FAQ

Applications: Can I use FluidSim for

Wall bounded / multiphase / reactive flows …?

Maybe. The built-in solvers excels solving within periodic domains with pseudospectral solvers. However, FluidSim is a framework, and this allows FluidSim to interface with third-party solvers. See for instance fluidsim.base.basilisk, fluidsim.base.dedalus and snek5000.

Troubleshooting installation issues

Make sure you read the installation guide carefully.

Permission denied while running pip install fluidsim from PyPI or make develop inside the repository.

This means you are probably using the Python bundled with the system and as a user you are restricted from installing packages into it. If this is so, create a [virtual environment].

No module named pip or distutils.errors.DistutilsError

Package manager pip was not installed into your environment or is too old. The following commands should help:

python -m ensurepip
python -m pip install --upgrade pip

System freezes or becomes unresponsive as fluidsim starts to build extensions

By default pythran extensions try to use gcc and this is a CPU and memory intensive compilation. Instead pythran can be configured to use clang. See About using Pythran to compile functions for more details.

Additionally to reduce the load during installation one can limit the number of parallel processes used to build extensions.

“ModuleNotFoundError: No module named fluidsim_core. …”

FluidSim depends on fluidsim_core and both follow the same versioning. Make sure the versions match if you had used pip install or conda install. For developers, make develop should install both as editable installations.