It would probably be helpful i
 

It would probably be helpful if you did actually declare/read gamma from file.
/Niels

Ok, the tool is working now, b
 

Ok, the tool is working now, but I have to recompile each time I want to use another pair of lower and upper limits.

So, now I'm trying to make the tool work with the input from the shell.

>> liquidPhaseVolumeFraction . . -lowerLimit 0 -upperLimit 0.015 -time 0

or somethin like that..

>> liquidPhaseVolumeFraction . . 0 0.015 -time 0

I don't know how these user inputs are treated, but I tried by putting these lines into my code, which I have altered from the patchAverage.

argList::validArgs.append("lowerLimit");
argList::validArgs.append("upperLimit");

scalar lowerLimit(args.args()[3]);
scalar upperLimit(args.args()[4]);

Of course there are some problems regarding the classes:

DPOpt/liquidPhaseVolumeFraction.o
liquidPhaseVolumeFraction.C: In function 'int main(int, char**)':
liquidPhaseVolumeFraction.C:64: error: cannot convert 'const Foam::string' to 'Foam::scalar' in initialization
liquidPhaseVolumeFraction.C:65: error: cannot convert 'const Foam::string' to 'Foam::scalar' in initialization

It looks like upper and lower limits are read as strings from the shell. Trying to make the variables work inside the code as scalar does not seem to work.

So, where is the clue to read them from the shell as scalar, double or something similar and to be able to address the variables in the further code.

Thanks so far.
Greetings from rainy Germany.

Sorry, I have another question
 

Sorry, I have another question.

Niels, is your code calculating the phase fraction on the patch or on the whole 3D-domain (on the wedge in this case) ?

The snippet calculates the vol
 

The snippet calculates the volume fraction for the entire domain, as the forAll(gamma,gI) loops over all internal cells.