Hi Nikolai,
It's a bit hard to say without seeing the results. Can you provide some
screenshot or something so that it is clear how much the pressure is
deviation where and when (only at the beginning of the simulation)?
One thing that might help: you are using the cell-centered TPFA scheme
so Dirichlet boundary conditions are imposed weakly on the boundary
faces. This means that if you visualize the cell center degrees of
freedom, they are not actually equal to the boundary values, they are
rather the values half a cell away from the boundary. So if you start
with a large saturation gradient (from sw=swr to sw=1 at the boundary)
it might take some time until the pressure in the boundary cell is close
to the Dirichlet value.
Best wishes
Timo
On 07.08.2018 18:00, Nikolai Andrianov wrote:
Dear DuMuX experts,
I wonder what can be the reason for the following strange behavior I
observe with a simple waterflooding simulation.
It is a water injection into an oil-saturated 2D block, the fluids are
considered as incompressible. Dirichlet boundary conditions are
imposed at left and right boundaries, whereas there are no-flow at top
and bottom boundaries. Brooks-Corey relative permeabilities and
capillary pressure curve are used.
Despite the fact, that the boundary conditions are set for the wetting
phase pressure, the pressure values at the boundary appear to be quite
different from the prescribed ones in case of non-zero capillary
pressure. If Pc=0, the pressure boundary values do take the values
prescribed in the problem formulation.
The project is available at
https://git.iws.uni-stuttgart.de/andrian/rate-sens-nofrac
<https://git.iws.uni-stuttgart.de/andrian/rate-sens-nofrac>, and I
would appreciate if you could comment on what’s going wrong.
Thanks,
Nikolai
PS: I work with the dumux-course branch.
_______________________________________________
Dumux mailing list
Dumux@listserv.uni-stuttgart.de
https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
--
_______________________________________________________________
Timo Koch phone: +49 711 685 64676
IWS, Universität Stuttgart fax: +49 711 685 60430
Pfaffenwaldring 61 email: timo.k...@iws.uni-stuttgart.de
D-70569 Stuttgart url: www.hydrosys.uni-stuttgart.de
_______________________________________________________________
_______________________________________________
Dumux mailing list
Dumux@listserv.uni-stuttgart.de
https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
