Hi Stephane,
Forget the previous email, I sent it accidentally before I finish the
writing. Since you were going to take a look on the VOF approach meanwhile I
have been working these days on the BCG scheme using T as volume fraction.
The first test was promising but next tests has been very discouraging
(maybe I have been doing something wrong) so I have abandoned this line for
your more promising idea of a second order VOF.
direction-split VOF advection loop (this loop would become a VOF +
> associated tracers advection loop). The loop I am talking about is
> here vof.c:1539:gfs_tracer_vof_advection()
Entering in details:
What is your opinion about to add a new class of variable named for
example GfsVariableConcentration for the associated tracers (similar to
GfsVariableCurvature).
About how to apply the SourceDiffusion to this new associated tracers:
- It should be apply in the same loop. right? The loop would become
gfs_tracer_vof_advection_diffusion () instead a gfs_tracer_vof_advection ().
- In a first stage it has to be explicit.
- I am not sure how we can introduce a diffusion flux within the
direction-split VOF scheme.
Maybe these points are naive but I am still trying to understand
gfs_tracer_vof_advection () (I found a bit confusing the concept of
effective volume). I have to study deeper the splitting scheme.
> Note that having such a scheme would also help with other problems
> such as phase change (i.e. evaporation etc...)
You are right, This scheme would abroad a lot the problems affordable with
gerris. I am thinking for example in electrokinetic problems
> Just thinking a bit more about this. A simple way to make the scheme
> second-order spatially is just to weight the VOF fluxes not with the
> cell concentration but with the cell face concentration which can be
> obtained using the cell concentration and slope-limited concentration
> gradients. I think this should work and should be quite simple to
> implement.
In order to be more efficient and not overlap. Do you want I center my
attention to any of the above features (or other you have in mind)?
Cheers
Jose
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