Good news: yes! You don’t need to implement anything else, the official OpenFOAM adapter is really meant to be a plugin, fully compatible with all the features of preCICE.
But how can a function object travel back in time?
So, you are ready to dive into the code. Let’s have a look into the method
The first thing that this method does is to overwrite the time value, restoring it to the checkpointed value, using the
setTime() method of OpenFOAM:
Good practices dictate that we should avoid using
const_cast at all cost. However, since we don’t want to modify any line of OpenFOAM itself or of the solver, this is our only solution.
What else is checkpointed?
After restoring the time value, the mesh points are moved to their previous locations, in a similar manner:
Afterwards, every object of type
volSymmTensorField is reloaded.
The respective methods have grown quite a while since the adapter was first written and a redesign is due, as described in https://github.com/precice/openfoam-adapter/issues/55.
For more details, you can have a look in my thesis (section 5.3.4):
G. Chourdakis: A general OpenFOAM adapter for the coupling library preCICE [PDF][BibTeX][MediaTum], Master’s thesis, Technical University of Munich, Department of Informatics, October 2017.