Duplicate micro-simulations on interior boundaries of macro-domain decomposition

[mathiskelm]

Problem:
When using macro-domain decomposition each MPI rank is given a bounding box, which is passed to preCICE to obtain coordinates of coupled points contained therein. If such a coupled macro-point lies on the boundary between two bounding boxes it will be included in both and the Micro Manager currently creates a micro simulation for both duplicates of the macro-point and passes their output to preCICE.

• preCICE interprets this as two contributions to the participant's solution and accumulates them, producing incorrect results.
• duplicate micro simulations receive identical macro-data and with no/global adaptivity identical output, wasting computational effort
• with local adaptivity the two micro-simulations may have different associated active simulations and produce different outputs (differences should be minor if similarity measure is not overly generous)

Suggestion:
The Micro Manager should eliminate duplicate micro simulations to save computational time and avoid incorrect data being received by the macro simulation.