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processorAgglomeration broken for processor boundaries

Summary

GAMG processorAgglomeration behaves differently w.r.t v2306. Convergence when embedded in GAMG seems to be worse.

Might originate from

#2993 (closed)

Steps to reproduce

Get e.g. potentialFoam/pitzDaily. Set up processorAgglomerator masterCoarsest and use random decomposition method. Number of GAMG iterations is very different compared to previous versions.

Example case

See above

What is the current bug behaviour?

See above

What is the expected correct behavior?

Repeat of v2306 behaviour

Relevant logs and/or images

Environment information

  • OpenFOAM version : v2312 (v2306 and before is ok)
  • Operating system :
  • Hardware info :
  • Compiler :

Possible fixes

Processor 'patches' should be merged into internal faces - so the boundary coefficients become internal coefficients. This seems not to happen.

@Prashant @andy

Edited by Mattijs Janssens