[Mirage]

Dear Foamers,

I am running a LES Simulation in OF 3.0.1 and unfortunately I am not getting any output file for nuSgs.

The declaration of LES and turbulence model in OF 3.0.1 was changed comparing with older version. I declared my LES properties in the turbulenceProperties as following:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.3.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      turbulenceProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

simulationType  LES;
LES
{

LESModel        Smagorinsky;

turbulence      on;

printCoeffs     on;

delta           vanDriest;

printCoeffs     on;

SmagorinskyCoeffs
{
    ce 1.048;
    ck 0.047147; //Cs = 0.1
}

vanDriestCoeffs
{
    delta           cubeRootVol;
    cubeRootVolCoeffs
    {
        deltaCoeff      1;
    }

    smoothCoeffs
    {
        delta           cubeRootVol;
        cubeRootVolCoeffs
        {
            deltaCoeff      1;
        }

        maxDeltaRatio   1.1;
    }

    Aplus           26;
    Cdelta          0.158;
}
}





// ************************************************************************* //

Here is the nuSgs file in 0 folder:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.3.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      nuSgs;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform 0;

boundaryField
{
    inlet_cyclic
    {
        type            cyclic;
    }

    outlet_cyclic
    {
        type            cyclic;
    }

    heatedWall
    {
        type            zeroGradient;
    }

    topWall
    {
        type            zeroGradient;
    }
  
     back1a
     {
        type            cyclic;
     }

     front1a
     {
        type            cyclic;
     }

     back1b
     {
        type            cyclic;
     }

     front1b
     {
        type            cyclic;
     }

     back1c
     {
        type            cyclic;
     }

     front1c
     {
        type            cyclic;
     }

     back2a
     {
        type            cyclic;
     }

     front2a
     {
        type            cyclic;
     }

     back2b
     {
         type            cyclic;
     }

     front2b
     {
        type            cyclic;
     }

     back2c
     {
        type            cyclic;
     }

     front2c
     {
        type            cyclic;
     }

     back3a
     {
        type            cyclic;
     }

     front3a
     {
        type            cyclic;
     }

     back3b
     {
        type            cyclic;
     }

     front3b
     {
        type            cyclic;
     }

     back3c
     {
         type            cyclic;
     }

     front3c
     {
        type            cyclic;
     }

     back3d
     {
        type            cyclic;
     }

     front3d
     {
        type            cyclic;
     }

     back3e
     {
        type            cyclic;
     }

     front3e
     {
        type            cyclic;
     }

     back4
     {
        type            cyclic;
     }

     front4
     {
        type            cyclic;
     }

}

// ************************************************************************* //

I was wondering, why i do not have any nuSgs file and if this could effect my result quality.

Do you think, that the LES declaration is correct?

How can I fix the problem?

Thank you in advance for your help

[Atzori]

Hi!

I guess in OpenFOAM 3.0 nu_sgs has been substituted by nut.
Please check by yourself: I had a look at the initial conditions in the tutorial:

https://github.com/OpenFOAM/OpenFOAM...otorBike/0.org

And I tried to compare the Smagorinsky model in the different versions:

https://github.com/OpenFOAM/OpenFOAM.../Smagorinsky.C

https://github.com/OpenFOAM/OpenFOAM.../Smagorinsky.C

Cheers!!
Marco