interpolationSchemes
 

Hi!

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

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? :confused:

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

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

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

Thanks for reply Caelan:)

I found what I'm looking for in this thread https://www.cfd-online.com/Forums/op...emes-file.html

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

Interpolation Scheme
 

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