[dune-pdelab] Periodic Boundary Conditions in Sequential

[Steffen Müthing]

Sorry, my mail program just threw a fit for some reason…

> Am 16.01.2017 um 13:27 schrieb Steffen Müthing <steffen.muething at iwr.uni-heidelberg.de>:
> 
> Hi Tim,
> 
>> Am 16.01.2017 um 13:06 schrieb Dodwell, Timothy <T.Dodwell at exeter.ac.uk>:
>> 
>> Dear All,
>> 
>> I have a post-doc modelling a 2D problem on a donut. We have implemented this in YaspGrid with Geometry Grid.
>> 
>> We clearly need to setup periodic boundary conditions.
>> 
>> I thought DUNE handled this much like parallel domain decomposition, so you have to set the overlap to one and tell the grid it is periodic (then that is it!)
> 
> yes, that’s how it’s done (at least with YaspGrid).
> 
>> 
>> From the look of our solutions the periodic boundary conditions have not been implemented correctly
>> 
>> -    Does YaspGrid ignore the overlap if you run it in sequential mode?
> 
> No, the overlap is there (but I’m not sure if you need to have Dune compiled with MPI support, there might be shortcuts in the
> code that prevent it from working correctly without MPI enabled).
> 
>> 
>> -    Do you have to write a constraint space for periodic boundary conditions in sequential (all the examples of this are assembled elementwise which is not what we want for periodic boundary conditions!)
> 
> You have to use OverlappingConformingDirichletsConstraints for this to work, otherwise the constraints assembler will not put
> any constraints on the periodic boundaries (which are recognized as processor boundaries in this case).
> 
> Steffen
> 
>> 
>> Any help would be great! Thanks in advance!
>> 
>> Tim
>> 
>> 
>> Dr Tim Dodwell
>> Senior Lecturer in Engineering Mathematics
>> Rm 221 - Harrison Building
>> College of Engineering, Mathematics & Physical Sciences
>> University of Exeter
>> Exeter
>> Devon
>> EX4 4PY
>> 
>> mail: t.dodwell(at)exeter.ac.uk
>> tel: +44 (0)1392 725899
>> mob: +44 (0)7745 622870
>> web: http://emps.exeter.ac.uk/engineering/staff/td336
>> Papers and Pre-prints: @Research-Gate
>> Citations: @Google-Scholar
>> 
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> 
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