CFD Online Discussion Forums - nut file of OpenFoam

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)