[Dune] CurvilinearGridAPI: Implementation of EntityTags and BoundaryIterators

[Oliver Sander]

Am 18.12.2014 um 15:45 schrieb 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.

So what if you have more than one property per element, say in a multi-physics
application?  Will you multiplex all properties into the single integer,
or request that more integers be added to the grid interface?
--
Oliver

> 
> 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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> 
> 
> 
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