[Dune] boundaryIndex on coarse grid

[Oliver Sander]

I agree with Andreas!  A BoundarySegment corresponds to the face
of a coarse grid element.

--
Oliver

Andreas Dedner schrieb:
>  From the view of the GridFactories I thoght that a boundary segment
> can only have one element? Or in other words to each boundary segment
> there is a unique interior level 0 codimension 0 entity which returns
> this boundary segment as intersection. At least in ALU or Alberta 
> calling insertBoundarySegment with something that spans more than one
> Entity<0> would lead to an error.
> Andreas
>
> Christian Engwer wrote:
>   
>> On Mon, Jan 18, 2010 at 09:59:24AM +0100, Andreas Dedner wrote:
>>     
>>> Hi,
>>> I thought that each level 0 boundary segment should have a unique
>>> index.
>>> Andreas
>>>       
>> Yes, the segments should have a unique index, but it is not stated,
>> that you can only have one element per segment.
>>
>> Christian
>>
>>     
>>> Christian Engwer wrote:
>>>       
>>>> While updating the strcutured grids, I was wondering about a small
>>>> detail in the boundaryIndex interface.
>>>>
>>>> The meeting minutes state:
>>>>
>>>> The user must be able to attach boundary information to the level-0
>>>> boundaries.
>>>>    1. Up to now the boundaryIDs allowed to associate an int with a
>>>> 	  boundary segament.
>>>>    2. The new proposal is to have an index with a boundary index. This
>>>> 	  is (more) consistent with the other indicies and allows to
>>>> 	  associate more or less any data with boundaries. The number
>>>> 	  would be inherited from the coarse grid.
>>>>
>>>> It does not say anything about the number of indices on the coarse
>>>> grid. I also thought, that that was the purpose of the
>>>> numBoundarySegments method.
>>>>
>>>> These descriptions especillay allow to have a boundary segment that
>>>> covers several coarse grid element, like the whole left side on a
>>>> strcutures grid. The gridcheck on the other hand complains.
>>>>
>>>> So my question now is.
>>>>
>>>> * What is the desired feature. Do we allow "multielement"-segments?
>>>>
>>>> Christian
>>>>
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>
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-- 
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* Oliver Sander                ** email: sander at mi.fu-berlin.de        *
* Freie Universität Berlin     ** phone: + 49 (30) 838 75348           *
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