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[test][md] Add a convergence test for a coupled Stokes/Darcy problem

Kilian Weishaupt requested to merge feature/stokes-darcy-conv-test into master

This MR adds a coupled stokes/darcy test for which an analytical reference solution exists, taking into account the Beavers-Joseph-Saffman slip conditon.

The test checks for convergence. Three different reference solutions can be chosen on run-time.

We perform the test for the second example of Shiue et al., 2018: "Convergence of the MAC Scheme for the Stokes/Darcy Coupling Problem"

The test comes with a python script that helps to check the mathematical consistency of the reference solution. It also provides the necessary source term. It can therefore help to add new analytical solutions.

Edited by Kilian Weishaupt

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