[immortality]

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?

[sharonyue]

Originally Posted by immortality

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

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

        fields
        (
            phi
        );
    }
}

Regards,

[immortality]

thank you.then type massflow in the terminal?

[sharonyue]

Originally Posted by immortality

thank you.then type massflow in the terminal?

Nope,just add this in controlDict, and see what happens in the terminal.

Regards,

[immortality]

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?

[immortality]

can write phi in previous time folders?

[sharonyue]

Originally Posted by immortality

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

Regards,

[immortality]

do you know what does valueOutput mean and why is set to false?

[sharonyue]

Originally Posted by immortality

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.

Regards,

[immortality]

i want a code that can calculate net mass on patches(add mass inflow and outflow on patches) preferably in a time period.

[Bernhard]

Check out the patchAverage and patchIntegrate utilities. They should be able to do what you need.

[immortality]

how can move this thread to post processing forum to get more helps and answers?

[immortality]

patchAverage and patchIntegrate doesn't work on surfaceScalarFields.
any idea?
thanks.

[immortality]

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?

[wyldckat]

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:

Originally Posted by wyldckat

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...

[immortality]

thank you dear Bruno for moving!
the thread gives this error in compiling as I put in Cp thread for more convenience of readers:

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.

[immortality]

is it possible to use a mass flow rate and/or summation of mass on patches during an interval code for compiling?

[wyldckat]

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: http://www.cfd-online.com/Forums/ope...tml#post418739 - 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:
  • http://openfoamwiki.net/index.php/Contrib_calcMassFlow
  • http://openfoamwiki.net/index.php/Co...ceSetUtilities
• After unpacking it, go into the unpacked folder and run:
  

  wmake

• An example of a "system/calcMassFlowDict" is as follows:
  

  /*--------------------------------*- 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:
  

  wmake

• An example of a "system/calcMassFlowDict" is as follows:
  

  /*--------------------------------*- 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

[immortality]

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

[immortality]

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 )