[petsc-dev] petsc-dev Digest, Vol 154, Issue 7

Tue Oct 5 13:47:59 CDT 2021

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 <petsc-dev-request at mcs.anl.gov> wrote:

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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)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 5 Oct 2021 03:56:48 +0000
> From: Wang Jingyuan <mc05569 at connect.um.edu.mo>
> To: "petsc-dev at mcs.anl.gov" <petsc-dev at mcs.anl.gov>
> Subject: [petsc-dev] Question about the fully implicit Runge-Kutta
>         methods (TS)
> Message-ID: <3CE2CAF7-35EC-44E9-AE78-856BEF270AA2 at 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 at gmail.com>
> To: Wang Jingyuan <mc05569 at connect.um.edu.mo>
> Cc: "petsc-dev at mcs.anl.gov" <petsc-dev at mcs.anl.gov>
> Subject: Re: [petsc-dev] Question about the fully implicit Runge-Kutta
>         methods (TS)
> Message-ID:
>         <
> CAMYG4GkKpmJ1mA5DMSsYcjHSJ_5PKisZ0u78WbjQbxTh_v+SOg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 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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> End of petsc-dev Digest, Vol 154, Issue 7
> *****************************************
>

-- 
Ed Bueler
Dept of Mathematics and Statistics
University of Alaska Fairbanks
Fairbanks, AK 99775-6660
306C Chapman
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