Akantu: Swiss-Made Open-Source Finite-Element Library

  

Akantu means a little element in Kinyarwanda, a Bantu language. From now on it is also an open-source object-oriented library which has the ambition to be generic and efficient. Even though the code is written to be generic, Akantu strength are in solid mechanics models for fracture and contact simulations.

The full documentation can be found on ReadTheDocs

Building Akantu

Dependencies

In order to compile Akantu any compiler supporting fully C++14 should work. In addition some libraries are required:

• CMake (>= 3.5.1)
• Boost (pre-processor and Spirit)
• zlib
• Eigen3 (if not present the build system will try to download it)

For the python interface:

• Python (>=3 is recommended)
• pybind11 (if not present the build system will try to download it)

To run parallel simulations:

• MPI
• Scotch

To use the static or implicit dynamic solvers at least one of the following libraries is needed:

• MUMPS (since this is usually compiled in static you also need MUMPS dependencies)
• PETSc

To compile the tests and examples:

• Gmsh
• google-test (if not present the build system will try to download it)

On .deb based systems

sh
> sudo apt install cmake libboost-dev zlib1g-dev gmsh libeigen3-dev
# For parallel
> sudo apt install mpi-default-dev libmumps-dev libscotch-dev
# For sequential
> sudo apt install libmumps-seq-dev

Using conda

This works only for sequential computation since mumps from conda-forge is compiled without MPI support

sh
> conda create -n akantu
> conda activate akantu
> conda install boost cmake
> conda install -c conda-forge mumps

Using homebrew

sh
> brew install gcc
> brew install boost@1.76
> brew tap brewsci/num
> brew install brewsci-mumps --without-brewsci-parmetis

If it does not work you can edit url to http://graal.ens-lyon.fr/MUMPS/MUMPS_5.3.5.tar.gz using the command:

sh
 > brew edit brewsci/num

Configuring and compilation

Akantu is a CMake project, so to configure it, you can follow the usual way:

sh
 > cd akantu
 > mkdir build
 > cd build
 > ccmake ..
 [ Set the options that you need ]
 > make
 > make install

On Mac OS X with homebrew

You will need to specify the compiler explicitly:

sh
> CC=gcc-12 CXX=g++-12 FC=gfortran-12 cmake ..

Considering the homebrew is installed in /opt/homebrew Define the location of the `Scotch` library path:

sh
> cmake .. -DSCOTCH_LIBRARY="/opt/homebrew/lib/libscotch.dylib;/opt/homebrew/lib/libscotcherr.dylib;/opt/homebrew/lib/libscotcherrexit.dylib"

Specify path to all `MUMPS` libraries:

sh
> cmake .. -DMUMPS_DIR=/opt/homebrew/opt/brewsci-mumps

In case the above does not work, specify the `MUMPS` path manually using (e.g.):

sh
> cmake .. -DMUMPS_LIBRARY_COMMON=/opt/homebrew/opt/brewsci-mumps/lib/libmumps_common.dylib

If compilation does not work change the path of the failing libraries to brew downloads in /opt/homebrew/.

Using the python interface

You can install `Akantu` using pip, this will install a pre-compiled version, this works only on Linux machines for now:

sh
 > pip install akantu

You can then import the package in a python script as:

python
 import akantu

The python API is similar to the C++ one. If you encounter any problem with the python interface, you are welcome to do a merge request or post an issue on GitLab.

Tutorials with the python interface

To help getting started, multiple tutorials using the python interface are available as notebooks with pre-installed version of Akantu on Binder. The following tutorials are currently available:

Plate whith a hole loaded

Loaded cohesive crack

Making your constitutive law in python