[petsc-users] different dof in DMDA creating

[Matthew Knepley]

On Thu, Aug 15, 2019 at 12:18 PM Danyang Su <danyang.su at gmail.com> wrote:

> Hi Barry and Matt,
>
> Would you please give me some advice on the functions I need to use to
> set different dof to the specified nodes. For now, I use
> DMPlexCreateSection that dof is uniform throughout the domain. I am a
> bit lost in choosing the right DMPlex functions, unfortunately.
>

Chapter 10 of the PETSc User Manual discusses low-level data layout using
Section. How about we start
there and then clarify anything that is confusing.

  Thanks,

    Matt


> Thanks and regards,
>
> Danyang
>
> On 2019-02-07 1:53 p.m., Danyang Su wrote:
> > Thanks, Barry. DMPlex also works for my code.
> >
> > Danyang
> >
> > On 2019-02-07 1:14 p.m., Smith, Barry F. wrote:
> >>    No, you would need to use the more flexible DMPlex
> >>
> >>
> >>> On Feb 7, 2019, at 3:04 PM, Danyang Su via petsc-users
> >>> <petsc-users at mcs.anl.gov> wrote:
> >>>
> >>> Dear PETSc Users,
> >>>
> >>> Does DMDA support different number of degrees of freedom for
> >>> different node? For example I have a 2D subsurface flow problem with
> >>> the default dof = 1 throughout the domain. Now I want to add some
> >>> sparse fractures in the domain. For the nodes connected to the
> >>> sparse fractures, I want to set dof to 2. Is it possible to set dof
> >>> to 2 for those nodes only?
> >>>
> >>> Thanks,
> >>>
> >>> Danyang
> >>>
>


-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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