dolfin team mailing list archive

[Dag Lindbo <dag@xxxxxxxxxx>]

Anders Logg wrote:
> On Tue, Jun 17, 2008 at 10:52:06PM +0200, Dag Lindbo wrote:
>> Hello again!
>>
>> Is it correct that Periodic BCs won't work for vector-valued systems?
>> There is a comment to suggest this in PeriodicBC.cpp. Is there a
>> reasonable workaround for the needy?
>>
>> /Dag
> 
> I don't know of an easy workaround.
> 
> But maybe you can take a look at the code in PeriodicBC.cpp to see if
> it's possible to understand what it does and then extend it? I guess
> the extension will be nontrivial, but the code is fairly well
> documented so it should not be impossible.

Sorry for the basic question, but I'm struggling to figure out the role
SubSystems play in PeriodicBCs.

E.g. on a Taylor-Hood element, SubSystem(1) corresponds to pressure - a
scalar. I expected that it would be possible to apply the PBC to this
subsystem. But if I do
PeriodicBC bc(mesh, sub_domain, SubSystem(1)),
and try to apply it I still get an abort that there are "more than one
dof associated with coordinate. Did you forget to specify the subsystem?".

I would greatly appreciate if someone could help to clarify this.

/Dag

> 
> Otherwise, file a bug report.
> 
> 
> 
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