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

[Oliver Sander]

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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