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Wall function bounce

Helen Schottenhamml requested to merge mr_wall_function_bounce into master

Replaces MR !106 (closed).

In this merge request, a version of the Wall-Function Bounce is implemented as a wall modelling approach. It is based on the corresponding paper by Han et al. and proposes an extension to D3Q27 stencils.
Furthermore, standard sampling shift and a modified mean velocity sampling according to Maronga et al. are proposed.
Different implicit and explicit wall functions are supported.

TODO:

  • Implement WFB
  • Make codegen compliant (problem occurs on waLBerla side and is addressed here)
  • Add unit test
Edited by Helen Schottenhamml

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