What this MR does / why does DuMux need it:
This adds the possibility to study the heat transfer between one fluid phase and a solid phase with one porenetwork model for the void space coupled to one network model for the solid phase (dualnetwork)
In addition one test case is provided with reference solutions
Notes for the reviewer
Files and test case, where taken from https://git.iws.uni-stuttgart.de/dumux-pub/Koch2021a and modified, such that it is runs on the current master
Before you request a review from someone, make sure to revise the following points:
CHANGELOG.md
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character. Make sure there is no \ No newline at end of file
comment in "Changes" of this MR.