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nut file of OpenFoam

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Old   July 16, 2022, 14:37
Default nut file of OpenFoam
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Silver Blaze
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Dear Altruist,

I am trying to solve a turbulence model by using Spalart-Allmaras turbulence model. my Re = 2.98X10^6, nu = 0.001002991, rho = 997 kg/m^3, Speed = 3 m/s. Now my question is,

what are nut and nuTilda file? I have searched on google, but don't get it.

and

according my value of rho, nu, v etc. my nut and nuTilda file will update?

my nut file :
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      nut;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 2 -1 0 0 0 0];

internalField   uniform 0.14;

boundaryField
{
    inlet
    {
        type            freestream;
        freestreamValue uniform 0.14;
    }

    outlet
    {
        type            freestream;
        freestreamValue uniform 0.14;
    }

    hydrofoil-wall
    {
        type            nutUSpaldingWallFunction;
        value           uniform 0;
    }

    frontAndBack
    {
        type            empty;
    }
}
my nuTilda code:
Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      nuTilda;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 2 -1 0 0 0 0];

internalField   uniform 0.14;

boundaryField
{
    inlet
    {
        type            freestream;
        freestreamValue uniform 0.14;
    }

    outlet
    {
        type            freestream;
        freestreamValue uniform 0.14;
    }

    hydrofoil-wall
    {
        type            fixedValue;
        value           uniform 0;
    }

    frontAndBack
    {
        type            empty;
    }
}
and what is uniform 0.14 value?

Kindly help me. I am new in OpenFoam (openFoam.com)

Last edited by silver.blaze; July 16, 2022 at 14:41. Reason: add question
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Old   July 22, 2022, 15:12
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abdikerim kurbanaliev
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You can find useful info on the cfd.online forum.

how to set nut and nuTilda?
nut and nuTilda in simpleFoam
nut and nuTilda
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Old   July 22, 2022, 15:16
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abdikerim kurbanaliev
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You have boundary condition files for the two quantities nut and nuTilda.
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Old   July 22, 2022, 15:18
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Quote:
Originally Posted by kerim View Post
You have boundary condition files for the two quantities nut and nuTilda.
Thanks for your reply. My updated problem is here: Hydrofoil in Openfoam
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