Feature/freeflow momentum new staggered

Merged Timo Koch requested to merge feature/freeflow-momentum-new-staggered into master
  • Add momentum model for fcstaggered
  • Add a Donea test solving the momentum part of the Stokes equations with given pressure

Part of merging !2201 in smaller parts

Closes #896 (closed)

Edited by Timo Koch

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