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Cleanup/maxwell stefan use harmonicmean for tpfa

Katharina Heck requested to merge cleanup/maxwell-stefan-use-harmonicmean-for-tpfa into master

What this MR does / why does DuMux need it: This cleans up the Maxwell-Stefan tpfa diffusion law. Previously we used a version, where the tpfa calculation was harder to read and e.g. the calculation of the mole fraction gradient was not obvious but hidden in vector-matrix multiplications. This is not practical if we want to add more driving forces of diffusion.

Todo:

  • use branchingFacetX or remove it --> removed as there is currently no test for maxwellstefan and network grids
  • add this for staggered grid implementation
  • add this for the stokes-darcy coupling data
Edited by Katharina Heck

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