[Dune] Topological changes in the grid

[Uli Sack]

Hi Andrea!
Without having fully understood what you need/want, I would direct your 
attention to dune-subgrid
http://numerik.mi.fu-berlin.de/dune-subgrid/index.php

There you should be able to mark any set of elements of a host grid to 
represent your computational grid - ie. disconnected sets are possible 
afaik. The subgrid object may be changed subsequently to any other set 
of hostgrid elements. Data interpolation to the new subgrid may be done 
by means of the hostgrid.

Maybe this helps in some way.

Uli