Dear DuMuX experts, While working on a modification of the dumux-course/exercises/exercise-fractures test case I observed that the linear solver crashes if the mesh is too fine. This results in cutting the Newton's time step, which in my case however does not help either..
This behavior is illustrated on the https://git.iws.uni-stuttgart.de/andrian/rate-sensitivity project on github: depending on the mesh density specified in the .geo files grids/fracs_bad.geo or grids/fracs_ok.geo, the linear solver either crashes, or the simulation proceeds as expected. Your feedback is greatly appreciated. Many thanks, Nikolai
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