Add non-Darcy flow upscaling example
The following discussion from !2420 (closed) should be addressed:
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@timok started a discussion: (+2 comments)
I would be awesome to have a test that computes permeability in one direction for a network e.g. extracted from the Berea sandstone sample for different pressure gradients. Then we could do at least a qualitative comparison with Muljadi et al. https://doi.org/10.1016/j.advwatres.2015.05.019 (essentially reproduce one of the plots of El-Zehairy et al. https://doi.org/10.1016/j.advwatres.2019.103378)