[Dune] Features of Ghost-Elements

[Andreas Dedner]

Do you mean a situation like this:
>    +--------+--------+
>    |        |        |
>    | I_2    | ghost  |
>    |        |        |
>    +--------+--------+
>    |        |        |
>    | I_1    |  I_0   |
>    |        |        |
>    +--------+--------+
>
> In this case
>
>   * Would I visit both copies of the ghost when iterating over the elements of
>     the gridview?
>
>    
ibegin() on both I_0 and I_1 would give you a ghost both with the
same geometry but with different index. So you have a G_0 and a
G_2 which are geometrically identical but topologically different.
ibegin on G_2 for example would give you only I_2.
The communication method works, i.e., the data from the corresponding
interior element would be communicated to both G_0 and G_2.

Best
Andreas

>   * Would gv.indexSet().index(ghost) yield the same index for both copies?
>
>   * When doing an Interior_All communication, would both copies of the ghost
>     receive data from the corresponding interior element of the other process?
>
> I'm probably OK, but just checking to be safe.
>
>    
>>                                                     Apart from that, everything
>> should work as expected and you should file a bug report, if ALU fails to comply
>> with one of your assumptions.
>>      
> That sounds great!
>
> Thanks,
> Jö.
>
>    
>
>
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