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

Challenge of differencing scheme choice

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 28, 2003, 05:01
Default Challenge of differencing scheme choice
  #1
Julie Polyakh
Guest
 
Posts: n/a
Calculation with UD differencing scheme yields results that are closer to the experimentally measured velocity profile. However, with MARS scheme the curve behavior is very similar to the one of experimental data. Which scheme would you choose?
  Reply With Quote

Old   July 28, 2003, 08:38
Default Re: Challenge of differencing scheme choice
  #2
Ossi
Guest
 
Posts: n/a
Basically, one should not use UD for computations. However, sometimes it is the only choice due to bad convergence. But generally speaking, stick to MARS or other second order scheme !
  Reply With Quote

Old   July 30, 2003, 11:12
Default Re: Challenge of differencing scheme choice
  #3
cjtune
Guest
 
Posts: n/a
If your flow doesn't have sharp gradients or the only mesh you can afford is a coarse one, then it's UD. If you wish to dampen out oscillating effects (ie. simulate a transient phenomena as steady state to just get 'bulk' values -with 2nd orders will not converge), then that's another reason to use UD. But don't expect anything other than 'in-the-ballpark' figures for your results.
  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
Differencing Scheme MARS michael OpenFOAM Running, Solving & CFD 1 August 10, 2006 10:51
differencing scheme....help P.kalyanakumar CD-adapco 1 July 27, 2005 22:54
MARS differencing scheme Bart CD-adapco 4 January 27, 2005 10:43
Central differencing scheme alice FLUENT 1 March 11, 2004 20:07
Differencing scheme for k-eps model Ron Barer Main CFD Forum 14 November 2, 2000 01:02


All times are GMT -4. The time now is 18:47.