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

[Rongliang Chen]

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?

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 
> <mailto: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

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