CFD Online Discussion Forums - How to use DESModelRegions function object

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- - How to use DESModelRegions function object (https://www.cfd-online.com/Forums/openfoam-solving/117083-how-use-desmodelregions-function-object.html)

hakonbar

May 1, 2013 18:37

How to use DESModelRegions function object

Hi! I'm doing some DES simulations, and I would like to see which parts of my flow field are in RANS mode and which are in LES mode. I see the new OF release (2.2.0) introduced a new function object called DESModelRegions, which outputs this data. The thing is, I don't know which lines to put in the controlDict in order to activate this object, and which library to load.

Have any of you used this function object before, and do you know which libs to load etc?

best regards,
Håkon Line

wyldckat

May 2, 2013 08:48

Greetings Håkon,

Without an example case, I can't test any further than the following instructions:

Edit the file "system/controlDict".
Append/add the following block:

Code:

functions { desField { type DESModelRegions; functionObjectLibs ("libutilityFunctionObjects.so"); log true; //region "region0"; enabled on; storeFilter on; timeStart 0.0; timeEnd 10.0; outputControl timeStep; outputInterval 5000; } }

Note: it writes and outputs information for each 5000 steps in this example! And if you do not define the "timeStart" and "timeEnd", it will run for the whole simulation.
It created the file "postProcessing/desField/0/DESModelRegions.dat", but I didn't use DES, so I only got this header:

Code:

# DES model region coverage (% volume) # time LES RAS
And since I used "log true;", I only got this message:

Code:

DESModelRegions output: No DES turbulence model found in database
And it creates the field "DES::LESRegion".

Like I wrote at the beginning, without an example, I can't test this properly.

edit: I do have an example case now and is used here: http://www.cfd-online.com/Forums/ope...tml#post424797 - post #10

Best regards,
Bruno

hakonbar

May 3, 2013 08:15

It works perfectly, thanks! Now I've learned the general syntax for function objects as well. =)

potentialFoam

July 5, 2016 07:26

Dear Foamers,

can you help me to use 'DESModelRegions' with OF30X?

I fear, it is not implemented in OF30X. But how could you determine the RANS content of a DES?

Using an older version (like OF231) for postprocessing does not work, 'cos the constant/turbulenceProperties-file changed since this version.

Even this thread

HTML Code:

http://www.cfd-online.com/Forums/openfoam-solving/104123-les-content-detached-eddy-simulation-openfoam.html

does not provide an answer for OF30X.

I would be happy to hear your ideas!
Regards,
Peter

EDIT:
According to a hint I installed OpenFOAM-v1606+ from openfoam.com
and this perfectly works for postprocessing cases simulated with OF301 :-)

Bazinga

December 2, 2016 03:38

Quote:

Originally Posted by potentialFoam (Post 608048)

HTML Code:

http://www.cfd-online.com/Forums/openfoam-solving/104123-les-content-detached-eddy-simulation-openfoam.html

Dear Peter,

I am also trying to find my LES and RANS regions for my DES simulations. Can you guide me how you used 1606+ to find those regions. Thanks

potentialFoam

December 2, 2016 04:01

Sure, inside
system/controlDict.functions
you need to add

Code:

functions

{

 //   Determine LES-content

    desField

    {

      type            DESModelRegions;

      functionObjectLibs ("libutilityFunctionObjects.so");

      log             true;

      enabled on;

      storeFilter on;

      outputControl   outputTime;

    }

}

And afterwards, you can just execute

Code:

execFlowFunctionObjects -time 0.4 | tee log.desField

for the time you want.

Good luck!

Bazinga

December 2, 2016 04:09

Quote:

Originally Posted by potentialFoam (Post 627911)

Sure, inside
system/controlDict.functions
you need to add

Code:

functions

{

 //   Determine LES-content

    desField

    {

      type            DESModelRegions;

      functionObjectLibs ("libutilityFunctionObjects.so");

      log             true;

      enabled on;

      storeFilter on;

      outputControl   outputTime;

    }

}

And afterwards, you can just execute

Code:

execFlowFunctionObjects -time 0.4 | tee log.desField

for the time you want.

Good luck!

Thank you so much for the fast reply. Will try it now. Best regards :)

Bazinga

December 2, 2016 09:39

Hmmm, I installed v1606+ but it says "execFlowFunctionObjects: command not found".

My OpenFOAM 2.4.0 installation can be used for "execFlowFunctionObjects" but for this the folder and file structure has changed too much since, so it doesn't work.

Anything I am missing here?

wyldckat

December 3, 2016 15:18

Quote:

Originally Posted by Bazinga (Post 627970)

Hmmm, I installed v1606+ but it says "execFlowFunctionObjects: command not found".

Quick answer: Something might have went wrong with your installation of v1606+, because execFlowFunctionObjects is built by default in that version as well.

Or maybe you had OpenFOAM 4.0 or 4.1 active in your shell? Because it was replaced by in 4.0 by postProcess, along with (almost) all solvers having their one "-postProcess" argument as well.

Bazinga

December 4, 2016 01:55

Thanks for the quick reply. I think something went wrong with the installation. Will try again :)

edit: So, you were right. Not everything was installed during the 1606+ installation. I was able to run wmake for the execFlowFunctionObjects myself and now it is working :)

hanis_rda

August 14, 2018 06:18

Dear Foamer,

I have done IDDES simulation in OpenFoam 5x.
But when I try to use DESModelRegions function for post-processing in OpenFoam 5x. It is not recognised.
Anyone can help me to find the region that used RANS and LES using OpenFOAM 5x?

Thank you.

wyldckat

August 17, 2018 16:11

Quick answer: https://bugs.openfoam.org/view.php?id=2763

hanis_rda

August 17, 2018 16:25

Quote:

Originally Posted by wyldckat (Post 703033)

Quick answer: https://bugs.openfoam.org/view.php?id=2763

Thank you for the information.
Is there any other function that can differentiate between RANS and LES region?

wyldckat

August 20, 2018 20:45

Greetings hanis_rda,

I was curious about this and was inspired to work on this. I've managed to create the function object for OpenFOAM 5 and 6, but I have not fully tested it.

The repository is provided here: https://github.com/wyldckat/DESModelRegions
And you can find download and build instructions on that page as well.

Please report back here if this works or not and with which OpenFOAM version it worked and with which DES-type turbulence model!

Best regards,
Bruno

hanis_rda

August 21, 2018 09:49

Quote:

Originally Posted by wyldckat (Post 703323)

Thank you very much for your help.
I run for IDDES turbulence model in OpenFOAM5x.
But I got this error message:

Code:



DESModelRegions desField write:

    writing field DES::LESRegion

--> FOAM Warning : 

    From function Foam::OFstream& Foam::functionObjects::logFiles::file()

    in file db/functionObjects/logFiles/logFiles.C at line 131

    Requested single file, but multiple files are present

--------------------------------------------------------------------------

A process has executed an operation involving a call to the

"fork()" system call to create a child process.  Open MPI is currently

operating in a condition that could result in memory corruption or

other system errors; your job may hang, crash, or produce silent

data corruption.  The use of fork() (or system() or other calls that

create child processes) is strongly discouraged.



The process that invoked fork was:



  Local host:          [[16608,0],0] (PID 1396)



If you are *absolutely sure* that your application will successfully

and correctly survive a call to fork(), you may disable this warning

by setting the mpi_warn_on_fork MCA parameter to 0.

--------------------------------------------------------------------------

[0] #0  Foam::error::printStack(Foam::Ostream&) at ??:?

[0] #1  Foam::sigSegv::sigHandler(int) at ??:?

[0] #2  ? in "/usr/lib64/libc.so.6"

[0] #3  Foam::functionObjects::logFiles::file() at ??:?

[0] #4  Foam::functionObjects::DESModelRegions::write() at ??:?

[0] #5  Foam::functionObjects::timeControl::write() at ??:?

[0] #6  Foam::functionObjectList::execute() at ??:?

[0] #7  Foam::Time::loop() at ??:?

[0] #8  ? at ??:?

[0] #9  __libc_start_main in "/usr/lib64/libc.so.6"

[0] #10  ? at ??:?

wyldckat

August 21, 2018 10:18

Quick answer: Sorry about that, I forgot to properly re-test after adapting the missing features that were in the original function object.

I've now fixed it and is available at the repository. To update your build:

If you downloaded by using git, then go into the folder "DESModelRegions" and run:

Code:

git pull wmake wclean
If you downloaded from ZIP, then you must delete the old ZIP file and the folder "DESModelRegions-master". Then do once again the steps for downloading the ZIP file and so on, as instructed on the repository.

hanis_rda

August 21, 2018 10:37

Now it is running for IDDES simulation in OpenFOAM5x. Thank you very much.

# DES model region coverage (% volume)
# Time LES RAS
1.4001 5.134440e+01 4.865560e+01
1.4002 5.134438e+01 4.865562e+01
1.4003 5.134434e+01 4.865566e+01

S123	September 18, 2018 17:27

Receiving error: Attempt to cast type cubeRootVol to type IDDESDelta

Hello, I am trying to run a SpalartAllmarasIDDES simulation in OpenFoam v5.0. However, I receive the error "Attempt to cast type cubeRootVol to type IDDESDelta". Since you were able to successfully run IDDES in v5, please could you provide some assistance. cubeRootVol is the delta notation in my LESProperties file.

This is how my LESProperties file looks:

Code:

simulationType  LES;



LES

{

        LESModel            SpalartAllmarasIDDES;



        delta               cubeRootVol;



        printCoeffs         on;



    turbulence          on;        



        cubeRootVolCoeffs

{

    deltaCoeff      1;

}





laminarCoeffs

{

}



oneEqEddyCoeffs

{

    ck               0.07;

    ce               1.05;

}



dynOneEqEddyCoeffs

{

    ce               1.05;

    filter          simple;

}



locDynOneEqEddyCoeffs

{

    ce               1.05;

    filter          simple;

}



SmagorinskyCoeffs

{

    ce               1.05;

    ck               0.07;

}



Smagorinsky2Coeffs

{

    ce               1.05;

    ck               0.07;

    cD2              0.02;

}



spectEddyViscCoeffs

{

    ce               1.05;

    cB               8.22;

    cK1              0.83;

    cK2              1.03;

    cK3              4.75;

    cK4              2.55;

}



dynSmagorinskyCoeffs

{

    ce               1.05;

    filter          simple;

}



mixedSmagorinskyCoeffs

{

    ce               1.05;

    ck               0.07;

    filter          simple;

}



dynMixedSmagorinskyCoeffs

{

    ce               1.05;

    filter          simple;

}



LRRDiffStressCoeffs

{

    ce               1.05;

    ck               0.09;

    c1               1.8;

    c2               0.6;

}



DeardorffDiffStressCoeffs

{

    ce               1.05;

    ck               0.09;

    cm               4.13;

}



SpalartAllmarasCoeffs

{

    alphaNut         1.5;

    Cb1              0.1355;

    Cb2              0.622;

    Cw2              0.3;

    Cw3              2;

    Cv1              7.1;

    Cv2              5.0;

    CDES             0.65;

    ck               0.07;

}



SpalartAllmarasDDESCoeffs

{

    alphaNut         1.5;

    Cb1              0.1355;

    Cb2              0.622;

    Cw2              0.3;

    Cw3              2.0;

    Cv1              7.1;

    Cv2              5.0;

    CDES             0.65;

    ck               0.07;

}



SpalartAllmarasIDDESCoeffs

{

     delta  IDDESDelta;



     IDDESDeltaCoeffs

     {

         deltaCoeff       1;



         //according to src/turbulenceModels/incompressible/LES/SpalartAllmarasIDDES/IDDESDelta/IDDESDelta.C

         cw               0.15;

     }



     alphaNut         1.5;

     kappa            0.4187;

     Cb1              0.1355;

     Cb2              0.622;

     Cw2              0.3;

     Cw3              2.0;

     Cv1              7.1;

     Cv2              5.0;

     CDES             0.65;

     ck               0.07;



//These are the default values

     sigmaNut        0.66666;

     kappa           0.41;

     Cb1             0.1355;

     Cb2             0.622;

     Cv1             7.1;

     Cv2             5;

     CDES            0.65;

     ck              0.07;

     Cw2             0.3;

     Cw3             2;

     fwStar          0.424;

     cl              3.55;

     ct              1.63;



}



cubeRootVolCoeffs

{

    deltaCoeff      1;

}



PrandtlCoeffs

{

    delta           cubeRootVol;

    cubeRootVolCoeffs

    {

        deltaCoeff      1;

    }

    smoothCoeffs

    {

        delta           cubeRootVol;

        cubeRootVolCoeffs

        {

            deltaCoeff      1;

        }

        maxDeltaRatio   1.1;

    }

    Cdelta           0.158;

}



vanDriestCoeffs

{

    delta           cubeRootVol;

    cubeRootVolCoeffs

    {

        deltaCoeff      1;

    }

    smoothCoeffs

    {

        delta           cubeRootVol;

        cubeRootVolCoeffs

        {

            deltaCoeff      1;

        }

        maxDeltaRatio   1.1;

    }

    Aplus            26;

    Cdelta           0.158;

}



smoothCoeffs

{

    delta           cubeRootVol;

    cubeRootVolCoeffs

    {

        deltaCoeff      1;

    }

    maxDeltaRatio   1.1;

}



kappa            0.4187;



wallFunctionCoeffs

{

    E                9;

}

Many thanks.

Quote:

Originally Posted by hanis_rda (Post 703398)

hanis_rda

September 20, 2018 04:53

Quote:

Originally Posted by S123 (Post 706750)

Sorry for late reply.

I have changed all 'cubeRootVol' to 'IDDESDelta' in my LESProperties. Hope it will help you.

S123	September 21, 2018 05:52

Thank you very much, Hanis. This worked!! Many thanks & best wishes.

Quote:

Originally Posted by hanis_rda (Post 706893)

Sorry for late reply.

I have changed all 'cubeRootVol' to 'IDDESDelta' in my LESProperties. Hope it will help you.

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