Dear DuMux users, I am working on co2 model and I would like to have some information about the outflow boundary conditions in DuMux box models. In my conceptual model, I have an unconfined aquifer. The top of the aquifer is the ground surface at Patm = 1e5 Pa. In my knowledge, for an unconfined aquifer, we can usually impose the Outflow boundary condition where the masse fraction gradient of components is zero (diffusive flux = 0). I simply used setAllOutflow on the aquifer surface. On DuMux website, I found that this boundary condition is already implemented inside DuMux implicit models, however when I used it, I obtained the same results as Neumann boundary condition. I would like to check with you if my understanding about the this boundary condition is correct and if my results make any sense? Also, I didn't find any documentation on setAllCouplingOutflow<http://www.dumux.org/doxygen-stable/html-2.1/class_dumux_1_1_boundary_types.php#af1a96abab92c3eb33a37d3d2f371f933>. Can you explain the difference between setAllOutflow and this one?
Thanks a lot for your help Best regards Ali NOWAMOOZ
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