  FluidDyn is a project to foster open-science and open-source in the fluid
dynamics community. It is thought of as a research project to channel
open-source dynamics, methods and tools to do science. We propose a set of
Python packages forming a framework to study fluid dynamics with different
methods, in particular laboratory experiments (package fluidlab), simulations
(packages fluidfft, fluidsim and fluidfoam) and data processing (package
fluidimage). In the present article, we give an overview of the specialized
packages of the project and then focus on the base package called fluiddyn,
which contains common code used in the specialized packages. Packages fluidfft
and fluidsim are described with greater detail in two companion papers, Mohanan
et al. (2018a,b). With the project FluidDyn, we demonstrate that specialized
scientific code can be written with methods and good practices of the
open-source community. The Mercurial repositories are available in Bitbucket
(https://bitbucket.org/fluiddyn/). All codes are documented using Sphinx and
Read the Docs, and tested with continuous integration run on Bitbucket,
Pipelines and Travis. To improve the reuse potential, the codes are as modular
as possible, leveraging the simple object-oriented programming model of Python.
All codes are also written to be highly efficient, using C++, Cython and
Pythran to speedup the performance of critical functions.
