Timo,
Thank you for the good news. I had to update from DuMux 3.4 to be able
to apply the patch, now it seems to work! I implemented the
SpatialParams::dispersionTensor.
One quick question: is there an option to specify different dispersion
coefficients (tensors) for different components? I have one component
that is present only in water and another that is balanced between water
and oil (oil is immobile and not directly present in the model).
Best regards,
Dmitry
On 22.11.2021 17:24, Timo Koch wrote:
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
<mailto: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
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