[RugbyGandalf]

Dear Foam-Community,

i'd like to calculate the surface-area of the inlet-patch for a moving domain for every time step and write out the calculated value in a file in each time-folder.

For now i have the following code:

label inletPatchID = mesh.boundaryMesh().findPatchID("inlet"); 
    std::ofstream file("inlet_area.txt");
    file << gSum(mesh.magSf().boundaryField()[inletPatchID]) << std::endl;
    file.close();

But it only gives out a file in the case-directory (and overwrites it???)

Does anyone has any idea how to solve this?

Regards,
Martin

[Bernhard]

You will have to change the filename, something like this?

std::ofstream file(runTime.timeName(),"inlet_area.txt");

(This will probably not work due to string concatenation)

You also have alternative solutions
- Write to logfile (Info<<) and extract data afterwards from the log file (awk)
- Use a function object. functionObjects run during run time. I am not sure if you can do this with the default ones, but with the swak functionObjects by Bernhard Gschaider you can obtain this information easily for sure.

[RugbyGandalf]

Dear Bernhard,

thank you very much for your answer.
Unfortunately your hint did not work for me. The wmake-compiler gives out the following error:
CarreauYasudaIcoFoam.C:91:59: error: no suitable function for calling »std::basic_ofstream<char>::basic_ofstream(Foam::w ord, const char [15])«

the log-file hint migth work, although i'd really like to add it in the code.

Martin

[Bernhard]

The string concatenation is something I am not to sure about, this is something to dig into, maybe you could use something like "runTime.timeName().string()", but you wil have to experiment a bit.