I have a 3D Laplacian program that I wrote in matlab that I would like to transition to PETSc.
In my current program I have an inner cube which utilizes a 27 point uniform stencil surrounded by an outer cubical which uses a smaller stencil on a variable grid. I require the inner cubical to contain accurate results and do not care if error accumulates in the outer regions. Where can I learn about combining grids for PETSc implementation? Many Thanks John
