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Lack of understanding? Spatial OF Schemes

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Old   April 15, 2014, 09:38
Default Lack of understanding? Spatial OF Schemes
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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               ;
}
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Old   April 30, 2014, 07:15
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no one can comment on that?
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