[petsc-users] Solving hollow matrices

[Lucas Clemente Vella]

What PETSc setting of KSP and PC can be used to solve a linear system with
matrix with null elements on the main diagonal? Such matrices arise on
monolithic methods of solving Navier-Stokes equation.

I understand it doesn't matter for the KSP method, right?

I know that for lots of PC methods it won't work, like Jacobi or SOR. Is
there any PC that can handle such matrices?

For PC method that can't handle hollow matrices, are there any kind of
treatment provided by PETSc that can be done to the linear system to
ensure  the matrix will have only non-null elements on the main diagonal?
Maybe some kind of matrix reordering?

-- 
Lucas Clemente Vella
lvella at gmail.com
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