[pez]

Hello all,

I'm trying to use a scalarTransport Function Object to track the concentration of particles leaving a water tank, but I keep getting errors. I'm using openFoam 3.0. In my controlDict, I've tried two approaches:

libs  (
      "libutilityFunctionObjects.so"
      );

functions
{
S
      {
          type            scalarTransport;
          outputControl   outputTime;
          resetOnStartUp  false;
          autoSchemes     true;
          fvOptions
          {
               S-01
               {
               type            scalarExplicitSetValue;
               active          true;
               selectionMode   cellZone;
               cellZone        sampleInlet;

               scalarExplicitSetValueCoeffs
                   {
                       injectionRate
                       {
                           U   1.0;
                       }
                   }
               }
          };
      }
}

I get the following error in log.pisoFoam:
--> FOAM FATAL IO ERROR:
keyword selectionMode is undefined in dictionary "IOstream.functions.S.fvOptions.S-01.scalarExplicitSetValueCoeffs"

The other approach I tried in ControlDict was this:

functions
{
  S
    {
        type            scalarTransport;
        functionObjectLibs ("libutilityFunctionObjects.so");
          enabled     true;
          outputControl   outputTime;
          setFormat       csv;
          write interval  1;
        resetOnStartUp  false;
        autoSchemes     true;
        write         true;
          log        true;

    DT 10e-9;
    fvOptions {};

    #includeEtc "caseDicts/postProcessing/scalarTransport/scalarTransportDict.cfg"
    }
}

With this approach, there's no errors, but there's no scalarTransport output in log.pisoFoam:

scalarTransport output:
smoothSolver: Solving for S, Initial residual = 0, Final residual = 0, No Iterations 0

my constant/transportProperties file looks like this:

transportModel  Newtonian;

nu              nu [ 0 2 -1 0 0 0 0 ] 1e-05;

CrossPowerLawCoeffs
{
    nu0             nu0 [ 0 2 -1 0 0 0 0 ] 1e-06;
    nuInf           nuInf [ 0 2 -1 0 0 0 0 ] 1e-06;
    m               m [ 0 0 1 0 0 0 0 ] 1;
    n               n [ 0 0 0 0 0 0 0 ] 1;
}

BirdCarreauCoeffs
{
    nu0             nu0 [ 0 2 -1 0 0 0 0 ] 1e-06;
    nuInf           nuInf [ 0 2 -1 0 0 0 0 ] 1e-06;
    k               k [ 0 0 1 0 0 0 0 ] 0;
    n               n [ 0 0 0 0 0 0 0 ] 1;
}

I'm not sure what to use for a field in the first approach and if I need to define it in a file in the 0 folder. I chose U for velocity. If anyone could share some wisdom on how to get scalarTransport output, I would greatly appreciate it.

[tomf]

Hi,

The error output is actually quite useful.

--> FOAM FATAL IO ERROR:
keyword selectionMode is undefined in dictionary "IOstream.functions.S.fvOptions.S-01.scalarExplicitSetValueCoeffs"

means that OpenFOAM expects a keyword selectionMode inside the scalarExplicitSetValueCoeffs subDict. So I would expect it works if you change your dict to:

S
      {
          type            scalarTransport;
          outputControl   outputTime;
          resetOnStartUp  false;
          autoSchemes     true;
          fvOptions
          {
               S-01
               {
                   type            scalarExplicitSetValue;
                   active          true;

                   scalarExplicitSetValueCoeffs
                   {
                       selectionMode   cellZone;
                       cellZone        sampleInlet;
                       injectionRate
                       {
                           U   1.0;
                       }
                   }
               }
          };
      }
}

Maybe some other error pops up, but this should at least solve your first problem.

[pez]

Thanks so much! Your suggestion solved the first error.

Now, the pisoFoam log is returning

scalarTransport output:
smoothSolver:  Solving for S, Initial residual = 0, Final residual = 0, No Iterations 0

or

scalarTransport output:
--> FOAM Warning : 
    From function void option::checkApplied() const
    in file fvOption/fvOption.C at line 120
    Source S-01 defined for field U but never used
--> FOAM Warning : 
    From function void option::checkApplied() const
    in file fvOption/fvOption.C at line 120
    Source S-01 defined for field U but never used
smoothSolver:  Solving for S, Initial residual = 0, Final residual = 0, No Iterations 0

Why is there no output and what should I be using for my field? I chose velocity because I want to track particles that are flowing through and leaving the tank, but I'm honestly not sure what I should be using. Thanks!

[tomf]

I think that you would need to use "S", since you are creating a source for the S field. So your source just generates 1 "S" per second and you velocity field is used to advect it through the domain.

[pez]

Thanks for your reply. This post: http://www.cfd-online.com/Forums/ope...tsetvalue.html has a different variable for the field than the name of the function object.
Also, after further thought, I'm not sure I should use U since velocity is not a scalar and scalarTransport solves for a scalar. Do you have any other thoughts?

[tomf]

The post you are referencing to is trying to achieve something else. Did you try my suggestion? Because I used a similar approach, which gave me the expected result (note I called my scalar "Lak" instead of "S":

    Lak
    {
        type    scalarTransport;
        functionObjectLibs ("libutilityFunctionObjects.so");
        outputControl outputTime;
        active          true;
        autoSchemes     false;
        nCorr           0;
        resetOnStartUp false;
        fvOptions
        
        {
            SetLak
            {
                type        scalarExplicitSetValue;
                active      true;

                scalarExplicitSetValueCoeffs
                {
                    injectionRate
                    {
                        selectionMode   cellZone;
                        cellZone    LakSet;
                        Lak         1;
                    }
                }
            }
            
        }
    }