[petsc-users] How to refine the Vertex Sets in DMPlex

[Matthew Knepley]

On Tue, Jun 7, 2016 at 3:05 PM, Rongliang Chen <rl.chen at siat.ac.cn> wrote:

> Hi Matt,
>
> Thanks for your reply.
>
> Yes, I only labels the vertex because I am doing the finite element method
> where I only need the vertex label. Do you mean that I need to label the
> faces and get the vertex label from the  face label?
>

You need to label vertices and edges.

  Thanks,

    Matt


> Thanks,
> Rongliang
>
>
>
> On 06/07/2016 09:51 PM, Matthew Knepley wrote:
>
> On Tue, Jun 7, 2016 at 10:09 AM, Rongliang Chen <rl.chen at siat.ac.cn>
> wrote:
>
>> Dear All,
>>
>> I am using the DMRefine_Plex to refine a mesh. In the coarse mesh, it has
>> a label "Vertex Sets" to mark the boundary nodes. I found that the
>> DMRefine_Plex did not refine this label.
>>
>> For example, in the coarse mesh, there are 100 nodes on the boundary,
>> that is the number of nodes in the label is 100. In the refined mesh
>> (uniformly refined), the number of nodes in the label should be larger than
>> 100, but I found that this number is still 100, which means the newly added
>> nodes on the boundary were not added to the label.
>>
>> But I need a refined label to set the boundary conditions. Anyone can
>> tell me how to get a refined Vertex Sets label?
>>
>
> All operations are topological in Plex, not geometric. When we refine, we
> split edges (for instance) and the new vertex inserted
> inherits the labels from the edge that was split. I am guessing that you
> only labels the vertices.
>
>   Thanks,
>
>     Matt
>
>
>> Best regards,
>> Rongliang
>>
>>
>
>
> --
> 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
>
>
>


-- 
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
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