dolfin team mailing list archive

[Dag Lindbo <dag@xxxxxxxxxx>]

Anders Logg wrote:
> On Mon, Jun 30, 2008 at 11:44:40AM +0200, Dag Lindbo wrote:
>> 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
> 
> Is this still an issue?
> 

Yes, I have not been able to make more sense of this. Sorry. /Dag

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