How to open a file for writing, dump data into it, and close it.
You can also use the STL::fstream class. This makes it easy to manipulate output using
ios:app for appending and
setfill for padding the output with other characters (often zeros).
OpenFOAM file output
// Open the error file for measurement output.. OFstream errorFile(dataFileName); // Nt : number of cells in the tool mesh // Nb : number of cells in the tool mesh // Ev : volume conservation error: // |tool mesh volume from volume fraction - tool mesh volume | / tool mesh volume. // Ti : initialization time, loading the mesh and fields, // Te : execution time of the CCI mesh intersection operation. // Nx : total number of cells that are intersected: larger than the // number of interface cells, as bulk cells are intersected as well. // Ni : number of interface cells, // Nk : number of bulk cells. errorFile << "Nt,Nb,Ev,Ti,Te,Nx,Ni,Nk\n"; ... errorFile << toolMesh.nCells() << "," << baseMesh.nCells() << "," << Ev << "," << Ti << "," << Te << "," << meshIntersection.Nx() << "," << Ni << "," << Nb << nl;
OpenFOAM uses a global object for the newline character: ’nl’, it’s easier to write and corresponds to the OF formatting syntax.