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 dev::index.adoc.

Start Feel++ environment

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

  • 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

  • Define meshes

  • Define function spaces

  • Define linear and bilinear forms

  • Solve linear or nonlinear algebraic systems

  • Export data to scientific visualization data formats

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