On Tue, Apr 30, 2013 at 8:12 AM, Matthew Knepley <knepley at gmail.com> wrote:
> On Tue, Apr 30, 2013 at 2:57 AM, Dharmendar Reddy <dharmareddy84 at gmail.com > > wrote: > >> Hello, >> I have a doubt about how the node ordering in plex submesh is >> created. >> >> I create a oneD mesh along y-direction from a two dimensional square mesh >> in x-y direction. In the original mesh the nodes are indexed such that the >> count increase in y-direction first and then in x-direction. >> >> Consider a 5 by 5 square mesh >> >> Now the oneD subdm has 5 nodes and 4 cells >> >> if the coordinates of the nodes is [0,1.0,2.0,3.0,4.0] in x and y >> drection >> >> I see that cells in the subdm for x=1.0 have support: >> Vertex id here is the numbering with respect to subdm. >> >> cellId: vertexId ExpectedVertexId (or atleast i want this also >> this will be the >> case >> for x = 0.0) >> >> 0 5 4 4 5 >> 1 6 5 5 6 >> 2 7 6 6 7 >> 3 8 7 7 8 >> >> Of course this is consistent with the node ordering in original dm but i >> i use the coordinates of the nodes i get detJacobain negative. >> >> I am not sure if this make sense .... >> >> Should not (or can ) the nodes in the subdm be reoriented such that they >> all have positive orientation ? >> > > I am working all of this out now, which is why I have been slow in > replying. I have a code that uses > this call in every possible way, in all dimensions. I should be done this > week. > > You are correct that the orientation is likely off. That is what I am > checking. > Thanks...i am eagerly waiting for the updates...Hopefully I will graduate soon... J > > Thanks, > > Matt > > >> Since i am creating the subdm using indexset of a select points in >> original dm, i can see that the connectivity is preserved. >> >> Should i create a new dm using DMcreatefromCellList after fixing the >> orientations ? but then i need maps from this dm to orignal dm to access >> the dof values. >> >> Thanks >> Reddy >> -- >> ----------------------------------------------------- >> Dharmendar Reddy Palle >> Graduate Student >> Microelectronics Research center, >> University of Texas at Austin, >> 10100 Burnet Road, Bldg. 160 >> MER 2.608F, TX 78758-4445 >> e-mail: dharmareddy84 at gmail.com >> Phone: +1-512-350-9082 >> United States of America. >> Homepage: https://webspace.utexas.edu/~dpr342 >> > > > > -- > 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 > -- ----------------------------------------------------- Dharmendar Reddy Palle Graduate Student Microelectronics Research center, University of Texas at Austin, 10100 Burnet Road, Bldg. 160 MER 2.608F, TX 78758-4445 e-mail: dharmareddy84 at gmail.com Phone: +1-512-350-9082 United States of America. Homepage: https://webspace.utexas.edu/~dpr342 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130430/45f5c01d/attachment.html>
