CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[ANSYS Meshing] Negative element quality but no negative elements

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   July 2, 2015, 12:32
Default Negative element quality but no negative elements
  #1
New Member
 
Join Date: Apr 2015
Posts: 8
Rep Power: 2
Shruti is on a distinguished road
Hi everyone,

When I checked my pre-mesh quality today, it showed 1 negative value, -0.094, but no negative elements. I am unsure what to make of this, and how should I get rid of negative quality in such a case?
I also checked the quality for unstructured mesh, and I got the same quality histogram.
Attached Images
File Type: png Quality Histogram.png (2.4 KB, 8 views)
Shruti is offline   Reply With Quote

Old   July 2, 2015, 18:54
Default
  #2
Senior Member
 
Join Date: Apr 2014
Location: Melbourne
Posts: 233
Rep Power: 4
Kapi is on a distinguished road
Hi Shruti,

Find out which part of your geometry has bad quality elements first, then use Sizing or any other way which suits your geometry and create a better mesh around that region.
This should solve your problem.

Cheers
KAPI
Kapi is offline   Reply With Quote

Old   July 3, 2015, 07:31
Default
  #3
New Member
 
Join Date: Apr 2015
Posts: 8
Rep Power: 2
Shruti is on a distinguished road
Actually, my geometry has about 3-4 sensitive regions which are problem areas. How would you suggest finding out which area has these negative values in such a case? When I had negative elements, I could simply click on them and find out.
Shruti is offline   Reply With Quote

Old   July 9, 2015, 01:27
Default
  #4
Senior Member
 
Join Date: Apr 2014
Location: Melbourne
Posts: 233
Rep Power: 4
Kapi is on a distinguished road
Hi Shruti,

Since you know there are 3-4 sensitive areas then tackle those areas and try to get best mesh possible in those area.
Once you have mesh, check if you are still getting negative value.
Even if you were not getting negative value, I would have suggested you to have good mesh around sensitive area, it gives you more accurate result.

Cheers
KAPI
Kapi is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Eliminating Negative Volume Elements Josh ANSYS Meshing & Geometry 16 July 9, 2014 13:01
Errors during blockMesh meshing Madeleine P. Vincent OpenFOAM Native Meshers: blockMesh 43 February 18, 2014 03:42
non-orthogonal faces and incorrect orientation? nennbs OpenFOAM Native Meshers: blockMesh 7 April 17, 2013 05:42
[ICEM] Hex refinement negative quality afterwards Anorky ANSYS Meshing & Geometry 8 March 22, 2010 04:25
Negative quality elements in ICEM Grid Kartik CFX 2 June 17, 2005 04:45


All times are GMT -4. The time now is 08:18.