Hi Timo,
First, I would like to wish a happy new year to everyone.
Thanks a lot for your answer. We will try your idea.
The problem when imposing only a flux on the left side is that the
groundwater flow is unfortunately not uniform. The test case that we
want to consider comes from this reference
https://www.sciencedirect.com/science/article/abs/pii/S1750583615001899
Regards
Etienne
Le 23/12/2021 à 10:24, Timo Koch a écrit :
On 15. Dec 2021, at 18:16, Etienne Ahusborde
<etienne.ahusbo...@univ-pau.fr
<mailto:etienne.ahusbo...@univ-pau.fr>> wrote:
Dear DuMuX,
With my colleagues, we are interested to perform a test case of
injection of CO2 into a reservoir with uniform background hydraulic
head gradients.
<Capture d’écran de 2021-12-15 18-03-19.png>
The configuration is represented in the figure above and the
groundwater flow is 5.5m / year.
We are wondering how it is possible to impose this groundwater flow
in DuMuX.
We inject CO2 as a source term and we tried to impose a flux of water
on the upstream boundary with a velocity of 5.5m / year.
Unfortunately, it does not seem to be the good way to do.
Dear Etienne,
what was the problem with the boundary condition approach? This seems
like the solution with the smallest perturbation of the solution
within the domain.
I don’t fully understand the meaning of the conditions you want to
set. Since the groundwater flow pressure field will be influenced by
the CO2 plume and in a non-linear way fixing a hydraulic heads or even
superimposing a gradient within the domain additively would influence
the physics.
However, maybe in your setup this wouldn’t be important.
In that case you, could modify the flux implementation, e.g.
Dumux::DarcysLaw (or more specifically the specialisation for your
discretisation method) and add a position-dependent background
pressure field (e.g. via a spatial parameter interface) to the
pressures appearing there.
Your pressure solution would then be the pressure difference to that
background pressure field, so to minimise the influence on the
solution the background pressure field should probably be centred
around 0.
You can set your modified Darcy’s law class via the property
“AdvectionType”.
As I haven’t tried something like that myself I can’t guarantee this
works as expected.
Best wishes
Timo
Has someone an idea to how we could impose that?
Thanks in advance for any help
Regards
Etienne
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