[petsc-dev] Question about the fully implicit Runge-Kutta methods (TS)

Jed Brown jed at jedbrown.org
Tue Oct 5 13:57:18 CDT 2021

Matthew Knepley <knepley at gmail.com> writes:

> On Tue, Oct 5, 2021 at 12:42 AM Wang Jingyuan <mc05569 at connect.um.edu.mo>
> wrote:
>> Dear Sir or Madam,
>> I am a student of the University of Macau, I am trying to learn PETSc and
>> I have two questions about the TSIRK.
>> 1.PETSc 3.16.0 adds “irk" for the TSType and it offers many options like TSIRK1BEE,
> The types you mention above do not exist. For instance, the first one
> "TSIRK1BEE" is actually
> https://petsc.org/main/docs/manualpages/TS/TSARKIMEX1BEE.html

As Ed Bueler has commented, these non-existent types are incorrectly listed in the man page (people like me missed those copy/paste remnants during code review).


The 1BEE and related types are diagonally implicit, so don't make sense under TSIRK. We would like to add Radau and Lobatto methods to PETSc -- it would be a relatively easy contribution.

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