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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