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

[ICEM] Problem vt unstructured meshing

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 7, 2010, 06:37
Default Problem vt unstructured meshing
  #1
Member
 
Raghav
Join Date: Jul 2010
Location: India, Karnataka
Posts: 47
Rep Power: 17
raghav is on a distinguished road
hi
i imported the geometry from catia.
these are the problems i faced after meshing. it is according to the images attached.

1. Some parts like outer cylinder are not meshed. After meshing the unmeshed parts using " mesh by parts" option, these parts carried the mesh elements while i imported it to CFX.

2. after using "build topology" some curves were highlighted by yellow colour. during mesh process it prompted a message " geometry has holes". this was referring to the highlighted yellow curves.

3. before mesh the geometry was like in the fig 3

4. after mesh the holes in the geometry were filled

please suggest me what have to be done to have a whole geometry meshed with no errors.

thanks
raghav
Attached Images
File Type: jpg 1.some parts unmeshed.jpg (45.5 KB, 16 views)
File Type: jpg 2.wireframe_build topology003.jpg (65.0 KB, 14 views)
File Type: jpg 3.before mesh.jpg (33.3 KB, 14 views)
File Type: jpg 4.after mesh.jpg (70.7 KB, 10 views)
File Type: jpg 5.inner cyl.jpg (31.4 KB, 13 views)
raghav is offline   Reply With Quote

Old   October 8, 2010, 13:21
Default ICEM Help
  #2
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
1) The outer section probably didn't mesh because it didn't have its own material point... During the flood fill process, the software assumed that since you didn't create a material point, you were not interested in that region, so the mesh there was deleted. The fix is to create a material point in that region (and any others which you are interested in... If you use the "mesh by parts" option, each part is meshed on its own, but without the connectivity your probably want (so don't do that unless you are wanting a mechanical assembly mesh that you will join with contact elements).

2) The yellow edges mean you have a gap (or at least a single edge like a baffle) that is larger than your build topology tolerance. You pictures don't let me see what is going on near those yellow edges, so you will need to decide if they need to be repaired or not. Perhaps simply increasing your tolerance would sort out the problem, just make sure that the gap distance is less than your mesh size.

Of course, this is all covered very well in the training course... Attend one if you can. If not, at least go thru the tutorials. You may find those built into the software install (under Help => Tutorials) or on the Customer Portal...
PSYMN is offline   Reply With Quote

Reply

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
[GAMBIT] fac meshing problem, not skewness bugra ANSYS Meshing & Geometry 0 September 3, 2010 08:40
[GAMBIT] 3d boundary layer meshing problem bugra ANSYS Meshing & Geometry 0 August 24, 2010 09:13
Difficulty meshing a two region problem james15 STAR-CCM+ 5 August 19, 2010 02:10
Help -problem with meshing marbro ANSYS 0 June 13, 2010 07:41
Meshing problem in GAMBIT Vidya Raja FLUENT 0 May 21, 2006 00:31


All times are GMT -4. The time now is 01:16.