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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)
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Message: 1
Date: Tue, 5 Oct 2021 03:56:48 +0000
From: Wang Jingyuan <mc05569@connect.um.edu.mo>
To: "petsc-dev@mcs.anl.gov" <petsc-dev@mcs.anl.gov>
Subject: [petsc-dev] Question about the fully implicit Runge-Kutta
methods (TS)
Message-ID: <3CE2CAF7-35EC-44E9-AE78-856BEF270AA2@connect.umac.mo>
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
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Message: 2
Date: Tue, 5 Oct 2021 06:43:02 -0400
From: Matthew Knepley <knepley@gmail.com>
To: Wang Jingyuan <mc05569@connect.um.edu.mo>
Cc: "petsc-dev@mcs.anl.gov" <petsc-dev@mcs.anl.gov>
Subject: Re: [petsc-dev] Question about the fully implicit Runge-Kutta
methods (TS)
Message-ID:
<CAMYG4GkKpmJ1mA5DMSsYcjHSJ_5PKisZ0u78WbjQbxTh_v+SOg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On Tue, Oct 5, 2021 at 12:42 AM Wang Jingyuan <mc05569@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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