[Cleyton]

Hi!

I'm trying understand the discretization schemes in the fvSchemes and I have a doubt :

If for each discretization scheme (grad, div and laplacian) we already set the interporlation schemes, for exemple "Gauss Linear". So, why do I need to fill the interpolationSchemes subdictionary?

gradSchemes
{
default Gauss linear;
grad(p) Gauss linear;
}

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

laplacianSchemes
{
default Gauss linear orthogonal;
}

interpolationSchemes
{
default linear;

Regards,

Cleyton

[Cleyton]

I’m sorry, I dont’ know if my question is clear. I’m new in openFoam
Let me try again…
When I set for example the divSchemes like Gauss linear it means that the spatial discretization will follow Gauss theorem, where appears face fluxes and then I have to set the interpolation scheme for the fluxes, in this case linear (central differences). (please let me know if I’m wrong in my thinking)
I don’t understand why I have to set the interpolationSchemes sub-dictionary if I already do it for each term (div, grad and laplacian). Where OpenFoam use that information?
Thanks for your help

[clapointe]

Check out the interpolation section here : https://cfd.direct/openfoam/user-guide/v6-fvschemes/. So the interpolation schemes are for interpolating to faces only -- likely using something like fvc::interpolate -- to compute/update a surfaceScalarField/surfaceVectorField.

Caelan

[Cleyton]

Thanks for reply Caelan

[Cleyton]

I found what I'm looking for in this thread Basic Questions about fvSchemes file

interpolationSchemes gives the way on how the flux (phi) is calculated.

[H...G]

Dear foamers

Is there any interpolation Scheme that set the value at the surface just equal to that on the same cell center.

For lapalacian term, I do not want to set the conductivity value as the average of two adjacent cell. i need it axactly equal to the value at the same cell center.

best,

Hoss