[Dune] parallel DUNE grid for implementing a spherical shell (UGGrid)

[Oliver Sander]

Hi Eike,
as mentioned, this is a hardly tested feature.  Can you send me an 
updated test
program?  Did you find any rule (besides RED) that does anything?
best,
Oliver

Am 05.11.2012 20:14, schrieb Eike Mueller:
> Hi Oliver,
>
> thanks a lot, I think that's what I was looking for. I've now tried 
> the following RefinementRules, but with little success:
>
> RED: I get the previous refinement in all three directions
> BLUE, COARSE: Nothing happens, i.e. elements do not get refined
>
> For
>
> HEX_BISECT_0_1,
> HEX_BISECT_0_2,
> HEX_BISECT_0_3,
> HEX_TRISECT_0,
> HEX_TRISECT_5,
> HEX_QUADSECT_0,
> HEX_QUADSECT_1,
> HEX_QUADSECT_2
>
> I always get the following runtime error:
>
> ERROR in Patterns2Rules: no mapping for HEXAHEDRON and this pattern!
> uggrid: rm.c:2838: UG::INT UG::D3::Patterns2Rules(UG::D3::ELEMENT*, 
> UG::INT): Assertion `0' failed.
>
> so I must still be missing something. I loop over the grid like this:
>
> for (ElementLeafIterator it = ibegin;it!=iend;++it) {
>       grid.mark(*it,UG::D3::PRISM_QUADSECT,0);
> }
>
> Eike
>
> On 5 Nov 2012, at 17:01, Oliver Sander wrote:
>
>>
>>
>> Hi Eike,
>>
>> Am 05.11.2012 17:45, schrieb Eike Mueller:
>>> Dear dune-list,
>>>
>>> (1) How can I ensure that the grid is not refined in the radial direction, i.e. I always only end up with one layer of cells in the radial direction? I guess I have to run over the grid and mark cells for refinement, but is this documented anywhere in more detail?
>> UGGrid has a special non-interface method for anisotropic 
>> refinement.  Have a look
>> at the doxygen documentation of the UGGrid class.  There is a method
>>
>> bool mark 
>> <imap://sander@indy5.igpm.rwth-aachen.de:143/fetch%3EUID%3E.INBOX.Sent%3E209?part=1.2.2&filename=a00865.html> 
>> (const typename Traits::template Codim 
>> <imap://sander@indy5.igpm.rwth-aachen.de:143/fetch%3EUID%3E.INBOX.Sent%3E209?part=1.2.3&filename=a00218.html>< 
>> 0 >::Entity 
>> <imap://sander@indy5.igpm.rwth-aachen.de:143/fetch%3EUID%3E.INBOX.Sent%3E209?part=1.2.4&filename=a00362.html> 
>> &e, typename UG_NS< dim >::RefinementRule rule, int side=0)
>>
>> which marks the entity 'e' for refinement, but with a special 
>> refinement rule.
>> The list of rules is UG-specific and has not been properly documented 
>> (Freiwillige vor!).
>> You find all possible enum values in the UG header ug/gm.h at line 317ff
>> They are reasonably self-explanatory, but you need to do some 
>> experimenting.
>>
>>> (2) The parallel load balancing does not seem to work. If I run on 24 processes and I call globalRefine(), followed by loadBalance(), some processes end up with no part of the grid. I have checked that I use the parallel version of UG grid.
>>>
>>> I attach the code I used to generate the grid, as well as the .vtu files mentioned above.
>> No clue, I'd have to try this out myself.
>> cheers,
>> Oliver
>>
>>> Thanks a lot for any help,
>>>
>>> Eike
>>>
>>> PS: Alternatively, I would also be equaully happy if I can create a PARALLEL 2d surface grid for the surface of the sphere (again, either cubed sphere or a icosahedral grid). However, as far as I can see it, there is no parallel implementation for this, we've tried 2d ALUGRID, parallelised with the metagrid approach, but this does not scale beyond a few hundred processors as the entire grid is stored on each processor and my code runs out of memory.
>>>
>>>
>>>
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>>
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