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

Upwind scheme

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 25, 2007, 18:45
Default Upwind scheme
  #1
KM
Guest
 
Posts: n/a
Hi there,

I know that upwind scheme should only be used for the initial guess but not for the final results. Can we believe on results from upwind upto an extent, to do some analysis if our model physics is working fine ? Or these results are not good for any kind of analysis ?

Regards, KM.
  Reply With Quote

Old   September 25, 2007, 23:21
Default Re: Upwind scheme
  #2
Glenn Horrocks
Guest
 
Posts: n/a
Hi,

Problem dependant, so cannot give a general answer. Do a run using both and compare for your application.

Glenn Horrocks
  Reply With Quote

Old   September 26, 2007, 11:10
Default Re: Upwind scheme
  #3
CycLone
Guest
 
Posts: n/a
Hi KM,

All CFD analysis includes some degree of error. Running with a first order upwind advection scheme simply means that the error is going to be larger for a given grid resolution and therefore will require a much finer mesh to minimize this error.

An easy way to estimate the magnitude of this error is to compare results using upwind to High Resolution or a Specified Blend Factor. You'll find that the difference is largest on a coarse mesh and is reduced as you refine the mesh.

-CycLone
  Reply With Quote

Old   September 27, 2007, 14:41
Default Re: Upwind scheme
  #4
Kushagra Mittal
Guest
 
Posts: n/a
Thanks a ton ! It helps.

Regards, Kushagra.
  Reply With Quote

Old   September 27, 2007, 14:41
Default Thanks: Upwind scheme
  #5
Kushagra Mittal
Guest
 
Posts: n/a
Thanks a ton ! It helps.

Regards, Kushagra.
  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
2nd order upwind vs 2nd order upwind!!! Far Main CFD Forum 7 March 14, 2013 13:29
Use of upwind scheme for interpolation of u/v quarkz Main CFD Forum 6 August 30, 2011 04:10
Second order upwind is not UPwind!!! Far CFX 9 May 31, 2011 08:21
2nd order upwind scheme (Fluent and CFX) Far FLUENT 0 May 22, 2011 01:50
Drag comparison upwind vs. scheme Luk_Fiz CFX 3 April 27, 2009 21:42


All times are GMT -4. The time now is 07:00.