[petsc-dev] question about time integrators, TS

[Jed Brown]

Mark Adams <mfadams at lbl.gov> writes:

> 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?

IMEX methods typically do not use the RHS Jacobian, but fully implicit
methods will move it over to the left hand side in order to be implicit.
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