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[ICEM] Different meshes from ICEM and GAMBIT

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Old   March 26, 2013, 05:38
Default Different meshes from ICEM and GAMBIT
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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:



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

GAMBIT:



ICEM:




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
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Old   March 27, 2013, 10:25
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Any suggestions for this?
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Old   March 27, 2013, 13:41
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Sijal Ahmed Memon (turboenginner@gmail.com)
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You want mesh in gambit or ICEM?
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Old   March 27, 2013, 15:18
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Quote:
Originally Posted by Far View Post
You want mesh in gambit or ICEM?
Hi Far,
I want it in ICEM.
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Old   March 27, 2013, 15:22
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use a smaller size for your elements
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New to ICEM CFD, try this document --> http://goo.gl/G2gkE
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Old   March 27, 2013, 15:36
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Quote:
Originally Posted by diamondx View Post
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
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Old   March 28, 2013, 20:18
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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.
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Old   March 29, 2013, 13:07
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Quote:
Originally Posted by asal View Post
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
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Old   March 29, 2013, 17:16
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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.
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Old   March 30, 2013, 03:42
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Quote:
Originally Posted by asal View Post
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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