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Tamaas --- A blazingly fast rough contact library
=================================================
Tamaas is a C++/Python library that implements a number of numerical methods
based on integral equations to efficiently solve contact problems with rough
surfaces. The word تماس (tamaas) means "contact" in Arabic and Farsi.
## Dependencies
Here is a list of dependencies for Tamaas:
- a //C++ compiler// with full //C++14// and //OpenMP// support
- [SCons](https://scons.org/) (python build system)
- [FFTW3](http://www.fftw.org/) compiled with //OpenMP// support
- [boost](https://www.boost.org/) (preprocessor)
- [thrust](https://github.com/thrust/thrust) (1.9.2+)
- [python 3+](https://www.python.org/) (probably works with python 2, but it
is not tested) with [numpy](https://numpy.org/)
- [pybind11](https://github.com/pybind/pybind11) (included as submodule)
- [expolit](https://c4science.ch/source/expolit/) (included as submodule)
Optional dependencies are:
- [scipy](https://scipy.org) (for nonlinear solvers)
- [uvw](https://pypi.org/project/uvw/) (for dumpers)
- [googletest](https://github.com/google/googletest) and
[pytest](https://docs.pytest.org/en/latest/) (for tests)
- [Doxygen](http://doxygen.nl/) and
[Sphinx](https://www.sphinx-doc.org/en/stable/) (for documentation)
Note that a Debian distribution should have the right packages for all these
dependencies (they package the right version of thrust extracted from CUDA in
`stretch-backports non-free` and `buster non-free`).
## Compiling
You should first clone the git submodules that are dependencies to tamaas
(expolit, pybind11 and googletest):
git submodule update --init --recursive
The build system uses SCons. In order to compile Tamaas with the default
options:
scons
After compiling a first time, you can edit the compilation options in the file
`build-setup.conf`, or alternatively supply the options directly in the command
line:
scons option=value [...]
To get a list of //all// build options and their possible values, you can run
`scons -h`. You can run `scons -H` to see the SCons-specific options (among them
`-j n` executes the build with `n` threads and `-c` cleans the build). Note that
the build is aware of the `CXX` and `CXXFLAGS` environment variables.
## Installing
Before you can import tamaas in python, you need to install the python package
in some way.
### Using pip
You have two choices to install tamaas:
- An out-of-repository installation to a given prefix (e.g. `/usr/local`, or a
python virtual environment)
- A development installation to `~/.local` which links to the build directory
The former is simply achieved with:
scons prefix=/your/prefix install
# Equivalent to (if you build in release)
install build-release/src/libTamaas.so* /your/prefix/lib
pip3 install --prefix /your/prefix build-release/python
Make sure however that `/your/prefix/lib` is in your `LD_LIBRARY_PATH` or is a
standard location, otherwise you may get an `ImportError`. The second
installation choice is equally simple:
scons dev
# Equivalent to
pip3 install --user -e build-release/python
This time, you should not have to worry about the position of shared libraries.
The python modules knows where to find them in the build directory. Check that
everything is working fine with:
python3 -c 'import tamaas; print(tamaas)'
### Using environment variables (not recommended)
You can source (e.g. in your `~/.bashrc` file) the file
`build-release/tamaas_environment.sh` to modify the `PYTHONPATH` and
`LD_LIBRARY_PATH` environment variables. This is however not recommended because
these variables may conflict in a python virtual environment (i.e. if you use
`virtualenv` with tamaas).
## Tests
To run tests, execute `pytest build-<build_type>` if you have compiled Tamaas
with tests activated (`scons build_tests=True use_googletest=True`).
## Documentation
The latest documentation is available on
[ReadTheDocs](https://tamaas.readthedocs.io/en/latest/)!
To build the documentation, activate the `build_doc` option. Make sure you have
[sphinx-rtd-theme](https://pypi.org/project/sphinx-rtd-theme/) and
[breath](https://pypi.org/project/breathe/) installed. The compiled indexes for
the doxygen C++ API and Sphinx documentation can be found in
`doc/build/{doxygen,sphinx}/html/index.html`. Beware however that manually
compiling documentation leads to a lot of warnings.
## Examples
Example simulations can be found in the `examples/` directory. There is no
guarantee that the examples in `examples/legacy/` all work however.
- `rough_contact.py` shows a typical normal rough contact simulation
- `adhesion.py` shows how you can derive some classes from Tamaas in python,
here to implement a custom adhesion potential
- `plasticity.py` computes an elastoplastic Hertz simulation and dumps the
result in `examples/paraview/` in VTK format
- `stresses.py` shows how you can compute stresses from a boundary traction
distribution
- the scripts in `pipe_tools` allow to execute elastic contact simulations
without the need to code a custom script (see documentation for more details)
## Contributing
Contributions to Tamaas are welcome! Please follow the guidelines below.
### Report an issue
If you have an account on [c4science](https://c4science.ch), you can [submit an
issue](https://c4science.ch/maniphest/task/edit/?owner=frerot&projectPHIDs=tamaas&view=public).
All open issues are visible on the
[workboard](https://c4science.ch/project/board/2036/), and the full list of
issues is available [here](https://c4science.ch/maniphest/query/1jDBkIDDxCAP/).
### Submit a patch / pull-request
C4Science runs [Phabricator](https://www.phacility.com/phabricator/) to host the
code. The procedure to submit changes to repositories is described in this
[guide](https://secure.phabricator.com/book/phabricator/article/arcanist_diff/).
In a nutshell:
```lang=bash
# Make changes
git commit # Any number of times
arc diff # Pushes all new commits for review
# Wait for review...
arc land # Once the changes are accepted
```
## Citing
Please cite Tamaas as:
Frérot, L., Anciaux, G., Rey, V., Pham-Ba, S., J.-F., Molinari (2019). Tamaas, a
high-performance library for periodic rough surface contact,
[doi:10.5281/zenodo.3479237](https://doi.org/10.5281/zenodo.3479237).
If you use the elastic-plastic contact capabilities of Tamaas, please cite:
Frérot, L., Bonnet, M., Molinari, J.-F. & Anciaux, G. A Fourier-accelerated
volume integral method for elastoplastic contact. Computer Methods in Applied
Mechanics and Engineering 351, 951–976 (2019)
[doi:10.1016/j.cma.2019.04.006](https://doi.org/10.1016/j.cma.2019.04.006).
If you use the adhesive contact capabilities of Tamaas, please cite:
Rey, V., Anciaux, G. & Molinari, J.-F. Normal adhesive contact on rough
surfaces: efficient algorithm for FFT-based BEM resolution. Comput Mech 1–13
(2017)
[doi:10.1007/s00466-017-1392-5](https://doi.org/10.1007/s00466-017-1392-5).
## License
Tamaas is distributed under the terms of the [GNU Affero General Public License
v3.0](https://www.gnu.org/licenses/agpl.html).
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