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.. Tamaas documentation master file, created by sphinx-quickstart on Mon Apr 29
18:08:33 2019. You can adapt this file completely to your liking, but it
should at least contain the root `toctree` directive.
Tamaas --- A blazingly fast rough contact library
=================================================
Tamaas (from تماس meaning "contact" in Arabic and Farsi) is a high-performance
rough-surface periodic contact code based on boundary and volume integral
equations. The clever mathematical formulation of the underlying numerical
methods (see e.g. `10.1007/s00466-017-1392-5
<https://doi.org/10.1007/s00466-017-1392-5>`_ and `arXiv:1811.11558
<https://arxiv.org/abs/1811.11558>`_) allows the use of the fast-Fourier
Transform, a great help in achieving peak performance: Tamaas is consistently
**two orders of magnitude faster** (and lighter) than traditional FEM!
Quickstart
----------
Here is a quick introduction to get you started with Tamaas.
Installation
^^^^^^^^^^^^
First make sure the following dependencies are installed for Tamaas:
- a **C++ compiler** with full **C++14** and **OpenMP** support
- **SCons** (python build system)
- **FFTW3** compiled with **OpenMP** support
- **thrust** (1.9.2+)
- **boost** (pre-processor)
- **python 3+** (probably works with python 2, but it is not tested) with
**numpy**
- **pybind11** (included as submodule)
- **expolit** (included as submodule)
Optional dependencies are:
- **scipy** (for nonlinear solvers)
- **uvw** (for dumpers)
- **googletest** and **pytest** (for tests)
- **Doxygen** and **Sphinx** (for documentation)
.. tip:: On a HPC environment, use the following variables to specify where the
dependencies are located:
- ``FFTW_ROOT``
- ``THRUST_ROOT``
- ``BOOST_ROOT``
- ``PYBIND11_ROOT``
- ``GTEST_ROOT``
.. note:: You can use the provided Dockerfile to build an image with the
external dependencies installed.
You should first clone the git submodules that are dependencies to tamaas
(`expolit <https://c4science.ch/source/expolit/>`_, `pybind11
<https://github.com/pybind/pybind11>`_ and `googletest
<https://github.com/google/googletest>`_)::
git submodule update --init --recursive
The build system uses `SCons <https://scons.org/>`_. 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.
Once compiled, you can install the python module with::
scons install prefix=/your/prefix
The above command automatically calls ``pip(3)`` if it is installed, and falls
back on ``setuptools`` otherwise. If you do not want to install Tamaas, you can
use the following command::
scons dev
This creates a symlink in ``~/.local/lib/<python version>/site-packages`` and
is equivalent to ``pip(3) install -e`` or ``./setup.py develop``. You can check
that everything is working fine with::
python3 -c 'import tamaas; print(tamaas)'
Using Docker
............
The Tamaas repository provides a `Dockerfile` that describes an appropriate
build environment. You can use it in the following way::
# Build the image, run it and mount the tamaas repository
docker build -t tamaas_build .
docker run -v $PWD:/app/tamaas -it tamaas_build bash
# Once in the image shell: compile and install
cd /app/tamaas
scons
scons dev
The image also has some of the dependencies required to run the examples below
(matplotlib, uvw).
Running the contact pipe tools
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
In the ``examples/pipe_tools`` folder, you will find three scripts that can be
used to explore the mechanics of elastic rough contact:
- ``surface`` generates randomly rough surfaces (see :doc:`rough_surfaces`)
- ``contact`` solves a contact problem with a surface read from ``stdin`` (see
:doc:`contact`)
- ``plot`` simply plots the surface tractions and displacements read from
``stdin``
Here's a sample command line for you to try out::
./surface --cutoffs 2 4 64 --size 512 512 --hurst 0.8 | ./contact 1 | ./plot
Check out the help of each script for a description of the arguments.
Library overview
----------------
Tamaas is mainly composed of three components:
- Random surface generation procedures
- Model state objects and operators
- Contact solving procedures
These parts are meant to be independent as well as inter-operable. The first one
provides an interface to several stochastic surface generation algorithms
described in :doc:`rough_surfaces`. The second provides an interface to a state
object :py:class:`Model <tamaas._tamaas.Model>` (and C++ class
:cpp:class:`tamaas::Model`) as well as integral operators based on the state
object (see :doc:`model`). Finally, the third part provides contact solving
routines that make use of the integral operators for performance (see
:doc:`contact`).
Contribution
------------
You can contribute to Tamaas by reporting any bugs you find `here
<https://c4science.ch/maniphest/task/edit/?owner=frerot&projectPHIDs=tamaas&view=public>`_
if you have an account on `c4science <https://c4science.ch>`_.
To contribute code to Tamaas, you can use `Arcanist
<https://secure.phabricator.com/book/phabricator/article/arcanist/>`_ to send
code differentials. To know if you break anything, you can run the tests with::
scons test
Make sure you have `pytest <https://docs.pytest.org/en/latest/>`_ installed.
.. toctree::
:maxdepth: 2
:caption: Table of Contents:
./rough_surfaces
./model
./contact
./api_reference
Indices and tables
==================
* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`
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