Hi Timo, Thank you for your feedback.
I have updated the README.md of the project with some screenshots and more detailed description of the problem, please have a look at https://git.iws.uni-stuttgart.de/andrian/rate-sens-nofrac. Agree on your points for the cell-centered TPFA scheme, but as you can see at the README.md, there are order of magnitude difference between the obtained and expected pressure fields... Can it be that I am setting pressure BC not on a wetting pressure but some other quantity?. How can I set the pressure BC on the wetting phase pressure? Thanks, Nikolai From: Timo Koch <timo.k...@iws.uni-stuttgart.de> Sent: Tuesday, August 7, 2018 18:41 To: DuMuX User Forum <dumux@listserv.uni-stuttgart.de> Cc: Nikolai Andrianov <nand...@dtu.dk> Subject: Re: [DuMuX] Non-constant pressure BC for non-zero capillary pressure 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, 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<mailto: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<mailto:timo.k...@iws.uni-stuttgart.de> D-70569 Stuttgart url: www.hydrosys.uni-stuttgart.de<http://www.hydrosys.uni-stuttgart.de> _______________________________________________________________
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