[ICEM] The pre-mesh quality is very good but the mesh quality is bad

lnk · July 27, 2012, 11:27

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

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

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

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

July 27, 2012, 11:27	The pre-mesh quality is very good but the mesh quality is bad	#1
lnk Senior Member lnk Join Date: Feb 2011 Location: Switzerland Posts: 118 Rep Power: 15	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

July 28, 2012, 08:08		#2
Anna Tian Senior Member Meimei Wang Join Date: Jul 2012 Posts: 494 Rep Power: 15	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. __________________ Best regards, Meimei

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[snappyHexMesh] No layers in a small gap	bobburnquist	OpenFOAM Meshing & Mesh Conversion	6	August 26, 2015 09:38
[snappyHexMesh] Layers:problem with curvature	giulio.topazio	OpenFOAM Meshing & Mesh Conversion	10	August 22, 2012 09:03
erroneous temps in conjugate model?	sieginc.	STAR-CCM+	11	July 14, 2012 03:41
[ICEM] Tetra mesh quality before and after prism layer	Chander	ANSYS Meshing & Geometry	0	December 25, 2011 22:04
unstructured vs. structured grids	Frank Muldoon	Main CFD Forum	1	January 5, 1999 10:09

July 30, 2012, 12:32		#3
Ananthakrishnan Senior Member Ananthakrishnan.A.S Join Date: Feb 2012 Location: Mumbai (Bombay), India Posts: 157 Rep Power: 16	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.

July 30, 2012, 14:08		#5
Ananthakrishnan Senior Member Ananthakrishnan.A.S Join Date: Feb 2012 Location: Mumbai (Bombay), India Posts: 157 Rep Power: 16	@ 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