CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Numerical diffusion between TVD and NVD schemes

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 21, 2016, 08:14
Default Numerical diffusion between TVD and NVD schemes
  #1
New Member
 
Wenkun Zhao
Join Date: Mar 2015
Location: Nanjing, China
Posts: 14
Rep Power: 3
Eric Brant is on a distinguished road
Hi all formers,

I recently calculated a compressible flow using rhoCentralFoam and I found quite difference between the results when using different interpolationSchemes in fvSchemes file.
The default interpolationSchemes for "reconstruct()" is VanLeer(V):
Code:
interpolationSchemes
{
    default                linear;
    reconstruct(rho)    vanLeer;
    reconstruct(U)      vanLeerV;
    reconstruct(T)      vanLeer;
}
I found the result is sort of over dissipation, but when I use Gamma
Code:
interpolationSchemes
{
    default                linear;
    reconstruct(rho)    Gamma    0.2;
    reconstruct(U)      GammaV  0.2;
    reconstruct(T)      Gamma    0.2;
}
the results are better. I don't know why they are different since they are all second order schemes. It means that VanLeer is more numerical diffusive?
Any suggestions?
Eric Brant 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
Nvd / tvd MichiB OpenFOAM Programming & Development 5 November 5, 2015 09:18
Need modification for MUSLE or MC schemes liuhuafei OpenFOAM Bugs 3 June 13, 2010 02:38
TVD ... Questioner Main CFD Forum 1 June 7, 2006 08:54


All times are GMT -4. The time now is 05:54.