[SPH_CFD]

Dear all

I am running a case using cavitatingFoam. However, I have a problem when I want to check yPlus. It is always "command not found". Do you know some ways to get this value?
Thank you in advance.

[Lorena2fdez]

Originally Posted by SPH_CFD

Dear all

I am running a case using cavitatingFoam. However, I have a problem when I want to check yPlus. It is always "command not found". Do you know some ways to get this value?
Thank you in advance.

You need to use the comands "yPlusRAS" or "yPlusLES". Use "yPlusRAS --help" for their options. Look at simulationType in turbulenceProperties for know which use.

Best regards,
Lorena

[SPH_CFD]

Originally Posted by Lorena2fdez

You need to use the comands "yPlusRAS" or "yPlusLES". Use "yPlusRAS --help" for their options. Look at simulationType in turbulenceProperties for know which use.

Best regards,
Lorena

Thank you for your answer. However, I cannot perform that command and get "command not found". I do not know that yPlusRas is possible for mixture model in OF or not?
I see here for openFOAM 1.5. They say that yPlusRAS only exist for singlephase.
http://www.cfd-online.com/Forums/ope...-yplusras.html

Is it true?

[Lorena2fdez]

Originally Posted by SPH_CFD

Thank you for your answer. However, I cannot perform that command and get "command not found". I do not know that yPlusRas is possible for mixture model in OF or not?
I see here for openFOAM 1.5. They say that yPlusRAS only exist for singlephase.
http://www.cfd-online.com/Forums/ope...-yplusras.html

Is it true?

If you loaded correctly OpenFOAM your wouldn't have the problem "command not found". I use OpenFOAM-2.3.0 and the comand "yPlusRAS" is recognized.

Generally there's a problem with the function yPlusRAS. It say that don't read the value of nu. You need to change the constant/transportProperties and write in the initial lines the value of nu. Remember restart the file for run the case. For the tutorial example of cavitatingFoam:

/*--------------------------------*- 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      transportProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

mul             mul [ 1 -1 -1 0 0 ] 0.0065;

muv             muv [ 1 -1 -1 0 0 ] 5.953e-06;

## Only for yPlusRAS ##
    transportModel  Newtonian;
    nu              nu [ 0 2 -1 0 0 0 0 ] 7.831e-06;
## Only for yPlusRAS ##

phases (vapour water);

water
{
    transportModel  Newtonian;
    nu              nu [ 0 2 -1 0 0 0 0 ] 7.831e-06;
    rho             rho [ 1 -3 0 0 0 0 0 ] 830;
    CrossPowerLawCoeffs
    {
        nu0             nu0 [ 0 2 -1 0 0 0 0 ] -999;
        nuInf           nuInf [ 0 2 -1 0 0 0 0 ] -999;
        m               m [ 0 0 1 0 0 0 0 ] -999;
        n               n [ 0 0 0 0 0 0 0 ] -999;
    }

    BirdCarreauCoeffs
    {
        nu0             nu0 [ 0 2 -1 0 0 0 0 ] -999;
        nuInf           nuInf [ 0 2 -1 0 0 0 0 ] -999;
        k               k [ 0 0 1 0 0 0 0 ] -999;
        n               n [ 0 0 0 0 0 0 0 ] -999;
    }
}

vapour
{
    transportModel  Newtonian;
    nu              nu [ 0 2 -1 0 0 0 0 ] 4.252e-05;
    rho             rho [ 1 -3 0 0 0 0 0 ] 0.14;
    CrossPowerLawCoeffs
    {
        nu0             nu0 [ 0 2 -1 0 0 0 0 ] -999;
        nuInf           nuInf [ 0 2 -1 0 0 0 0 ] -999;
        m               m [ 0 0 1 0 0 0 0 ] -999;
        n               n [ 0 0 0 0 0 0 0 ] -999;
    }

    BirdCarreauCoeffs
    {
        nu0             nu0 [ 0 2 -1 0 0 0 0 ] -999;
        nuInf           nuInf [ 0 2 -1 0 0 0 0 ] -999;
        k               k [ 0 0 1 0 0 0 0 ] -999;
        n               n [ 0 0 0 0 0 0 0 ] -999;
    }
}


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

The idea of the problem of yPlusRAS is like the function don't read transportProperties after "phases (vapour water);" and it doesn't get the respective values.

Best regards,
Lorena

[SPH_CFD]

Originally Posted by Lorena2fdez

If you loaded correctly OpenFOAM your wouldn't have the problem "command not found". I use OpenFOAM-2.3.0 and the comand "yPlusRAS" is recognized.

Generally there's a problem with the function yPlusRAS. It say that don't read the value of nu. You need to change the constant/transportProperties and write in the initial lines the value of nu. Remember restart the file for run the case. For the tutorial example of cavitatingFoam:

/*--------------------------------*- 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      transportProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

mul             mul [ 1 -1 -1 0 0 ] 0.0065;

muv             muv [ 1 -1 -1 0 0 ] 5.953e-06;

## Only for yPlusRAS ##
    transportModel  Newtonian;
    nu              nu [ 0 2 -1 0 0 0 0 ] 7.831e-06;
## Only for yPlusRAS ##

phases (vapour water);

water
{
    transportModel  Newtonian;
    nu              nu [ 0 2 -1 0 0 0 0 ] 7.831e-06;
    rho             rho [ 1 -3 0 0 0 0 0 ] 830;
    CrossPowerLawCoeffs
    {
        nu0             nu0 [ 0 2 -1 0 0 0 0 ] -999;
        nuInf           nuInf [ 0 2 -1 0 0 0 0 ] -999;
        m               m [ 0 0 1 0 0 0 0 ] -999;
        n               n [ 0 0 0 0 0 0 0 ] -999;
    }

    BirdCarreauCoeffs
    {
        nu0             nu0 [ 0 2 -1 0 0 0 0 ] -999;
        nuInf           nuInf [ 0 2 -1 0 0 0 0 ] -999;
        k               k [ 0 0 1 0 0 0 0 ] -999;
        n               n [ 0 0 0 0 0 0 0 ] -999;
    }
}

vapour
{
    transportModel  Newtonian;
    nu              nu [ 0 2 -1 0 0 0 0 ] 4.252e-05;
    rho             rho [ 1 -3 0 0 0 0 0 ] 0.14;
    CrossPowerLawCoeffs
    {
        nu0             nu0 [ 0 2 -1 0 0 0 0 ] -999;
        nuInf           nuInf [ 0 2 -1 0 0 0 0 ] -999;
        m               m [ 0 0 1 0 0 0 0 ] -999;
        n               n [ 0 0 0 0 0 0 0 ] -999;
    }

    BirdCarreauCoeffs
    {
        nu0             nu0 [ 0 2 -1 0 0 0 0 ] -999;
        nuInf           nuInf [ 0 2 -1 0 0 0 0 ] -999;
        k               k [ 0 0 1 0 0 0 0 ] -999;
        n               n [ 0 0 0 0 0 0 0 ] -999;
    }
}


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

The idea of the problem of yPlusRAS is like the function don't read transportProperties after "phases (vapour water);" and it doesn't get the respective values.

Best regards,
Lorena

Hi Lorena. Thank you so much !!! it works !!!