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Generalize Slip Condition

Martin Schneider requested to merge feature/generalize-slipcondition into master

What this MR does / why does DuMux need it:

  • All slip condition related functions should not be in base problem but instead implemented on level of test problem
  • One should be able to switch slip conditions. Currently BJ was always assumed.

Notes for the reviewer

This is a first draft. There are still some things we should discuss.


  • Can we unify the slip velocity interface? The issue with fcstaggered currently is the fact that the user can pass tangentialVelocityGradient which allows to overwrite derivatives
  • Is the current BJ implementation even correct in 3D? I would have expected that it is not enough to only consider one single tangential direction
  • Also introduce BJS
Edited by Timo Koch

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