[petsc-users] GMRES solver

[Jed Brown]

On Sun, Jan 8, 2012 at 20:28, Mohamad M. Nasr-Azadani <mmnasr at gmail.com>wrote:

> Maybe I was not 100% clear, the way that I dealt with the nullspace was to
> set the pressure to zero at one node in the entire domain.


Well, this pollutes the spectrum, although most preconditioners fix it. We
recommend using KSPSetNullSpace() instead.
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