[Dune] Reading arbitrary polygonal meshes in Dune

[Christian Engwer]

Hi,

currently no grid can handle such elements. Once upon a time there was
a simple implementation, which was able to handle arbitrary polygonal
elements in 2D with out refinement. But this doesn't work with the
current Dune anymore. On the other hand I believe it wouldn't be too
difficult to implement such a mesh, as we have introducent several
changes in the interface to allow for non-standard meshes (this was
all with the cornerpoint mesh in mind).

Ciao
Christian

On Thu, Feb 26, 2015 at 12:02:02PM +0000, Andreas Dedner wrote:
> Hi.
> The main problem is not the grid type or the factory but that you
> need an actual
> grid implementation that can handle these general meshes. ALU and
> SPGrid etc.
> can only handle cubes and simplex elements and that is the only
> geometry types
> they can understand in their GridFactory.
> 
> So for something more general you need to provide a new grid
> implementation that
> allows for more general grid types. The geometry type of these
> elements would be
> "none" and probably you would also be implementing only part of the
> geometry interface.
> Something along those lines was done in the CornerPointGrid implementation.
> https://github.com/OPM/dune-cornerpoint
> 
> Best
> Andreas
> 
> 
> 
> On 26/02/15 11:38, Ganesh Diwan wrote:
> >Dear list,
> >
> >I am working on implementing virtual element computations inside
> >Dune. This will involve implementing the algorithm on arbitrary
> >shaped elements. Is there a way to read arbitrary polygonal (2d)
> >or polyhedral (3d) meshes in Dune? Currently implemented Grid
> >managers (ALUGrid, SPGrid etc.) identify either simplices or cube
> >types.
> >
> >Can the GridFactory class be used for this purpose? Grid-howto
> >document says when building a new gridtype Dune may have a problem
> >for unidentified element type. Say, I have an element with five
> >edges (a pentagon). In this case, is Dune likely to throw an
> >exception for unidentified element type?
> >
> >I wanted to get the Grid guru's thoughts before investing time in this.
> >
> >Thank you!
> >Ganesh
> >
> >
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> 

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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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