[Opm] Flow UNRST binary file format

[Joakim Hove]

     *   You can use the RestartIO class from the the opm-output and write a small C++ program - that way you will only be working with C++/Opm datastructures.
     *   You can write an ert program using the low level ecl_xxx datastructures; if going this way you can use the python bindings.

A third option - would of course to be to modify opm-output, and add the calls to write your data into the RestartIO implemeentation - the RestartIO::save() https://github.com/OPM/opm-output/blob/master/opm/output/eclipse/RestartIO.cpp#L485 could be augmented with something like (untested again):

{
      std::fstream out("pressure.txt" , ios_base::app);
      const auto& p = cells.data("PRESSURE")

      out << sim_time << " ";
      for (const auto& ijk : {{1,2,3} , {2,3,4}})   {
            size_t active_index = grid.getActiveIndex( ijk[0] , ijk[1] , ijk[2]);
             out << p[active_index];
      }

      out.close( );
}

That way you would get 'pressure.txt' file as part of your simulation - which is obviously neat, but you would have to maintain change to C++ code yourself, as I do not see us merging something special like this. I guess this will be the "best" solution - and the Python solution is the simplest. Your call.

Joakim






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