[petsc-users] Increasing norm with finer mesh

[Weizhuo Wang]

Hi!

I'm recently trying out the example code provided with the KSP solver
(ex12.c). I noticed that the mean norm of the grid increases as I use finer
meshes. For example, the mean norm is 5.72e-8 at m=10 n=10. However at
m=100, n=100, mean norm increases to 9.55e-6. This seems counter intuitive,
since most of the time error should decreases when using finer grid. Am I
doing this wrong?

Thanks!
-- 
Wang Weizhuo
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20181001/5dd38fb8/attachment.html>