## 1. Output Directories

 merge with 02-SettingUpEnvironment.adoc and rewrite pending!

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++.

### 1.1. Environment variables

Some of Feel++ behavior can be driven by environment variables such as

• FEELPP_REPOSITORY

• FEELPP_WORKDIR

Both variables should point to the same place. They define the root directory where the simulation results will be stored. By default they are set to `$HOME/feel`. If you want to change the root directory where the results are stored, define e.g. FEELPP_REPOSITORY. For example in the docker image `feel/apps:latest`, it points to `/feel`. For running, ``docker run -it -v$HOME/feel:/feel feelpp/apps:latest``

should get you this output

``````# Feel++ applications

This image provides the Feel++ applications in
. fluid mechanics
. solid mechanics
. fluid-structure interaction
. thermodynamics
The testcases are in $HOME/Testcases/ and the results are in$HOME/feel

feelpp@50381de2bd23:~$`````` and here is the result of `echo$FEELPP_REPOSITORY` in the docker image
``````feelpp@50381de2bd23:~$echo$FEELPP_REPOSITORY
• Results `$FEELPP_REPOSITORY/feel/<your_app_name>/np_1` ### 1.3. Log files Feel++ uses Google Glog. • Log files : `$FEELPP_REPOSITORY/feel/<your_app_name>/np_1/logs`
• Mesh : `$FEELPP_REPOSITORY/feel/<your_app_name>/np_1` • Config files : `$FEELPP_REPOSITORY/<your_build_folder>/doc/manual/tutorial`