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

Lack of understanding? Spatial OF Schemes

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 15, 2014, 10:38
Default Lack of understanding? Spatial OF Schemes
  #1
Senior Member
 
Join Date: Jan 2014
Posts: 179
Rep Power: 12
hxaxtma is on a distinguished road
Hi guys,

i just want to ask a simple question, I heard often that OF is 2nd order in spatial and time.

Higher order in time: Possible, implementing Runge-Kutta

Higher order spatial:
If I have a look at the numerical schemes of OpenFoam on this side:
http://openfoam.org/docs/user/fvSchemes.php

For those terms is always a fourth order interpolation scheme existing:
interpolationSchemes
snGradSchemes
gradSchemes Gradient divSchemes Divergence laplacianSchemes Laplacian
This means that the reconstruction of the flux could be done by 4th order polynomials (bounded or unbounded) for all NS Eq Terms .

So this must be 4th order in space, or do I miss something really important?

Thanks to you

In addition to that:
How can I use the fourth order schemes in correct way? I got always the error that the fourth order schemes are unknown
Code:
gradSchemes
{
    default         none;
    grad(p)         Gauss fourth;
}

divSchemes
{
    default         none;
    div(phi,U)      Gauss fourth;        
}

laplacianSchemes
{
    default         none;
    laplacian(nu,U) Gauss fourth;
    laplacian((1|A(U)),p) Gauss fourth;
}

interpolationSchemes
{
    default         none;
    interpolate(HbyA) cubicCorrection;
}

snGradSchemes
{
    default         fourth;
}

fluxRequired
{
    default         no;
    p               ;
}
hxaxtma is offline   Reply With Quote

Old   April 30, 2014, 08:15
Default
  #2
Senior Member
 
Join Date: Jan 2014
Posts: 179
Rep Power: 12
hxaxtma is on a distinguished road
no one can comment on that?
hxaxtma is offline   Reply With Quote

Reply


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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Better organization of Convective Term approximation schemes Michail CFD-Wiki 0 March 15, 2012 13:56
Comparison of different spatial and temporal discretization schemes harly OpenFOAM Running, Solving & CFD 2 September 24, 2011 13:15
Need modification for MUSLE or MC schemes liuhuafei OpenFOAM Bugs 3 June 13, 2010 03:38
time stepping schemes for compressible DNS/LES shyamdsundar Main CFD Forum 0 January 15, 2010 00:15
Higher-order bounded convection schemes for pure advection with discontinuity Anthony Main CFD Forum 3 June 13, 1999 03:36


All times are GMT -4. The time now is 23:47.