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

mesh quality tolerance

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 25, 2008, 14:27
Default mesh quality tolerance
  #1
nick
Guest
 
Posts: n/a
Hi

Iam new to cfd and trying to simulate the pressure recovery coefficient through a conical diffuser. Using the SST turbulence model, I am wondering what kind of mesh quality tolerance this model (and others) typically have in obtaining reasonably good results. Is a mesh quality (as evaluated using ICEM) of 0.3 generally too low
  Reply With Quote

Old   March 25, 2008, 17:27
Default Re: mesh quality tolerance
  #2
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

This is strongly problem dependant. If it is a simple flow without separation a coarse low quality mesh might be OK, but if you have separations that will raise the bar and iff you have swirl (therefore likely requiring RSM turbulence models) then that raises the bar even further.

Time spent improving mesh quality is never wasted.

An ICEM mesh quality of 0.3 is OK for most situations, but that may not work for RSM models if that is required.

Glenn Horrocks
  Reply With Quote

Old   March 25, 2008, 18:40
Default Re: mesh quality tolerance
  #3
Steven
Guest
 
Posts: n/a
Glenn, can you check mesh quality anywhere in CFX mesher? Ive been using that for my tet meshs and wondered if you might know?

Thanks

Steve
  Reply With Quote

Old   March 26, 2008, 17:28
Default Re: mesh quality tolerance
  #4
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

If you mean CFX-Mesh in workbench - no you cannot check mesh quality (other than visually viewing it and that is a pretty good check if you know what you are looking for).

The way to check a mesh is to load it into CFX-Post and calculate the mesh statistics and quality parameters.

Glenn Horrocks
  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
3D Hybrid Mesh Errors DarrenC ANSYS Meshing & Geometry 11 August 5, 2013 06:42
[ICEM] Generating Mesh for STL Car in Windtunnel Simulation tommymoose ANSYS Meshing & Geometry 48 April 15, 2013 04:24
General mesh quality criteria daniel.struwig NUMECA 1 June 10, 2011 02:52
fluent add additional zones for the mesh file SSL FLUENT 2 January 26, 2008 12:55
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 18:10


All times are GMT -4. The time now is 09:39.