Feel++ Data Files

Feel++ generates various files that are spread over various directories. For this tutorial, it would be beneficial to check the content of these files to familiarize yourself with Feel++.

1. Environment variables

The environment variable FEELPP_REPOSITORY define the root directory where the simulation results will be stored. By default they are set to $HOME/feel.

If you want to change the root directory where the results are stored, define e.g. FEELPP_REPOSITORY.

in Feel++ docker images, such as feel/feelpp, it points to /feel.

For running,

docker run -it -v $HOME/feel:/feel feelpp/feelpp

should get you this output


and here is the result of echo $FEELPP_REPOSITORY in the docker image

feelpp@50381de2bd23:~$ echo $FEELPP_REPOSITORY

2. Results

Results of Feel++ simulations are stored in $FEELPP_REPOSITORY/feel/<your_app_name>/ or in a sub-directory. The name of the directory is np_<num> where num is the number of processors used by the numerical simulation.

2.1. Logfiles

Feel++ uses Google Glog to generate logfiles. They are stored in np_<num>/logs. By default, only the master MPI process produces a logfile. This can be changed using the option:



Default value


Disable logfile generation



log level: 2 enable logging for all processes, 1 enable only for master 0 disable for all processes


2.2. CAD and Meshes

A copy of the mesh and eventually the CAD can be found in np_<num>.

the CAD and mesh are present both when GMSH is used to generate a mesh from Feel++ from a CAD file.