  The new software FEniCS-preCICE is a middle software layer, sitting in
between the existing finite-element library FEniCS and the coupling library
preCICE. The middle layer simplifies coupling (existing) FEniCS application
codes to other simulation software via preCICE. To this end, FEniCS-preCICE
converts between FEniCS and preCICE mesh and data structures, provides
easy-to-use coupling conditions, and manages data checkpointing for implicit
coupling. The new software is a library itself and follows a FEniCS-native
style. Only a few lines of additional code are necessary to prepare a FEniCS
application code for coupling. We illustrate the functionality of
FEniCS-preCICE by two examples: a FEniCS heat conduction code coupled to
OpenFOAM and a FEniCS linear elasticity code coupled to SU2. The results of
both scenarios are compared with other simulation software showing good
agreement.
