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<img src="doc/logo/dumux_logo_hires_whitebg.png" alt="dumux logo" width="400"/>
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What is DuMu<sup>x</sup>?
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===============
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[DuMu<sup>x</sup>][0] is a simulation toolbox mainly aimed at flow and transport
processes in porous media. DuMu<sup>x</sup> is based on the [DUNE][1]
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framework and aims to provide a multitude of numerical models as well
as flexible discretization methods for complex non-linear phenomena,
such as CO2 sequestration, soil remediation, drug delivery in cancer
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therapy and more. Have a look at our publications
(see below: [How to cite](#how-to-cite))
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for a more detailed description of the goals and motivations behind DuMu<sup>x</sup>.
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Installation
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===============
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Have a look at the [installation guide][3] or use the [DuMu<sup>x</sup> handbook][4],
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Chapter 2.
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Documentation
==============

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The following resources are useful to get started with DuMu<sup>x</sup>:
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* [Getting started guide](https://dumux.org/gettingstarted/) on the [DuMu<sup>x</sup> website](https://dumux.org/)
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* [Handbook](https://dumux.org/docs/handbook/master/dumux-handbook.pdf), a detailed DuMu<sup>x</sup> manual,
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* [DuMu<sup>x</sup> course materials](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/tree/master),
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* [Examples](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/tree/master/examples), with detailed description of code and results,
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* [Class documentation](https://dumux.org/docs/doxygen/master/) generated from the source code,
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* [Mailing list](https://listserv.uni-stuttgart.de/mailman/listinfo/dumux),
* [Changelog](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/blob/master/CHANGELOG.md), where all changes between different release versions are listed and explained.

Some helpful code snippets are available in the [Wiki](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/wikis/home).
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License
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========
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DuMu<sup>x</sup> is licensed under the terms and conditions of the GNU General
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Public License (GPL) version 3 or - at your option - any later
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version. The GPL can be [read online][5] or in the [LICENSE.md](LICENSE.md) file
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provided in the topmost directory of the DuMu<sup>x</sup> source code tree.
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Please note that DuMu<sup>x</sup>' license, unlike DUNE's, does *not* feature a
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template exception to the GNU General Public License. This means that
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you must publish any source code which uses any of the DuMu<sup>x</sup> header
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files if you want to redistribute your program to third parties. If
this is unacceptable to you, please [contact us][6] for a commercial
license.

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See the file [LICENSE.md](LICENSE.md) for full copying permissions.
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How to cite
============

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DuMu<sup>x</sup> is research software and developed at research institutions.
If you are using DuMu<sup>x</sup> in scientific publications and in
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the academic context, please cite (at least one of)
our publications:
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* [Koch, T., Gläser, D., Weishaupt, K., Ackermann, S., Beck, M., Becker, B.,
  Burbulla, S., Class, H., Coltman, E., Emmert, S., Fetzer, T., Grüninger, C.,
  Heck, K., Hommel, J., Kurz, T., Lipp, M., Mohammadi, F., Scherrer, S.,
  Schneider, M., Seitz, G., Stadler, L., Utz, M., Weinhardt, F.
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  & Flemisch, B. (_2021_). __DuMu<sup>x</sup> 3 – an open-source simulator for solving flow
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  and transport problems in porous media with a focus on model coupling.__
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  _Computers & Mathematics with Applications_, 81, 423-443.
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  https://doi.org/10.1016/j.camwa.2020.02.012][7]

* [Flemisch, B., Darcis, M., Erbertseder, K., Faigle, B., Lauser, A.,
  Mosthaf, K., Müthing, S., Nuske, P., Tatomir, A., Wolff, M.,
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  & Helmig, R. (_2011_). __DuMu<sup>x</sup>: DUNE for multi-{phase,component,scale,physics,…}
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  flow and transport in porous media__.
  _Advances in Water Resources_, 34(9), 1102–1112.
  https://doi.org/10.1016/j.advwatres.2011.03.007][2]

You can also cite specific releases published on Zenodo:
[![zenodo badge](https://zenodo.org/badge/DOI/10.5281/zenodo.2479594.svg)](https://doi.org/10.5281/zenodo.2479594)



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Automated Testing / Test suite
===============================
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* Latest release (3.4): [![release build badge](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/badges/releases/3.4/pipeline.svg)](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/pipelines?page=1&scope=all&ref=releases/3.4)
* Master branch (development / unstable): [![master build badge](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/badges/master/pipeline.svg)](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/pipelines?page=1&scope=all&ref=master)

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DuMu<sup>x</sup> features many tests (some unit tests and test problems) that
are continuously and automatically tested in the GitLab-CI framework (see badges).
The test suite is based on CTest and can also be built and run manually
```
make -j8 build_tests && ctest -j8
```
The tests are labelled (see `CMakeLists.txt` of each individual test for its labels).
You can build and run tests of a specific label (e.g. `2p` for two-phase flow porous medium model tests) like this
```
make -j8 build_2p_tests && ctest -j8 -L ^2p$
```
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__Running individual tests__

To find out how to build a test inspect the `CMakeLists.txt` file in the respective test folder. 

The `dumux_add_test`
command specifies some important parameters: `NAME` sets the name of the test. There is either `SOURCES` or `TARGET`
specified. If `SOURCES` is specified `NAME`, corresponds to the build target, otherwise `TARGET` is the build target.

You can build the test by running `make REPLACE_BY_NAME_OF_BUILD_TARGET` (when using GNU Makefiles (default) this is possible
within the test folder in the build directory, for `ninja` it has to be executed in the top-most build folder level).

Some tests may depend on additional optional dependencies. You can find this by inspecting the argument `CMAKE_GUARD`,
e.g. `HAVE_UMFPACK` means UMFPack is required (via installing Suitesparse), or `( "dune-foamgrid_FOUND" AND "dune-alugrid_FOUND" )`
means that the test requires the additional Dune modules `dune-foamgrid` and `dune-alugrid`. For installing
external dependencies, have a look at the [Handbook](https://dumux.org/docs/handbook/master/dumux-handbook.pdf)
and the script [dumux/bin/installexternal.py](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/blob/master/bin/installexternal.py).

__Test coverage__

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[![coverage report](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-coverage/badges/master/coverage.svg)](https://pages.iws.uni-stuttgart.de/dumux-repositories/dumux-coverage/)
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A weekly coverage report of the test suite is created by gcovr/gcov. The report
currently doesn't include non-instantiated code, so the real coverage is likely lower. However,
only a few lines of code are never instatiated in the comprehensive test suite.


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Contributing
=============

Contributions are highly welcome. Please ask questions over the [mailing list](mailto:dumux@listserv.uni-stuttgart.de).
Please review the [contribution guidelines](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/blob/master/CONTRIBUTING.md)
before opening issues and merge requests. For bug reports contact us
over the mailing list, or file an [issue](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/issues). For bug fixes,
feature implementations open a [merge request](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/merge_requests)
or send us formatted patches.
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Backwards Compatibility
=======================

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For a detailed description of the backwards compatibility policy,
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please see [contribution guidelines](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/blob/master/CONTRIBUTING.md).

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DuMu<sup>x</sup> releases are split into major(e.g. 2.0, 3.0) and minor (e.g. 3.1, 3.2, 3.3) releases.
Major releases are not required to maintain backwards compatibility (see below),
but would provide a detailed guide on how to update dependent modules.
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For each minor release, maintaining backwards compatibility is strongly encouraged and recommended.

Despite the goal of maintaining backwards compatibility across minor releases,
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for more complicated changes, this is decided upon on a case to case basis, due to limited developer resources.
In the case that implementing full backwards compatibility for an update is not feasible, or would require unreasonable resources,
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the degree of backwards compatibility be decided by a vote in one of the monthly core developer meetings.

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Major version update, 2.12 to 3.0
===================================

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With the version update to version 3, many features have been added and a lot has been improved in DuMu<sup>x</sup>. See the
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[changelog](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/blob/master/CHANGELOG.md) for a list of changes.
If you decide to update from version 2.12, please have a look at our small
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[guide](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/wikis/Hints/Upgrade-to-Dumux-3)
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on how to update an application to the new version.

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[0]: https://dumux.org
[1]: https://dune-project.org/
[2]: https://dumux.org/documents/dumux_awrpaper.pdf
[3]: https://dumux.org/installation
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[4]: https://dumux.org/docs/handbook/master/dumux-handbook.pdf
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[5]: https://www.gnu.org/licenses/gpl-3.0.en.html
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[6]: https://www.iws.uni-stuttgart.de/en/lh2/
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[7]: https://doi.org/10.1016/j.camwa.2020.02.012