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is there a post processing keyword for obtaining mass flow rate and total mass?

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Old   April 1, 2013, 17:07
Default is there a post processing keyword for obtaining mass flow rate and total mass?
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I was searching about a function to calculate mass flow rate during the run.now i need to calculate mass flow rate and also total mass entering in or exiting from a patch after the end of run.does anyone know the related keyword or way to do this?
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Old   April 1, 2013, 23:06
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Quote:
Originally Posted by immortality View Post
I was searching about a function to calculate mass flow rate during the run.now i need to calculate mass flow rate and also total mass entering in or exiting from a patch after the end of run.does anyone know the related keyword or way to do this?

Hi,

Try this code from Mr.Prasant

Code:
functions
{
    massflow
    {
        type            faceSource;
        functionObjectLibs ("libfieldFunctionObjects.so");
        enabled         true;
        outputControl    timeStep;
        log             true;
        valueOutput     false;
        source          patch;
        sourceName      yourpatchname;
        operation       sum;

        fields
        (
            phi
        );
    }
}
Regards,
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Old   April 2, 2013, 00:15
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thank you.then type massflow in the terminal?
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Old   April 2, 2013, 02:35
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Quote:
Originally Posted by immortality View Post
thank you.then type massflow in the terminal?
Nope,just add this in controlDict, and see what happens in the terminal.

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Old   April 2, 2013, 05:27
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i think this add mass flow rates in new time folders.is there a way to calculating it after the run has done?like keywords Mach,Pe,vorticity,etc in postProcessing?
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Old   April 2, 2013, 08:57
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can write phi in previous time folders?
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Old   April 2, 2013, 08:59
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Quote:
Originally Posted by immortality View Post
i think this add mass flow rates in new time folders.is there a way to calculating it after the run has done?like keywords Mach,Pe,vorticity,etc in postProcessing?
I am not sure for that,if you know just let me know.Thanks

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Old   April 2, 2013, 09:08
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do you know what does valueOutput mean and why is set to false?
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Old   April 2, 2013, 19:29
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Quote:
Originally Posted by immortality View Post
do you know what does valueOutput mean and why is set to false?
Sorry,I forget that,but you can alter that and see what happens.

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Old   April 3, 2013, 04:05
Default how to obtain mass balance after run?
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i want a code that can calculate net mass on patches(add mass inflow and outflow on patches) preferably in a time period.
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Old   April 3, 2013, 06:31
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Check out the patchAverage and patchIntegrate utilities. They should be able to do what you need.
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Old   April 3, 2013, 09:44
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how can move this thread to post processing forum to get more helps and answers?
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Old   April 3, 2013, 16:48
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patchAverage and patchIntegrate doesn't work on surfaceScalarFields.
any idea?
thanks.
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Old   April 3, 2013, 17:04
Default whats the command for calculating mass flow?
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I was searching about a function to calculate mass flow rate during the run.now i need to calculate mass flow rate and also total mass entering in or exiting from a patch after the end of run.does anyone know the related keyword or way to do this?
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Old   April 3, 2013, 19:19
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Greetings to all,

I've moved this thread to the post-processing forum. And to quote my answer from a few minutes ago on another thread:
Quote:
Originally Posted by wyldckat View Post
For calculating mass flow, the following has been around for several years now: http://openfoamwiki.net/index.php/Contrib_calcMassFlow
Best regards,
Bruno

PS: also moved a few other related posts/threads started by Ehsan...

Last edited by wyldckat; April 3, 2013 at 19:23. Reason: see "PS:"
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Old   April 4, 2013, 08:02
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thank you dear Bruno for moving!
the thread gives this error in compiling as I put in Cp thread for more convenience of readers:
Code:
ehsan@Ehsan-com:~/Desktop/calcMassFlow$ wmake
Making dependency list for source file calcMassFlow.C
could not open file fvCFD.H for source file calcMassFlow.C
could not open file FaceSetUtilities.H for source file calcMassFlow.C
SOURCE=calcMassFlow.C ;  g++ -m64 -Dlinux64 -DWM_DP -Wall -Wextra -Wno-unused-parameter -Wold-style-cast -Wnon-virtual-dtor -O3  -DNoRepository -ftemplate-depth-100 -I/opt/openfoam220/src/cfdTools/lnInclude -I/opt/openfoam220/src/cfdTools/general/lnInclude 	 -I/opt/openfoam220/src/meshTools/lnInclude 	 -I/home/ehsan/OpenFOAM/ehsan-2.2.0/Libraries/cellFaceSetUtilities/lnInclude -IlnInclude -I. -I/opt/openfoam220/src/OpenFOAM/lnInclude -I/opt/openfoam220/src/OSspecific/POSIX/lnInclude   -fPIC -c $SOURCE -o Make/linux64GccDPOpt/calcMassFlow.o
calcMassFlow.C:33:19: fatal error: fvCFD.H: No such file or directory
compilation terminated.
make: *** [Make/linux64GccDPOpt/calcMassFlow.o] Error 1
could you please help to modify it too?
if mass flow trouble resolves almost my work can be finished successfully.
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Old   April 4, 2013, 17:54
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is it possible to use a mass flow rate and/or summation of mass on patches during an interval code for compiling?
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Old   April 6, 2013, 07:51
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Hi Ehsan,

Just a little pointer before continuing to the issue with calcMassFlow - simpleFunctionObjects can easily be used for calculating the mass flow during run: Masse flow rate - although I vaguely remember you writing somewhere about how you need to calculate it after the solver had already been executed.

So, moving onto the adaptation of calcMassFlow to OpenFOAM 2.2:
  • Attached is the adaptation I've quickly made, based on the following sources:
  • After unpacking it, go into the unpacked folder and run:
    Code:
    wmake
  • An example of a "system/calcMassFlowDict" is as follows:
    Code:
    /*--------------------------------*- C++ -*----------------------------------*\
    | =========                 |                                                 |
    | \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
    |  \\    /   O peration     | Version:  2.2.x                                 |
    |   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
    |    \\/     M anipulation  |                                                 |
    \*---------------------------------------------------------------------------*/
    FoamFile
    {
        version     2.0;
        format      ascii;
        class       dictionary;
        location    "system";
        object      calcMassFlowDict;
    }
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
    
    bcs
    (
    left  
    right
    );
    
    //Example for setting rho - uncomment the next line
    //rho rho [ 1 -3 0 0 0 0 0 ] 1.0;
WARNING: I have not thoroughly tested this... I've only made a quick adaptation of the code. Therefore, I advise you to use funkyDoCalc, as addressed on the other thread: http://www.cfd-online.com/Forums/ope...uring-run.html

_________________________
Edit: as per requested, I've managed to create a variant that writes to file instead of the standard output. Based on the instructions above, here's the ones for calcMassFlow2File to OpenFOAM 2.2:
  • After unpacking it, go into the unpacked folder and run:
    Code:
    wmake
  • An example of a "system/calcMassFlowDict" is as follows:
    Code:
    /*--------------------------------*- C++ -*----------------------------------*\
    | =========                 |                                                 |
    | \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
    |  \\    /   O peration     | Version:  2.2.x                                 |
    |   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
    |    \\/     M anipulation  |                                                 |
    \*---------------------------------------------------------------------------*/
    FoamFile
    {
        version     2.0;
        format      ascii;
        class       dictionary;
        location    "system";
        object      calcMassFlowDict;
    }
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
    
    bcs
    (
    left  
    right
    );
    
    //Output file name
    outputFileName "inlet_outlet.log";
    
    //option for outputting with no units
    outputWithoutUnits yes;
    
    //Example for setting rho - uncomment the next line
    //rho rho [ 1 -3 0 0 0 0 0 ] 1.0;
  • The new keyword "outputFileName" is for defining the file where the values are saved.
  • The other new keyword "outputWithoutUnits" is for choosing whether the units should be present inside the file or not, but just for the mass flow values.
  • The application name is calcMassFlow2File.

Best regards,
Bruno
Attached Files
File Type: gz calcMassFlow_for_OF2.2.tar.gz (5.0 KB, 7 views)
File Type: gz calcMassFlow2File_for_OF2.2.tar.gz (5.3 KB, 7 views)
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Last edited by wyldckat; April 14, 2013 at 06:47. Reason: added calcMassFlow2File
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Old   April 6, 2013, 09:47
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Thank you dear Bruno.it works.i put the results in a log file.
is it possible that all left flow rate values be writed separately and after ending of left values right values be writed too.
like:
left:
time0 value0
time1 value1
time2 value2
.
.
.
right:
time0 value0
time1 value1
time2 value2
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Old   April 9, 2013, 05:51
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could you please do some modifications in very useful (i think the sole)post processing tool for calculating mass flow rate to write in a file with a good order?then it will be a complete nice tool for anyone to refer to(and specially for me )
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