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

[Matthew Knepley]

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,
> TSIRK2C, TSIRK2D, TSIRK2E, TSIRK3, TSIRKL2,
>

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


>  I am not sure how to use them and if only Gaussian points can be used
> (Radau or Labatto may not offered).
>

There is currently only one IRK type, which is the Gauss method.


> 2.Maybe there is a similar option to implement the fully implicit
> Runge-Kutta methods in PETSc 3.15 or other previous versions? For example,
> if I want to solve a time dependent problem with a butcher table like
> below, do I need to input it by myself?
>
> Thank you very much for your help.
>

I do not understand your question. IRK is only present is 3.16

  Thanks,

      Matt


> Best regards,
> Wang Jing-Yuan
>


-- 
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

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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