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-   -   [ICEM] The pre-mesh quality is very good but the mesh quality is bad (http://www.cfd-online.com/Forums/ansys-meshing/105320-pre-mesh-quality-very-good-but-mesh-quality-bad.html)

lnk July 27, 2012 11:27

The pre-mesh quality is very good but the mesh quality is bad
 
Hi everyone,

Here is my question about mesh generation by ICEM. My pre-mesh quality is very good by the button 'check pre-mesh quality' . But after I convert it to mesh, the mesh quality is very bad by the button 'display mesh quality'. Should I go back to block to redo my block to solve this problem? Or I can trust the 'pre-mesh quality' and run the case directly?

Best regards and many thanks,
lnk

Anna Tian July 28, 2012 08:08

I also have this problem sometimes. You may check the Pre-mesh quality. It may also not good anymore. Sometimes if you save and close a project and then open again, something changes.

Ananthakrishnan July 30, 2012 12:32

Hi.
You dont have to necessarily redo the mesh. You can very well trust the pre mesh quality. Its because, ICEM does not check the mesh with the same parameters in structured (premesh) and unstructured cases(dislplay mesh quality).

Anna Tian,
I have never witnessed anything like that.. I think something else is happening.

Far July 30, 2012 13:58

Quote:

Originally Posted by Anna Tian (Post 374105)
I also have this problem sometimes. You may check the Pre-mesh quality. It may also not good anymore. Sometimes if you save and close a project and then open again, something changes.

I get this problem frequently. What I do is " I use to unchecke the solid and VORFN blocks" This always works for me

Ananthakrishnan July 30, 2012 14:08

@ far,
is it?? but i read that it is not required to check the structured mesh quality after converting to unstructured mesh.. is it not enough if i just check the pre mesh

Far July 30, 2012 14:11

Question:
Quote:

Originally Posted by Anna Tian (Post 374105)
I also have this problem sometimes. You may check the Pre-mesh quality. It may also not good anymore. Sometimes if you save and close a project and then open again, something changes.

Response:
Quote:

Originally Posted by Far (Post 374392)
I get this problem frequently. What I do is " I use to unchecke the solid and VORFN blocks" This always works for me

Quote:

@ far,
is it?? but i read that it is not required to check the structured mesh quality after converting to unstructured mesh.. is it not enough if i just check the pre mesh
I always found that the premesh quality is same as I get in Fluent or CFX


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