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[test][1pnc] Improve Maxwell-Stefan test

Timo Koch requested to merge fix/test-1p3c-maxwell-stefan into master

Make test more robust by

  • fixing output interval so always the same number of outputs are written
  • use fixed time step size

Decrease runtime by only using 1 cell in y-direction. We test in 2D to test the model in 2D but the specific setup is one-dimensional so the added cells can be spared.

The new reference solution was created with a timestep of 5s. The test uses a timestep of 25s which still reproduces and accurate enough solution so the comparison passes.

Fixes #1158 (closed)

Edited by Timo Koch

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