[petsc-users] non-manifold DMPLEX

[Patrick Sanan]

Here you have the following "points":

- 1 3-cell (the cube volume)
- 7 2-cells (the 6 faces of the cube plus the extra one)
- 16 1-cells  (the 12 edges of the cube, plus 3 extra ones from the extra
face, plus the extra edge)
- 11 0-cells (the 8 vertices of the cube, pus 2 extra ones from the extra
face, plus the extra vertex)

You could encode your mesh as here, by directly specifying relationships
between these points in the Hasse diagram:
https://petsc.org/release/docs/manual/dmplex/#representing-unstructured-grids

Then, maybe the special relation is captured because you've defined the
"cone" or "support" for each "point", which tells you about the local
topology everywhere. E.g. to take the simpler case, three of the faces have
the yellow edge in their "cone", or equivalently the yellow edge has those
three faces in its "support".



Am Fr., 10. Dez. 2021 um 17:04 Uhr schrieb TARDIEU Nicolas via petsc-users <
petsc-users at mcs.anl.gov>:

> Dear PETSc Team,
>
> Following a previous discussion on the mailing list, I'd like to
> experiment with DMPLEX with a very simple non-manifold mesh as shown in the
> attached picture : a cube connected to a square by an edge and to an edge
> by a point.
> I have read some of the papers that Matthew et al. have written, but I
> must admit that I do not see how to start...
> I see how the define the different elements but I do not see how to
> specify the special relationship between the cube and the square and
> between the cube and the edge.
> Once it will have been set correctly, what I am hoping is to be able to
> use all the nice features of the DMPLEX object.
>
> Best regards,
> Nicolas
>
>
> Ce message et toutes les pièces jointes (ci-après le 'Message') sont
> établis à l'intention exclusive des destinataires et les informations qui y
> figurent sont strictement confidentielles. Toute utilisation de ce Message
> non conforme à sa destination, toute diffusion ou toute publication totale
> ou partielle, est interdite sauf autorisation expresse.
>
> Si vous n'êtes pas le destinataire de ce Message, il vous est interdit de
> le copier, de le faire suivre, de le divulguer ou d'en utiliser tout ou
> partie. Si vous avez reçu ce Message par erreur, merci de le supprimer de
> votre système, ainsi que toutes ses copies, et de n'en garder aucune trace
> sur quelque support que ce soit. Nous vous remercions également d'en
> avertir immédiatement l'expéditeur par retour du message.
>
> Il est impossible de garantir que les communications par messagerie
> électronique arrivent en temps utile, sont sécurisées ou dénuées de toute
> erreur ou virus.
> ____________________________________________________
>
> This message and any attachments (the 'Message') are intended solely for
> the addressees. The information contained in this Message is confidential.
> Any use of information contained in this Message not in accord with its
> purpose, any dissemination or disclosure, either whole or partial, is
> prohibited except formal approval.
>
> If you are not the addressee, you may not copy, forward, disclose or use
> any part of it. If you have received this message in error, please delete
> it and all copies from your system and notify the sender immediately by
> return message.
>
> E-mail communication cannot be guaranteed to be timely secure, error or
> virus-free.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20211212/1b045ff3/attachment-0001.html>