Dear Georg,
In fact, we had the same idea and I can confirm that it works (see
figure in the enclosed file).
Thanks a lot
Etienne
Le 28/11/2017 à 09:01, georg.fut...@dlr.de a écrit :
Hi Etienne,
I think an outflow boundary condition will only work correctly if the phase
that is leaving the domain is perfectly mixed, i.e. there is only transport
perpendicular to the outflow boundary face. You might be able to solve your
problem by appending a kind of pipe to your outflow. This way you are able to
use the outflow condition at the end of the pipe. I am not 100% sure whether
this will work.
Best regards
Georg
-----Ursprüngliche Nachricht-----
Von: Dumux [mailto:dumux-boun...@listserv.uni-stuttgart.de] Im Auftrag von
Etienne Ahusborde
Gesendet: Dienstag, 21. November 2017 13:50
An: DuMuX User Forum; Mohamed Id Moulay
Betreff: [DuMuX] Outflow boundary conditions
Dear DuMuX users,
With my colleagues we are working on an example of reactive flow in porous
medium with an outflow boundary condition.
To emphasize our issue, we have considered a simpler problem using the 1p2c
model where a component X1 is injected in pure water (see the enclosed figures
geometry.png and permeability.png).
There are two zones of injections named Inflow1 and Inflow2 (where a flux is
imposed and a dirichlet boundary conditions is imposed for the concentration of
X1) and an outflow zone. The remaining boundaries are impermeable.
The pictures X1cell.png and X1box.png depict the concentration of the component
X1 after 125s of injection respectively with the cell centered and box schemes.
We can see at the outflow the presence of two pikes at the border between the
outflow and the impermeable zones.
These pikes are unphysical since the maximum value of the concentration should
be equal to the value of the dirichlet condition (that is 0.3).
We would like to know is somebody ever had and fixed this problem?
Thanks in advance.
Best regards
Etienne
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