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

CAD model sliver faces - CFX Mesh - Parasolid?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 5, 2009, 06:17
Default CAD model sliver faces - CFX Mesh - Parasolid?
  #1
Ianto
Guest
 
Posts: n/a
Dear All,

I'm using CFX mesh and have had problems with sliver edges on every Solidworks model I've analysed. Having some experience with Solidworks, I also realise how difficult it is to produce a model of any complexity without their appearance somewhere along the way.

Combining slivers into larger virtual faces in Mesh circumvents the problem, but is a very slow process as the virtual faces themselves can cause problems with meshing - the best approach to creating them is to attempt a mesh after each new virtual face (and only combine two faces at a time). This way if a virtual face is causing a problem it can be identified and deleted easily, otherwise you have to go through a process of elimination - deleting one at a time, and in fact, I've had to delete all in the past and start again as the problem can be impossible to track down.

Needless to say this is a painstaking process and very time consuming.

It's been suggested that saving the model as a parasolid before importing to CFX Mesh might help as it removes the history of how the CAD model was built, and the sliver faces with it - the model just becomes one solid lump as I understand it. I wondered if anyone has any experience/thoughts on this, or indeed any other suggestion to speed up the meshing process?

Many thanks,

Ianto
  Reply With Quote

Old   February 5, 2009, 14:40
Default Re: CAD model sliver faces - CFX Mesh - Parasolid?
  #2
cfdguy
Guest
 
Posts: n/a
CAD clean up and Meshing usually take about 60% all the work on industry problems, unfortunately.

When I started on Pro-Engineer I used to need some virtual topology in Workbench. Now, I don't need them anymore. I think it is much easier when you fix things inside the CAD program. Much hard work, though.

Parasolid, IGES, etc, are all representations of the model coming from the CAD program. They can't help you when the 1st is not suitable for a CFD mesher.

Cheers!
  Reply With Quote

Old   February 6, 2009, 04:03
Default Re: CAD model sliver faces - CFX Mesh - Parasolid?
  #3
Ianto
Guest
 
Posts: n/a
Ah, okay... I guess there's room for improvement on the CAD technique front then but I can still expect to spend a lot of time repairing models!

Thanks for you response.

Ianto
  Reply With Quote

Old   February 8, 2009, 19:32
Default Re: CAD model sliver faces - CFX Mesh - Parasolid?
  #4
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

In workbench use the patch independant mesher. It is ideal for messy CAD. If that does not have enough options consider going to ICEM. It is the best mesher available for messy CAD and handles it far better than WB.

Glenn Horrocks
  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
Problem importing watertight model into CFX djk1301 ANSYS 3 February 1, 2011 23:04
DecomposePar unequal number of shared faces maka OpenFOAM Pre-Processing 6 August 12, 2010 10:01
choosing faces in CFX with imported WB mesh mactech001 CFX 1 December 7, 2009 03:30
cfx mesh problem... mactech001 ANSYS Meshing & Geometry 0 November 5, 2009 03:19
CFX 5.5 Roued CFX 1 October 2, 2001 17:49


All times are GMT -4. The time now is 06:45.