[Dune] do intersections need to match?

[Christian Engwer]

On Thu, Mar 05, 2015 at 06:14:00PM +0100, Aleksejs Fomins wrote:
> Dear Dune,
> 
> When a geometry of a face is requested as an intersection from two neighbouring elements, does the orientation of this face have to match? If yes, how is this orientation usually established in present grids.

face don't have to match, but intersections are unique. If the mesh is
conforming, the orientation of the faces, which co-incide with an
intersection, can have a different orientation than the other face and
than the intersection.

> 
> So far I was naively using ReferenceElement.subEntity(...) to find the indices of a face from the containing element, but, naturally, there is nothing to enforce that the faces generated this way would have the same orientation...
> 
> Regards,
> Aleksejs
> 
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-- 
Prof. Dr. Christian Engwer 
Institut für Numerische und Angewandte Mathematik
Fachbereich Mathematik und Informatik der Universität Münster
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