[petsc-users] Discretized fields at quadrature points

[Sander Arens]

Or perhaps there should be a flag for PETSCDUALSPACELAGRANGE to evaluate at
the quadrature points?

On 8 April 2016 at 17:35, Sander Arens <Sander.Arens at ugent.be> wrote:

> What does it stand for? Discrete Gauss? Maybe PETSCSPACEQUADRATURE is a
> better name?
>
> The reason I want to use this is because these fields will be representing
> a bunch of ODE's at each point (not coupled spatially) and it would be nice
> if their mass matrices would be diagonal. So the dual space should be Dirac
> delta's at the quadrature points and that's different from the default
> (Lagrange).
>
> I'll see if I can code something up for this. Any suggestions for a name
> for this dual space?
>
> Thanks,
> Sander
>
> On 8 April 2016 at 16:48, Matthew Knepley <knepley at gmail.com> wrote:
>
>> On Wed, Apr 6, 2016 at 2:06 PM, Sander Arens <Sander.Arens at ugent.be>
>> wrote:
>>
>>> Hi,
>>>
>>> I'd like to be able to represent some discretized fields at the
>>> quadrature points of a finite element, so I can easily use them with the
>>> plex residual/function evaluations. Is it possible to do this with
>>> PetscFECreateDefault and some command line options?
>>> I think what I need is PETSCSPACEDG for the space, but I'm not sure what
>>> type I should take for the dual space?
>>>
>>
>> This is why I put that in there. It really should not be named DG, but
>> there are reasons I thought it made sense.
>>
>> I had not thought about a dual space, since I was not going to project
>> into it. I think you can just use whatever is the default.
>>
>>   Matt
>>
>>
>>> Thanks,
>>> Sander
>>>
>> --
>> What most experimenters take for granted before they begin their
>> experiments is infinitely more interesting than any results to which their
>> experiments lead.
>> -- Norbert Wiener
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20160408/0024ff51/attachment.html>