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

ICEM, holes in swept surface mesh

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 12, 2006, 14:08
Default ICEM, holes in swept surface mesh
  #1
Roland
Guest
 
Posts: n/a
Hi

Im new to using ICEM, but was using a known-good model from Ansys (that is, meshed well in CFX Mesh). In my application, I have an air intake scoop on the hood of an automobile which is 5mm thick. The scoop was created as a simple loft, and opposing surfaces are not intersecting. For whatever reason, ICEM is leaving several large holes in this scoop, where CFX Mesh does not. I have tried changing tet size, natural size, and a few other things thinking that this was a resolution problem. But, the holes remain while the tet count skyrockets. Is there some functionality I need to use to identify thin surfaces in ICEM, or some other configuration option needed? I believe the geometry is clean...

If it matters for visualization, the test model is a Subaru WRX, with the fairly pronounced hood scoop.

Regards, Roland
  Reply With Quote

Old   September 12, 2006, 14:15
Default Re: ICEM, holes in swept surface mesh
  #2
Joe
Guest
 
Posts: n/a
Holes are useually caused by:

-Poor surface geometry. -Improper setting of various mesh related tolerances e.g. surface import tolerance. -Improper/Non-use use of Repair geometry > Build diagnostic topology.

  Reply With Quote

Old   September 12, 2006, 17:23
Default Re: ICEM, holes in swept surface mesh
  #3
Roland
Guest
 
Posts: n/a
Thanks Joe- I will have a look at the tolerances. From what I can tell via various views, the thickness on this scoop is as it should be (and as was handled properly in CFX Mesh). I did leverage the Repair Geometry function post import, but perhaps there are some additional options there I need to consider.

Best, Roland
  Reply With Quote

Old   September 13, 2006, 08:33
Default Re: ICEM, holes in swept surface mesh
  #4
myron
Guest
 
Posts: n/a
For ICEM - the cleanest way is always to remove unnecessary surfaces. If you previously used CFX mesh, I'm assuming you're meshing for the fluid region - not the solid. So I would keep only the geometry that represents the boundary of the fluid region - deleting the opposite surfaces of the scoop (that are actually bounding what would be the solid volume). That often clears up these types of problems. You can also create thin cuts (Tetra Meshing Parameters) or in the Natural Size settings - ignore wall thickness.
  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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
How to mesh a swept wing in ICEM? kepeng ANSYS Meshing & Geometry 0 April 24, 2010 12:34
external flow with snappyHexMesh chelvistero OpenFOAM 11 January 15, 2010 20:43
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
CFX4.3 -build analysis form Chie Min CFX 5 July 12, 2001 23:19


All times are GMT -4. The time now is 23:34.