[Dune] CurvilinearGridAPI: Implementation of EntityTags and BoundaryIterators

[Aleksejs Fomins]

Dear All,

Thank you for your replies. I will read through the PersistentContainer
and get back to you.

Oliver, You only ever need to attach 1 integer to each element to
represent physical property. Since there are finite number of elements
in the mesh, they have finite number of material properties which will
be stored whichever way the user chooses in the derived code.

Rob, I already know how to implement this iterator, there is no problem
with that. I was only asking on what would people find more convenient
to use. And I disagree that in general looping over elements and
boundaries is not much different, there is N^{2/3} less of the latter
than the former, for very large tasks this can become significant.

Cheers,
Aleksejs


On 12/18/2014 03:33 PM, Oliver Sander wrote:
> Am 18.12.2014 um 15:24 schrieb Christoph Grüninger:
>> Hi!
>>
>>> I agree with both feature request but I can tell you right away that at
>>> least with respect to the material property you will not find much
>>> support. We had a method like that for a boundary id but that was now
>>> removed.
>>
>> We have this use case, too. We want to read grids with attached
>> permeabilities to its cells. In principle we would like to have such a
>> feature.
> 
> So what type would you like to attach to each element?  A double?  Or rather
> a full 3x3 matrix, because permeabilities are tensors after all?  Or an
> enum?  What would the values of that enum be?
> 
>>
>> The boundary ID issues was more complex, if I remember correctly. It was
>> removed as some questioned that the feature was properly
>> documented/defined/described.
> 
> This was an additional objection.
> 
>>
>> Oliver answered Aleksejs should "expect quite a bit of opposition to
>> it." I am wondering, who is this opposition?
> 
> Me, to say the least.
> 
> :-)
> Oliver
> 
>  Maybe we should make a
>> non-decisive move to get a insight in the general opinion?
>>
>> Best
>> Christoph
>>
> 
> 
> 
> 
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