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

Order of numerical scheme

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 12, 2012, 09:17
Default Order of numerical scheme
  #1
Member
 
Johannes Ringborn
Join Date: Nov 2012
Posts: 40
Rep Power: 4
j_h_86 is on a distinguished road
Hello,

I did a 2nd order calculation of a laminar flow in CFX which followed a GCI study (refinement factor r=2, 3 grids, asymptotic range (1.001113)). I observed a rate of convergence of p=1.15.
I expected a value a bit less than 2 due to numerical effects but can a value close to 1 still be correct?

Thank you very much in advance!
j_h_86 is offline   Reply With Quote

Old   December 12, 2012, 17:26
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,658
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Yes. All the different bits of the equations can converge at different rates - advection could be second order, bit diffusion could be first, etc etc. So if I find I am in the asymptotic range p which is close then I am happy.
ghorrocks is offline   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
Accuracy problem of HO schemes on unstructured mesh, HO scheme gives 1st order result gemini Main CFD Forum 12 December 27, 2011 22:01
TVD scheme limitedLinear only first order accurate? Rickard.Solsjo OpenFOAM 0 July 7, 2011 04:53
Numerical viscosity due to the MUSCL and HLL coulpled scheme sonsiest Main CFD Forum 0 May 23, 2011 15:37
Higher order downwind scheme jelmer OpenFOAM Running, Solving & CFD 4 August 9, 2006 06:43
numerical scheme ado Main CFD Forum 3 October 12, 2000 08:20


All times are GMT -4. The time now is 05:58.