Hi Dmitry, Dumux differentiates between diffusion (molecular diffusion) and dispersion (a scale effect).
(Dispersion used to be implemented in dumux 2 but some problems and had not been reimplemented after 3.0 since no-one had an immediate used case.) However, you are asking in the right time because there is https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/merge_requests/2921 <https://git.iws.uni-stuttgart.de/dumux-repositories/dumux/-/merge_requests/2921> about to be merged, which adds dispersion back in. Maybe you can have a look at that if this would be suitable to model what you are looking for. Best wishes, Timo > On 22. Nov 2021, at 15:18, Dmitry Pavlov <dmitry.pav...@outlook.com> wrote: > > Hello, > > It is well known that DuMux models (i. e. 1pnc) include diffusion term. If > the velocity of the flow is constant, diffusion and dispersion can > simultaneously be modeled via this one term. But in the case of a radial > flow, velocity decreases with distance from the source, so the dispersion > near the source is bigger than far from the source. > > Is there a way for the user to include e. g. pressure gradient into the > calculation of the diffusion term in 1pnc or 2pnc? > > Best regards, > > Dmitry > > > _______________________________________________ > DuMux mailing list > DuMux@listserv.uni-stuttgart.de > https://listserv.uni-stuttgart.de/mailman/listinfo/dumux
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