[petsc-users] strange TS adaptivity behavior

[Mark Adams]

>
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> If you increase resolution at differentiating a discontinuity, you'd
> expect to become more and more confident that the error is large.
>

I am trying to use smooth functions but my first function might have had a
discontinuity. I'm now just using a sin function that is perfectly smooth.

In looking at this some more, the dynamics/stiffness of the system, when
these (cold) sources are added, is just stiff and this behavior seems
reasonable. I've found that with a dt-min of 0.1 and ts_tol 1.e-1 it works
OK and the results are the same in the eyeball norm as dt-min 1e-3 and
ts_tol 1.e-3. So I'm gonna call that converged.

Thanks,
Mark
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