[s.m]

Hi Foamers,
i have a queation that may seems to you very simple!
what is the number infront of divergence or laplacian scheme in fvSchme?
e.g "1.0" in div(phi,U) bounded Gauss GammaV "1.0"
or "0.7" in laplacian(nuEff,U) Gauss linear limited "0.7";
what is them, and what is the effect of the decreasing or increasing them on our analysis?

Thankyou

[s.m]

any guidance?

[wyldckat]

Greetings s.m,

Quick question: Have you checked the OpenFOAM User Guide? Namely the section 4.4 Numerical schemes?

There is also the Programmer's Guide, where you can find additional information. The following page provides information on where to find it and includes some corrections to this guide: http://openfoamwiki.net/index.php/Op...s_Guide_Errata

Best regards,
Bruno

[s.m]

Originally Posted by wyldckat

Greetings s.m,

Quick question: Have you checked the OpenFOAM User Guide? Namely the section 4.4 Numerical schemes?

There is also the Programmer's Guide, where you can find additional information. The following page provides information on where to find it and includes some corrections to this guide: http://openfoamwiki.net/index.php/Op...s_Guide_Errata

Best regards,
Bruno

Hi
yes, but i can't understand the role of the number 1.0 or 0.33 or 0.7 that is written in front of the scheme!

[wyldckat]

If I'm not mistaken, it's the values explained in section "4.4.2 Surface normal gradient schemes".

I forgot to mention this reference wiki page as well: http://openfoamwiki.net/index.php/OpenFOAM_guide - be sure to read the pages therein.

Sorry that I don't have a clear answer for you, but this is just to help you find some more sources of information, until someone who knows the answer can write about it Because I don't know the exact answer you're looking for.

And I do have the feeling that this has already been on the forum already...

Good luck!
Bruno

[Tobi]

In the numerical schemes with limiter its the functionallity of it like:

1 = limiter function to 100%
0.33 = limiter function to 33 %
0 = limiter function 0 %

therefor the scheme

Gauss limitedLinear 0

should be the same as

Gauss linear

I think in the laplacian scheme its something like this, isn't it?

[s.m]

Originally Posted by Tobi

In the numerical schemes with limiter its the functionallity of it like:

1 = limiter function to 100%
0.33 = limiter function to 33 %
0 = limiter function 0 %

therefor the scheme

Gauss limitedLinear 0

should be the same as

Gauss linear

I think in the laplacian scheme its something like this, isn't it?

Thank you Tobi,
in laplacian scheme is "Gauss linear limited 1.0"
what is this limiters do when we set the laplacian scheme set to use them?
in oder words, is it better to use Gauss linear that doen't use any limiters or it is good to use limiters, why?
Thank you for your guidance.