CFD Online Discussion Forums - Access to ck or ce of the Smagorinsky in a new solver

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Access to ck or ce of the Smagorinsky in a new solver

Dear Foamer,

I am trying to set different values of ck or ce of Smagorinsky model in different regions of the domain. I am not sure whether it is possible to access to ck in the main code of a new solver. Does anyone have an idea?

My best regards,
Jian

Greetings Jian,

Quick question: do you mean you want to access the values for the turbulence model in general or the one on a specific patch?

I ask this because I honestly haven't checked which Smagorinsky model you're referring to...

Best regards,
Bruno

Hi Bruno,

I mean the incompressible::turbulence::LES models::Smagorinsky. Just like using setFields for 'alpha'. I want to select a region (BoxtoCell) and specify a set value of ck/ce. The remaining region are set to another set of value. I am not sure whether it is possible.

My best regards,
Jian

Hi Jian,

From what I can see in the source code:

Both "ce_" and "ck_" are simple scalars and not scalar fields. Which means that as the code is currently defined, it's uniform on all of the domain.

You will have to create a variant of those two classes for them to use "ce" and/or "ck" as scalar fields. Only then will you be able to set values specific to certain locations of the mesh.

Have a look into the code "src/turbulenceModels/compressible/LES/SpalartAllmaras": https://github.com/OpenFOAM/OpenFOAM...palartAllmaras - it uses scalar fields for these variables:

Quote:

Code:

        volScalarField nuTilda_;

        volScalarField dTilda_;

        volScalarField muSgs_;

        volScalarField alphaSgs_;

Best regards,
Bruno