[petsc-users] Regarding P4est

[Mark Adams]

So you get this noise with a regular grid in p4est. So the same grid as
will Plex, and you are not getting the same results.

I don't know of any difference from p4est on a non-adapted grid. Can you
reproduce this with ex11?

Matt and Toby could answer this better.


On Wed, Jun 17, 2020 at 1:33 PM MUKKUND SUNJII <mukkundsunjii at gmail.com>
wrote:

> Greetings,
>
> I am a master’s student working on the shallow water model of the TS
> example 'ex11.c' as part of my thesis. Therefore, I am working with
> DMForest for the implementation of adaptive grids. I have a question and an
> observation.
>
> I am trying to find relevant information about interpolation that takes
> place through the routine DMForestTransferVec. Perhaps it could be my
> inability to find it, but I am unable to locate the implementation of the
> routine
>
> (forest->transfervec)(dmIn,vecIn,dmOut,vecOut,useBCs,time).
>
> Any information on this particular routine is highly appreciated.
>
> Furthermore, I have developed a well balanced Riemann Solver that includes
> topography in the model. In the process of testing both the non-adaptive
> and adaptive version, I found that my results differed when I changed the
> type of DM. For instance, when I run a scenario in a fixed, non-adaptive
> grid  with a DM of type 'P4est', I find that the well balanced nature is
> lost due to small perturbations all across the domain. However, this does
> not occur when I use a DM of type ‘plex’. Is there a radical change in the
> routines between the two DM’s? This is not as much of a question as it is
> an observation.
>
> Thank you for all of your suggestions!
>
> Regards,
>
> Mukkund
>
>
>
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