[petsc-users] Creating a DMNetwork from a DMPlex

[Smith, Barry F.]

  I am not sure you want DMNetwork, DMNetwork has no geometry; it only has vertices and edges. Vertices are connected to other vertices through the edges. For example I can't see how one would do vertex centered finite volume methods with DMNetwork. Maybe if you said something more about your planned discretization we could figure something out.

> On May 19, 2019, at 8:32 PM, Swarnava Ghosh <swarnava89 at gmail.com> wrote:
> 
> Hi Barry,
> 
> No, the gmesh file contains a mesh and not a graph/network.
> In that case, is it possible to create a DMNetwork first from the DMPlex and then distribute the DMNetwork.
> 
> I have this case, because I want a vertex partitioning of my mesh. Domain decomposition of DMPlex gives me cell partitioning. Essentially what I want is that no two processes can share a vertex BUT that can share an edge. Similar to how a DMDA is distributed.
> 
> Thanks,
> Swarnava
> 
> On Sun, May 19, 2019 at 4:50 PM Smith, Barry F. <bsmith at mcs.anl.gov> wrote:
> 
>    This use case never occurred to us. Is the gmesh file containing a graph/network (as opposed to a mesh)? There seem two choices
> 
> 1) if the gmesh file contains a graph/network one could write a gmesh reader for that case that reads directly for and constructs a DMNetwork or
> 
> 2) write a converter for a DMPlex to DMNetwork. 
> 
>    I lean toward the first
> 
>    Either way you need to understand the documentation for DMNetwork and how to build one up.
> 
> 
>    Barry
> 
> 
> > On May 19, 2019, at 6:34 PM, Swarnava Ghosh via petsc-users <petsc-users at mcs.anl.gov> wrote:
> > 
> > Hi Petsc users and developers,
> > 
> > I am trying to find a way of creating a DMNetwork from a DMPlex. I have read the DMPlex from a gmesh file and have it distributed.
> > 
> > Thanks,
> > SG
>