar-ic.jpg


As you can see there are lots of differences between these two meshes.I am unable to get that fine mesh using ICEM.

I tried these:
1) importing Gambit mesh into ICEM and tried to understand how can I do these steps to mesh my geometry:
---a) delete volume mesh
---b) keeping face meshes
---c) do my preferred edits
---d) volume mesh it

Tried a lot, but No Idea how to do these steps! in other words I don't know how to continue meshing a pre-meshed GAMBIT file in ICEM (is it even possible?)

2) I even tried to use Quad dominant mesh type, But as I read some forum posts, I figured out that it is not suitable for CFD cases.

Any help is appreciated,
bests
Mojtaba

Mojtaba.a March 27, 2013 10:25

Any suggestions for this?

Far March 27, 2013 13:41

You want mesh in gambit or ICEM?

Mojtaba.a March 27, 2013 15:18

Quote:

Originally Posted by Far (Post 416806)
You want mesh in gambit or ICEM?

Hi Far,
I want it in ICEM.

diamondx March 27, 2013 15:22

use a smaller size for your elements

Mojtaba.a March 27, 2013 15:36

Quote:

Originally Posted by diamondx (Post 416823)
use a smaller size for your elements

Hi Ali,
Well that's not the problem. even by reducing mesh size I still can't get a mesh volume like GAMBIT. the other problem is that reducing size too much causes huge number of cells, which I'm trying to avoid.
I wonder if there are any particular meshing procedures in ICEM which i'm not aware of.

best

asal March 28, 2013 20:18

Hello.

Why you are interesting tetra mesh rather than hexa? Use the block strategy to generate hexa mesh. It will generate precise mesh with less elements compare to tetra.

Mojtaba.a March 29, 2013 13:07

Quote:

Originally Posted by asal (Post 417099)
Hello.

Why you are interesting tetra mesh rather than hexa? Use the block strategy to generate hexa mesh. It will generate precise mesh with less elements compare to tetra.

Hi Astio,
I will try that. but right now I have no idea what blocking is! maybe I need some study.

Tnx

asal March 29, 2013 17:16

Try some tutorials. you can find ICEM manual in the internet. Also take a look on this:
https://www.youtube.com/watch?v=9h97FvWJPcY

If still you have a problem, share your geometry, I will help you.

Mojtaba.a March 30, 2013 03:42

Quote:

Originally Posted by asal (Post 417247)
Try some tutorials. you can find ICEM manual in the internet. Also take a look on this:
https://www.youtube.com/watch?v=9h97FvWJPcY

If still you have a problem, share your geometry, I will help you.

Thank you Astio.
those tutorials helped a lot.
I wil try meshing my geometry again to see what happens.

bests


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