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

[Rongliang Chen]

Hi Matt,

I know how to label vertex (ex_get_node_set) and face (ex_get_side_set), 
but do not know how to label the edge for a 3D mesh. Can you give me an 
example for that?

Thanks,
Rongliang

---------------------
Rongliang Chen,   PhD
Associate Professor

Laboratory for Engineering and Scientific Computing
Shenzhen Institutes of Advanced Technology
Chinese Academy of Sciences
Address: 1068 Xueyuan Avenue, Shenzhen University Town, Shenzhen, Guangdong (518055), P. R. China
E-mail:  rl.chen at siat.ac.cn
Phone: +86-755-86392312

On 06/07/2016 10:06 PM, Matthew Knepley wrote:
> On Tue, Jun 7, 2016 at 3:05 PM, Rongliang Chen <rl.chen at siat.ac.cn 
> <mailto: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 <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
>
>
>
>
> -- 
> 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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