[Il_Briga]

Hi there!

Apologize for this silly question. A lot of people had the same issue in the past but all the topics i've read did not bring me to any valid solution.

I have to estimate the Reynolds stress tensor from a KomegaSST time variant compressible simulation (rhoPimpleFoam) whose results are saved on my laptot. I'm currently using OpenFOAMv10. Following this guide: https://www.openfoam.com/documentati...nceFields.html i modified my /system/controlDict as follows:

  turbulenceFields1
{
    // Mandatory entries (unmodifiable)
    type            turbulenceFields;
    libs            (fieldFunctionObjects);

    // Mandatory entries (runtime modifiable)
    // Either field or fields entries
    fields          (R devRhoReff);
    field           R;
}

Then i launched the command:

rhoPimpleFoam -postProcess -func turbulenceFields

The postProcessing utility seemed to work, but no results are saved, neither in the time-step folders, neither in the 'postProcessing' one. An extract of the log file is here reported:

Time = 0.005s
Reading thermophysical properties

Selecting thermodynamics package 
{
    type            hePsiThermo;
    mixture         pureMixture;
    transport       const;
    thermo          hConst;
    equationOfState perfectGas;
    specie          specie;
    energy          sensibleEnthalpy;
}

Reading field U

Reading/calculating face flux field phi

Creating turbulence model

Selecting turbulence model type RAS
Selecting RAS turbulence model kOmegaSST
Selecting patchDistMethod meshWave
RAS
{
    RASModel        kOmegaSST;
    turbulence      on;
    printCoeffs     on;
    alphaK1         0.85;
    alphaK2         1;
    alphaOmega1     0.5;
    alphaOmega2     0.856;
    gamma1          0.555556;
    gamma2          0.44;
    beta1           0.075;
    beta2           0.0828;
    betaStar        0.09;
    a1              0.31;
    b1              1;
    c1              10;
    F3              false;
}

Creating thermophysical transport model

Selecting thermophysical transport type RAS
Selecting default RAS thermophysical transport model unityLewisEddyDiffusivity
Creating field dpdt

Creating field kinetic energy K

No MRF models present

No fvModels present
No fvConstraints present
turbulenceFields turbulenceFields: no fields requested to be stored

As i said, no values are saved or prompted. Could somebody help?

[Yann]

Hello,

You have several things mixed up. Lets try to clarify.
When you are using this command:

rhoPimpleFoam -postProcess -func turbulenceFields

You are not calling the function defined in your controlDict (which would be turbulenceFields1) but a predefined function defined in $FOAM_ETC/caseDicts/postProcessing.

When using this predefined function, you need to pass the list of fields you want to process as an argument. This is why you are getting this message in your log:

turbulenceFields turbulenceFields: no fields requested to be stored

The proper syntax is:

rhoPimpleFoam -postProcess -func "turbulenceFields(R devRhoReff)"

If you want to run the functions defined in your controlDict file intead of the predefined functions, you should use this:

rhoPimpleFoam -postProcess

Now, the second thing mixed-up: you are using the documentation from the OpenCFD branch (openfoam.com) while you are using OpenFOAM-10 which is the foundation branch (openfoam.org). So your function in controlDict is not properly defined for OpenFOAM-10. Have a look at the documentation corresponding to your version: https://github.com/OpenFOAM/OpenFOAM...ulenceFields.H

I hope this helps,
Yann

[Il_Briga]

Hi Yann,

Apologize for my late reply. I have been very busy lately. I hope i'm not doing necroposting.

Thank you so much for your reply. Yeap, you gave me a precious hand to clarify several concepts. One last question then i close the topic: in your opinion is better to recover the R stress tensor starting from a K-epsilon or a K-omega simulation (same mesh, same BC, etc..)? Should it be the same?

Thank you very much.