[Dune] Gmsh reader crashes when using the grid factory read for ALUSimpleGRid<3, 3> with boundary id

[Andreas Dedner]

Hi,

I agree that gmsh support for ALU would be nice - but it is not so much 
an ALU problem as a gmsh reader problem IMO.
Thus I would say that the flyspray task was not critical bug in ALU but 
more a feature request for the gmsh reader :-) But since the boundary
insertion method are not standard this might be difficult to add
to the gmsh reader at the moment.

The problem with the misleading documentation is in
fact that the method is available on the interface class with a default
implementation (a DUNE_THROW). The method is then not overloaded in
the alugrid factory and thus not only inherits the method but also
its documentation. As I already said, the interface methods for 
inserting boundaries has not been fixed yet.

Do you actually need boundary ids? If so I think the gmsh reader does
not support these (as far as I know).

Best Andreas


Oswald Benedikt wrote:
> Hi ALU Developers, I am mildly suprised about your comments.
> 
> Wouldn't it be good to provide different methods for mesh input into ALUGrid quite soon,
> particularly when there is a need from users ?
> 
> This is not about deprecating DGF, by the way, be assured!
> 
> I might add that, here, we use probably dozens of grids that we created in GMSH
> and then, with some effort, convert into the DGF format, which we still plan rto use intensively.
> 
> Anyway, the documentation of Dune::GridFactory< ALUSimplexGrid< 3, 3 > > Class Template Reference
> (http://www.dune-project.org/doc/doxygen/dune-grid-html/classDune_1_1GridFactory_3_01ALUSimplexGrid_3_013_00_013_01_4_01_4.html#_details)
> says that the method virtual void
> 
> "insertBoundarySegment (const std::vector< unsigned int > vertices, const BoundarySegment< dimension, dimworld > *boundarySegment)
>  	Method to insert an arbitrarily shaped boundary segment into a coarse grid. "
> 
> is here. 
> 
> That is the source of my quite convinced feeling that it should be available.
> 
> 
> More, or even most, importantly, reading large meshes from the DGF format, may not be ultra-fast after all.
> 
> When I say large, I mean 10^5 or more tetrahedral elements. This is the size of the meshes that we have to cope
> with here when running electromagnetic simulations and I think for ALUGrid to be relevant in the future
> it must address users's needs.
> 
> After all, I have always believed that DUNE and its external libraries are
> a great achievement, meant to be capable of solving today's and tomorrow's large problems.
> 
> 
> Have a great day! Benedikt
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>> S#624 - [Dune] Gmsh reader crashes when using the grid factory read for ALUSimpleGRid<3, 3> with boundary id
>> User who did this - Robert Klöfkorn (robertk)
> 
>> ----------
>> This feature is not supported yet. I don't know you got the feeling that it is implemented. There will be an anouncement on the mailing list when the gmsh boundary ids are supported. Until then: DON'T USE IT !!! 
> 
> 
> 
> 
> ------------------------------------------------------------------------------------------------------------------
> Benedikt Oswald, Dr. sc. techn., dipl. El. Ing. ETH, www.psi.ch, Computational Accelerator Scientist
> Paul Scherrer  Institute (PSI), CH-5232 Villigen, Suisse, benedikt.oswald at psi.ch, +41(0)56 310 32 12
> "Passion is required for any great work, and for the Revolution passion and audacity are required in big doses.", 
> Ernesto 'Che' Guevara, Letter to his parents.
> http://maxwell.psi.ch/amaswiki/index.php/User:BenediktOswald 
> ------------------------------------------------------------------------------------------------------------------
> 
> 
> 
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