[petsc-users] DMDA stencil for union jack triangular meshes

[Thomas Witkowski]

I'm about to implement the multigrid preconditioner for my FEM code  
for the case of regulare 2D triangular meshes. My meshes have a union  
jack pattern, thus the nodes are equidistributed in both directions  
but the stencil varies between a 9-point and a 5-point stencil. Is it  
possible to fit this into the DMDA framework?

Thomas