[petsc-users] multi level octree AMR

[Matthew Knepley]

On Thu, Nov 9, 2017 at 10:35 AM, Yann JOBIC <yann.jobic at univ-amu.fr> wrote:

> Hi,
>
> I succeed in having a basic AMR running on my FE advection/diffusion
> problem ( https://mycore.core-cloud.net/index.php/s/DmiiTwKUpV9z5qL)
>
> I now want to have multiple levels in my octree AMR from p4est.
>

Can we be more specific here. I assume p4est did more than 1 level of
refinement to create the adapted mesh. Do you mean several meshes (a
hierarchy)?


> I tried a lot with IS tagged arrays, but i didn't succeed so far. When i
> get from VecTaggerAbsoluteSetBox an IS array of the cells, it seems that
> the DM cell numbering is changed after multiple time iterations (from
> TSSolve), even if the DM is not changed at all.


If the DM does not change, the point numbering and the dof numbering stay
the same.


> I tried to identify the cells to refine/coarse with ISDifference and
> ISExpand, from two different time solutions of the same DM. That made me
> wondering if i'm using the correct tool (IS array).
>

Can you give a pseudocode description of what you are doing?

It sounds like you just want to call DMAdaptLabel() a few times in a row,
with different labels and DMs.

  Thanks,

     Matt


> Am i in the right direction ?
>
> Thanks,
>
> Regards,
>
> Yann
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/~mk51/>
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