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Created Jul 11, 2018 by Timo Koch@timokOwner

(Re-)Implement CFL criterion

As a first step of porting the decoupled/sequential models to the new structure, it would be a good thing to implement a CFL criterion for the time step control for the current porousmediumflow models. Add good start is e.g. a CFL is e.g. the 1p_tracer test (https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/tree/master/test/porousmediumflow/tracer/1ptracer) that uses an explicit Euler for the transport but currently has a constant time step that is small enough for the test. CFL would be a big improvement.

@martins Maybe you are the best to deal with this?

Edited Jul 11, 2018 by Timo Koch
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