The types listed by Wang Jing-Yuan are mentioned on https://petsc.org/main/docs/manualpages/TS/TSIRK.html So maybe they do exist, but I haven't tried them. TSARKIMEX are a better-tested alternative? Ed On Tue, Oct 5, 2021 at 2:44 AM <[email protected]> wrote:

Send petsc-dev mailing list submissions to [email protected]

To subscribe or unsubscribe via the World Wide Web, visit https://lists.mcs.anl.gov/mailman/listinfo/petsc-dev or, via email, send a message with subject or body 'help' to [email protected]

You can reach the person managing the list at [email protected]

When replying, please edit your Subject line so it is more specific than "Re: Contents of petsc-dev digest..."

Today's Topics:

1. Question about the fully implicit Runge-Kutta methods (TS) (Wang Jingyuan) 2. Re: Question about the fully implicit Runge-Kutta methods (TS) (Matthew Knepley)

----------------------------------------------------------------------

Message: 1 Date: Tue, 5 Oct 2021 03:56:48 +0000 From: Wang Jingyuan <[email protected]> To: "[email protected]" <[email protected]> Subject: [petsc-dev] Question about the fully implicit Runge-Kutta methods (TS) Message-ID: <[email protected]> Content-Type: text/plain; charset="utf-8"

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

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? [cid:CF3DAFB6-6115-45C2-BEE4-0ADCA66709BB]

Thank you very much for your help.

Best regards, Wang Jing-Yuan