[Dune] Topological changes in the grid

[Oliver Sander]

Hi Andrea,
there is no way to change the connectivity of any Dune grid 
implementation that
I know.  Not even a dirty trick.  You need to kill your grid object 
within the time loop
and create a new one using the grid factory.  That by itself is 
reasonably straightforward.
The problem of course is how to transfer your data from the old to the 
new grid.
But the solution to that is problem-specific.
good luck,
Oliver

Am 19.02.2013 19:01, schrieb Sacconi, Andrea:
> Hi everyone,
>
> I'd like to ask you a question about the grid.
>
> Suppose you are solving a problem on a given initial grid, and after a 
> while some topological changes take place (coalescence, breakups, 
> ...). For example, from one connected domain you get two, smaller 
> disconnected ones.
> Suppose in addition that you have a software that removes tangles, 
> returning the actual disconnected domain without self-intersections.
>
> I know that a grid can be neither created nor modified; so basically 
> you can only have a reference to a grid, initialised by dereferencing 
> a pointer to the the same grid type.
> So, if all the objects (function spaces, grid functions, ...) I have 
> in my algorithm are defined over the initial one, is there a tricky 
> way to continue my computations on the new disconnected domain?
>
> I mean, the new tangle-free grid is returned inside a time loop.
> I have initialised a new pointer to the same grid type by using a grid 
> factory (since the new disconnected domain is returned through its 
> connectivity, I insert vertices and elements by hand). However, I 
> can't assign it to the reference to the old grid ... Please tell me 
> that there is a (dirty) workaround to continue the computations inside 
> the time loop ........... otherwise I wouldn't know how to proceed 
> without breaking the loop ........
>
> Cheers,
> Andrea
>
> __________________________________________________________
>
> Andrea Sacconi
> PhD student, Applied Mathematics
> AMMP Section, Department of Mathematics, Imperial College London,
> London SW7 2AZ, UK
> a.sacconi11 at imperial.ac.uk
>
>
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