[petsc-dev] question about time integrators, TS

Matthew Knepley knepley at gmail.com
Wed Aug 3 15:11:36 CDT 2016

On Wed, Aug 3, 2016 at 2:59 PM, Mark Adams <mfadams at lbl.gov> wrote:

> We have a question about the RHS Jacobian (G) for TS.  The manual says:
> • Jacobian Gu
> If using a fully implicit method and the function G() is provided, one
> also can provide an appropriate (approximate) Jacobian matrix of G().
> If we use, say, backward Euler and provide a G Jacobian, does PETSc
> use this G Jacobian in some way? or is the G Jacobian only used for
> IMEX methods?

It should definitely work with BEuler. However, I have not personally
tested it.
That is one thing that will get setup this fall. I will have Plex examples
that test
all these options.


> Mark

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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