[petsc-users] Any TSGL examples, or higher order BDFs?

[Jed Brown]

Mark Lohry <mlohry at princeton.edu> writes:

> I'd like to use a 3rd+ order BDF with TS, which appears to only have 1st 
> order (backward euler/TSBEULER), and then the bindings to SUNDIALS. 

What about TSARKIMEX, TSROSW, and TSEIMEX?  These are really the methods
we recommend.

> I'd like to avoid SUNDIALS as it looks like it forces the use of it's
> own non-linear solvers.

Yeah.

> Am I correct in thinking the preferred way to construct a BDF with TS is 
> to use TSGL? Are there any examples of TSGL in use? I'm not seeing any 
> in the docs.

You can use -ts_type gl, but I haven't worked with those methods in a
long time and they have not been robust in practice.  I recommend using
ROSW as a default.
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