this information is already part of the EclipseState. The reason why this should IMO be avoided is that this enforces an implementation detail (ordering of the permeability matrices) of the simulator on the well model. If this needs to be done for performance reasons, IMO it would be smarter to pass an array of matrices instead of passing a raw array of doubles. I doubt that this is necessary, though: completing the full Norne deck takes about 0.25 seconds longer on my machine, that's substantially less than 0.1% of the total runtime.
Open Porous Media Simulators and Automatic Differentiation Library 
CONTENT
opm-simulators contains simulator programs for porous media flow. It also contains a small library for automatic differentiation built on the Eigen linear algebra package which is used by many of the simulators to handle the building of Jacobians. The most important parts are:
- flow.cpp (a fully implicit black-oil simulator)
- AutoDiffBlock.hpp (class for AD on vectorized data with sparse jacobians)
LICENSE
The library is distributed under the GNU General Public License, version 3 or later (GPLv3+).
PLATFORMS
The opm-simulators module is designed to run on Linux platforms. It is also regularly run on Mac OS X. No efforts have been made to ensure that the code will compile and run on windows platforms.
REQUIREMENTS
opm-simulators requires opm-output, opm-core, and all their requirements (see opm-core/README). In addition, opm-simulators requires the Dune modue dune-istl and Eigen, version 3.1 (has not been tested with later versions).
DOWNLOADING
For a read-only download: git clone git://github.com/OPM/opm-simulators.git
If you want to contribute, fork OPM/opm-simulators on github.
BUILDING
See build instructions at http://opm-project.org/?page_id=36
DOCUMENTATION
Efforts have been made to document the code with Doxygen. In order to build the documentation, enter the command
make doc
in the topmost directory. The class AutoDiffBlock is the most important and most well-documented.
REPORTING ISSUES
Issues can be reported in the Git issue tracker online at:
https://github.com/OPM/opm-simulators/issues
To help diagnose build errors, please provide a link to a build log together with the issue description.
You can capture such a log from the build using the `script' utility, e.g.:
LOGFILE=$(date +%Y%m%d-%H%M-)build.log ;
cmake -E cmake_echo_color --cyan --bold "Log file: $LOGFILE" ;
script -q $LOGFILE -c 'cmake ../opm-core -DCMAKE_BUILD_TYPE=Debug' &&
script -q $LOGFILE -a -c 'ionice nice make -j 4 -l 3' ||
cat CMakeCache.txt CMakeFiles/CMake*.log >> $LOGFILE
The resulting file can be uploaded to for instance gist.github.com.