[petsc-users] Red-black block Jacobi in PETSc?

[Barry Smith]

  Ben,

   Please explain more what you mean by "a red-black block Jacobi smoother". What is your matrix structure? What are the blocks? How do you decide which ones are which color?  Why do you wish to use some a smoother.

  Barry

> On Aug 29, 2017, at 6:19 PM, Ben Yee <bcyee at umich.edu> wrote:
> 
> Hi,
> 
> For the smoother in PCMG, I want to use a red-black block Jacobi smoother.  Is this available with the existing PETSc options?  If so, how do I designate which blocks are red and which are black?
> 
> If it is not possible, what would be the best way to implement this?  Would I use KSPRICHARDSON+PCSHELL?
> 
> Thanks!
> 
> -- 
> Ben Yee
> 
> NERS PhD Candidate, University of Michigan
> B.S. Mech. & Nuclear Eng., U.C. Berkeley