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

[ANSYS Meshing] Negative Cell Volumes

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 14, 2011, 04:05
Default Negative Cell Volumes
  #1
New Member
 
Join Date: Jun 2011
Posts: 5
Rep Power: 6
donkey86 is on a distinguished road
Hi there!

I am still trying to mesh a pipe with a radial inlet. Running quality checks
I get negative cell volumes on most of the edges. I tried adapting the spacing and ratio values but still no improvement. The associations of edges and vertices look fine as far as I know. Can somebody help me please?
donkey86 is offline   Reply With Quote

Old   June 14, 2011, 04:09
Default
  #2
New Member
 
Join Date: Jun 2011
Posts: 5
Rep Power: 6
donkey86 is on a distinguished road
there you have a screenshot
Attached Images
File Type: jpg Ansys Icem CFD .jpg (91.8 KB, 24 views)
donkey86 is offline   Reply With Quote

Old   June 14, 2011, 06:33
Default
  #3
New Member
 
Christa
Join Date: Apr 2011
Posts: 27
Rep Power: 6
user_of_cfx is on a distinguished road
I can't see the cross-section very well, are you using an O grid? It seems that where the inlet is the mesh gets unusually distorted, or maybe it's the angle with which I'm looking at it. Usually an O-grid will solve most of the problems near the edges. If the distortion I see is where the negative quality elements are, then this is a tell-tale sign that an O-grid is needed.

If you do have an O-grid and still get this, how did you create your geometry? Sometimes trying a different approach to get the same geometry solves some problems.

Hope it helps.
user_of_cfx is offline   Reply With Quote

Old   June 16, 2011, 02:26
Default
  #4
New Member
 
Join Date: Jun 2011
Posts: 5
Rep Power: 6
donkey86 is on a distinguished road
thanks for your help, I tweaked the geometry and solved my problems. now there is a smal amount of cells left, but I i am hopefull to get rid of them soon.
donkey86 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
BlockMesh FOAM warning gaottino OpenFOAM Native Meshers: blockMesh 7 July 19, 2010 14:11
Cells with t below lower limit Purushothama CD-adapco 2 May 31, 2010 21:58
Axisymmetrical mesh Rasmus Gjesing (Gjesing) OpenFOAM Native Meshers: blockMesh 10 April 2, 2007 14:00
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15
Warning 097- AB CD-adapco 6 November 15, 2004 05:41


All times are GMT -4. The time now is 10:26.