Hi,
I'm solving a multi-component problem in MatrixFree framework,
preconditioned by geometric multigrid. The code runs good for several cases
except one (with different geometry and boundary condition). The error is
"Iterative method reported convergence failure in step 0.
The residual in the last step was nan".
It's strange that the iteration breaks at step 0. If I try right
preconditioning, it breaks at step 1 with nan. Besides, if there is only on
multigrid level, the problem is solved correctly with 1 iteration, so
matrices should be correct. The coarse solution is good enough for
smoothing.
The question is, in which case may a CG or GMRES solver breaks at step 0
with nan?
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