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WIP: [test][1p] Add 3d convergence test

Timo Koch requested to merge feature/3d-test-nltpfa into feature/nonlinear-schemes

Adds a 2d test on a sphere tet grid (sphere.msh). I also committed a sphere_quad.msh grid which has some nasty distorted quad elements. Unfortunately I currently get for both grids:

Dune::InvalidStateException [decompose:/Users/pumbaa/dune-master/dumux/dumux/discretization/cellcentered/wmpfa/facedatahandle.hh:101]: CoNormal decomposition not found

although the tet version of the grid looks fairly nice.

I wanted to use this test to check if it works in 3D.

For now it's only Dirichlet but it should be relatively easy to try Neumann boundaries.

Edited by Timo Koch

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