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

CFX meshing aspect ratio problems

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 12, 2010, 11:35
Default CFX meshing aspect ratio problems
  #1
New Member
 
Akash
Join Date: Nov 2010
Location: Southampton
Posts: 3
Rep Power: 6
akash_morar is on a distinguished road
Trying to mesh a wind tunnel in the CFX mesher and am getting warnings of aspect ratios greater than 50. What are acceptable aspect ratios for the mesh and how would i make it smaller.

Thanks
akash_morar is offline   Reply With Quote

Old   November 13, 2010, 05:35
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,954
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
This is discussed in the CFX documentation, I think under obtaining convergence.
ghorrocks is offline   Reply With Quote

Old   November 13, 2010, 09:49
Default mesh aspect ratio
  #3
New Member
 
Join Date: Oct 2010
Posts: 18
Rep Power: 6
dada1204 is on a distinguished road
the acceptable range of mesh aspect ratio is below 100.
dada1204 is offline   Reply With Quote

Old   November 13, 2010, 23:41
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,954
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
The actual number depends on the flow you are simulating and where the element is in the flow. 100:1 is OK for single phase in the boundary layer adjacent to a wall where the flow is aligned with the element, but even 2:1 is not good enough for accurate surface tension models. I find sweeping statements like this useless.

Really you need to do a sensitivity study on it for your application. But if you describe the application we might be able to give you some tips based on our experience.
ghorrocks is offline   Reply With Quote

Reply

Tags
ansys 12.1, aspect ratio, cfx, meshing

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
is free meshing or mapped meshing is best for flow problems shanu Main CFD Forum 0 February 18, 2010 12:58
is free meshing or mapped meshing is best for flow problems shanu OpenFOAM Meshing & Mesh Conversion 0 February 18, 2010 12:56
Problem with meshing long, thin faces in CFX Martin CFX 3 January 8, 2009 21:51
Aspect ratio Tetra Newbie CFX 1 May 18, 2006 18:46
aspect ratio ditto CFX 7 May 11, 2003 11:19


All times are GMT -4. The time now is 16:12.