[Khozaei4000]

Hi guys

I am a bit new to OpenFoam, and I have problem to create R file to start simpleFoam simulation with SSG turbulence model. I have searched all forums, but it has not helped me.

My case is a simple pipe including a venturi-tube. Boundary conditions for inlet and outlet are velocity and pressure, respectively.

I finished simulation for my case with RNGkEpsilon model and it is converged well. Now, I intend to use the results of RNGkEpsilon model as initial values to start simulation with SSG model.

I understood that I have to use "simpleFoam –postProcess –func R" to create the missing R file. I did it several times, but it doesn't work. Actually I don't see any error in the terminal, and I guess the file is created properly. However, I couldn't find the file "turbulenceProperties:R" anywhere in my working directory, nor anywhere on my pc!

I would appreciate it if anybody can help me.


Thanks.



turbulenceProperties:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1812                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      turbulenceProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

simulationType RAS;

RAS
{
    RASModel        kEpsilon;

    turbulence      on;

    printCoeffs     on;
}


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

controlDict:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1812                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

application     simpleFoam;

startFrom		latestTime;

stopAt          endTime;

endTime         2000;

deltaT          1;

writeControl    timeStep;

writeInterval   100;

purgeWrite      0;

writeFormat     ascii;

writePrecision  6;

writeCompression off;

timeFormat      general;

timePrecision   6;

runTimeModifiable true;

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

What I see in the terminal after using "simpleFoam –postProcess –func R" command:

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1812                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : v1812 OPENFOAM=1812
Arch   : "LSB;label=32;scalar=64"
Exec   : simpleFoam -postProcess -func R
Date   : Jun 26 2019
Time   : 03:05:41
Host   : default
PID    : 1141
I/O    : uncollated
Case   : /home/ofuser/workingDir/.........
nProcs : 1
trapFpe: Floating point exception trapping enabled (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 10


SIMPLE: convergence criteria
    field p      tolerance 0.01
    field U      tolerance 0.001
    field "(k|epsilon|omega|f|v2|R)"     tolerance 0.001

turbulenceFields R: storing fields:
    turbulenceProperties:R

Time = 10
Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting turbulence model type RAS
Selecting RAS turbulence model kEpsilon
RAS
{
    RASModel        kEpsilon;
    turbulence      on;
    printCoeffs     on;
    Cmu             0.09;
    C1              1.44;
    C2              1.92;
    C3              0;
    sigmak          1;
    sigmaEps        1.3;
}

No MRF models present

No finite volume options present
    functionObjects::turbulenceFields R writing field: turbulenceProperties:R

End

[Milad_ab]

Dear Mohammad
I have the same problem as you. Have you solved it?
If yes, could you please inform me how can I solve it?
Thank you very much
Milad

[dlahaye]

Possibly below helps
simpleFoam tutorial PitzDaily using Reynolds stress tensor (LRR RASModel)

[Mizar]

I just found that '-postProcess -func R -latestTime' will only calculate R, instead of running the solver while calculating R. Therefore, I ran my solver first to complete the simulation, after that I ran 'mySolver -postProcess -func R -latestTime' to get R.

I previously thought if I added '-postProcess -func R -latestTime', the solver would run and also compute R, so I only executed 'mySolver', but this was actually telling the code to compute R from nothing! That's why it 'END' without any error message.