CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > ANSYS Meshing & Geometry

[ICEM] Bad Mesh Quality in Hexa

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

Like Tree2Likes
  • 2 Post By kad

LinkBack Thread Tools Search this Thread Display Modes
Old   April 14, 2014, 07:11
Default Bad Mesh Quality in Hexa
New Member
Join Date: Apr 2013
Posts: 24
Rep Power: 12
Axlex is on a distinguished road
Hello everyone,

i have a problem meshing some easy geometry. In the attachment Geometry.png it is pictured. In picture BadElements.png you can see my problem.

As the bad elements are only on one side of the big cylinder, it should possible to get rid of them or to dont let them form in the first place.

I think this problem arises in the blocking process. The steps are:
1. create a single block around the geometry
2. O-grid for the the whole block
3. split the block into 2 parts for the cylinder and the pipe
4. project the outer edges to the big cylinder
5. project the inner edges to the pipe
6. align the edges of the inner block in the cylinder with that of the pipe
7. delete the o-grid blocks around the pipe
8. O-Grid for the inner block of the cylinder and the pipe

The attached Text file is a renamed ICEM Replay file, as they cannot be uploaded here in the forum. If one want have a look at the problem, just change the extension from txt to rpl and load it in ICEM via File -> Replay Scripts -> Run from Script File. I put in some comments at the single steps. The first part is the geometry and the second part is the blocking. To see the bad elements, select the tab Blocking -> Pre-Mesh Quality Histograms.

I would be grateful for any suggestions.
Attached Images
File Type: jpg Geometry.jpg (21.0 KB, 54 views)
File Type: jpg BadElements.jpg (51.8 KB, 58 views)
Attached Files
File Type: txt CylinderPipe.txt (7.5 KB, 13 views)
Axlex is offline   Reply With Quote

Old   April 14, 2014, 09:13
Senior Member
Join Date: Feb 2013
Location: Germany
Posts: 200
Rep Power: 23
kad will become famous soon enoughkad will become famous soon enough
Your mesh sizes are near the triangulation tolerance defined under settings->model. Decrease this tolerance by let's say three orders of magnitude. Then run the replay script and you'll be fine .
kad is offline   Reply With Quote

Old   April 14, 2014, 10:03
New Member
Join Date: Apr 2013
Posts: 24
Rep Power: 12
Axlex is on a distinguished road
Well, i feel relieved and shocked at once by the simplicity of the solution. For remeshing purposes i will include a line for this, to make sure it doesn't change.

Thank you very much for the fast answer.
Axlex is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Hexa mesh, curve mesh setup, bunching law Anorky ANSYS Meshing & Geometry 4 November 12, 2014 00:27
Mesh Quality good or bad? RealENG22 FLUENT 5 September 8, 2013 07:36
[ICEM] improving mesh quality kannstmasehn ANSYS Meshing & Geometry 8 April 29, 2013 05:28
[ICEM] mesh in-dependency and mesh quality control sujay ANSYS Meshing & Geometry 0 February 20, 2013 02:06
[ICEM] Problem making structural mesh on a surface froztbear ANSYS Meshing & Geometry 1 November 10, 2011 08:52

All times are GMT -4. The time now is 17:50.