How Feel++ works

Feel++ is not one application, one executable, it is a set of libraries and applications. It provides a framework to deal with each step of the pipeline for solving partial differential equations. Feel++ applications, however, do share commonalities: they follow necessary and optional steps that we describe below in a general manner. More technical details are available in the Developer Manual.

Start Feel++ environment

When executing a Feel++ application, a runtime environment is started. It enables

retrieving remote data
creating a directory where the results of the applications are stored
command line options and configuration files
parallel computing: both MPI and multi-threading.
logging support: log files are generated by the Feel++ library. They contain information about how the applications run.
{optional) enabling parallel solver frameworks PETSc and SLEPc

Do some general operations

The following steps are optional but are very common in Feel++ applications including the Feel++ Toolboxes

Define and partition meshes
Define function spaces
Define linear and bilinear forms
Solve linear or nonlinear algebraic systems
Export data to scientific visualization data formats
Upload result data to a data management system

Exit Feel++ environment

When exiting a Feel++ application, the system is properly shutdown:

all files are saved and closed.
(optional) the parallel solver frameworks are shut down
the parallel computing framework is shutdown