Konstantinos Kontzialis <ckontzialis at lycos.com> writes: > Dear all, > > I am using asm as a preconditioner for solving the Navier Stokes > equations. When using ILU as the subdomain preconditioner, I notice > convergence problems in the partition boundaries.
I.e., it converges slowly there? That is natural because the preconditioner is more accurate in the interior of subdomains. > This does not happen with the Jacobi preconditioner. Naturally, because Jacobi is identical regardless of the partition. > Do I need to provide any connectivity, node mapping, and/or overlap > information to Petsc before calling KSPsolve? No, the matrix is enough.
