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

Meshing

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 18, 2010, 20:15
Default Meshing
  #1
New Member
 
Oliver Griffiths
Join Date: Mar 2010
Posts: 2
Rep Power: 0
griff02 is on a distinguished road
Hi
I am trying to describe why distorted elements give bad results in FEA and CFD programs for my final year project and cannot find an explanation anywhere. Can anyone help???
Thanks
Oli
griff02 is offline   Reply With Quote

Old   March 20, 2010, 13:57
Default
  #2
Senior Member
 
John Chawner
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 208
Rep Power: 8
jchawner is on a distinguished road
Oliver:

Here's a place to start: distortion may reduce numerical accuracy because numerical approximations are no longer centered (or symmetric) about the centroid of the volume element. (from http://www.flow3d.com/cfd101/cfd101_grid.html)
__________________
John Chawner / jrc@pointwise.com / www.pointwise.com
Blog: http://blog.pointwise.com/
on Twitter: @jchawner
jchawner is offline   Reply With Quote

Old   March 20, 2010, 14:25
Default
  #3
Senior Member
 
Ahmed
Join Date: Mar 2009
Location: NY
Posts: 241
Rep Power: 8
Ahmed is on a distinguished road
no matter what discretisation scheme is used, you end up with a matrix that has to be solved.
see what causes the solution of a matrix difficult/inaccurate then trace it back to the distorted mesh elements
Ahmed is offline   Reply With Quote

Old   March 22, 2010, 08:30
Default
  #4
Senior Member
 
Julien de Charentenay
Join Date: Jun 2009
Location: Australia
Posts: 228
Rep Power: 8
julien.decharentenay is on a distinguished road
Send a message via Skype™ to julien.decharentenay
You may be interesting in reading through http://powerlab.fsb.hr/ped/kturbo/Op...jeJasakPhD.pdf

The section on discretisation contains a discussion on orthogonality and others things to pay attention to in the meshing process.
julien.decharentenay is offline   Reply With Quote

Old   March 23, 2010, 08:06
Default
  #5
New Member
 
Oliver Griffiths
Join Date: Mar 2010
Posts: 2
Rep Power: 0
griff02 is on a distinguished road
Thanks guys, this is really helpful
griff02 is offline   Reply With Quote

Reply

Tags
cfd, fea, mesh, 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
Best Meshing scheme for Cylinder Nutrex Main CFD Forum 4 July 29, 2008 11:03
ICEM Meshing Jaloha CFX 0 April 1, 2008 06:24
Meshing locks workbench window. andy2o CFX 0 February 1, 2008 05:01
Singularity of grid?Volume meshing vs face meshing Ken Main CFD Forum 0 September 4, 2003 11:09
Volume Meshing & Face Meshing? singularity of grid ken FLUENT 0 September 4, 2003 11:08


All times are GMT -4. The time now is 08:22.