[aspect-devel] periodic domains

[Wolfgang Bangerth]

> Ian Rose added support for this in Aspect (thanks!). There is an
> example in cookbooks/ that shows how to use it.

Nice!

The way this is currently done can only work for Cartesian boxes because (i) 
the GeometryModel::Interface::get_periodic_boundary_pairs() function returns 
something that deals with Cartesian directions, and (ii) in core.cc we now 
call the version of DoFTools::make_periodicity_constraints() that expects 
this. This way, we can not deal with periodic boundary conditions on, for 
example, the sides of a quarter 2d hyper shell.

Would it make sense to change the interface of get_periodic_boundary_pairs() 
so that it returns the output of GridTools::identify_periodic_face_pairs() and 
then in core.cc just call the other version of 
DoFTools::make_periodicity_constraints()?

Best
  W.

-- 
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Wolfgang Bangerth               email:            bangerth at math.tamu.edu
                                 www: http://www.math.tamu.edu/~bangerth/