[jmf]

Hello dear all

Situation of a novice : I fail in using yPlusRAS
After running simpleFoam, yPLusRAS returns following message :
"Patch 0 named wall y+ : min: 0 max: 0 average: 0"

It creates a yPLus containing :

internalField   uniform 0;
boundaryField
{
    wall
    {
        type            calculated;
        value           uniform 0;
    }
    inlet
    {
        type            calculated;
        value           uniform 0;
    }
    outlet
    {
        type            calculated;
        value           uniform 0;
    }

and a file 'y' with non null values (almost one value per model node), of which the average is 0.38

What did I miss ?

Best regards

Jean-Michel

[lakeat]

Since yPlus is calculated by

    if (isType<wallFvPatch>(curPatch))
    {
        Yp = pow(Cmu, 0.25)
            *y_[patchNo]
            *sqrt(k()().boundaryField()[patchNo].patchInternalField())
            /nu().boundaryField()[patchNo];
    }

in file RASModel.C

So, I am bold to guess something wrong with the k field, eg. you are missing it?

[jmf]

Hi Daniel

My k dictionary contains:

 inlet
    {
        type            fixedValue;
        value           uniform 3 ;
    }
    outlet
    {
        type            zeroGradient;
    }
    wall
    {
        type            kqRWallFunction;
        value           uniform 5;
    }

and Cmu = 0.09

Is following message from solver normal :
"smoothSolver: Solving for nuTilda, Initial residual = 0, Final residual = 0, No Iterations 0" ?

Thanks for your help
J-Michel

[tian]

Hi,

maybe you have to set the boundary patch to "wall"?

Byt
Thomas

[jmf]

Hi Thomas

The boundary patches are set to "wall"

Thanks to everybody for the time

J-Michel