[petsc-users] how to speed up convergence?

[Konstantinos Kontzialis]

On 11/10/2011 06:43 PM, petsc-users-request at mcs.anl.gov wrote:
> how to speed up convergence?

Dear Matt and Jed,

1. I use the conservative variables.

2. No limiter.

3. Boundary conditions are weakly imposed (to solve the riemann problem).

4. mat_fd_type ds is worse for the current case

5. sub_pc_type lu did a better work but not to a satisfactory level

6. MATCOLORINGSL is used.

For the preconditioner I need to do some changes.

Please help me first to understand the coloring types in order to choose 
the best one (any web pages, links etc.?).

Thank you,

Kostas