<div dir="ltr">The types listed by Wang Jing-Yuan are mentioned on<div><br></div><div><a href="https://petsc.org/main/docs/manualpages/TS/TSIRK.html">https://petsc.org/main/docs/manualpages/TS/TSIRK.html</a><br></div><div><br></div><div>So maybe they do exist, but I haven't tried them. TSARKIMEX are a better-tested alternative?</div><div><br></div><div>Ed</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 5, 2021 at 2:44 AM <<a href="mailto:petsc-dev-request@mcs.anl.gov">petsc-dev-request@mcs.anl.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send petsc-dev mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Question about the fully implicit Runge-Kutta methods (TS)<br>
(Wang Jingyuan)<br>
2. Re: Question about the fully implicit Runge-Kutta methods<br>
(TS) (Matthew Knepley)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Tue, 5 Oct 2021 03:56:48 +0000<br>
From: Wang Jingyuan <<a href="mailto:mc05569@connect.um.edu.mo" target="_blank">mc05569@connect.um.edu.mo</a>><br>
To: "<a href="mailto:petsc-dev@mcs.anl.gov" target="_blank">petsc-dev@mcs.anl.gov</a>" <<a href="mailto:petsc-dev@mcs.anl.gov" target="_blank">petsc-dev@mcs.anl.gov</a>><br>
Subject: [petsc-dev] Question about the fully implicit Runge-Kutta<br>
methods (TS)<br>
Message-ID: <<a href="mailto:3CE2CAF7-35EC-44E9-AE78-856BEF270AA2@connect.umac.mo" target="_blank">3CE2CAF7-35EC-44E9-AE78-856BEF270AA2@connect.umac.mo</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Dear Sir or Madam,<br>
<br>
I am a student of the University of Macau, I am trying to learn PETSc and I have two questions about the TSIRK.<br>
<br>
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).<br>
<br>
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?<br>
[cid:CF3DAFB6-6115-45C2-BEE4-0ADCA66709BB]<br>
<br>
Thank you very much for your help.<br>
<br>
Best regards,<br>
Wang Jing-Yuan<br>
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Message: 2<br>
Date: Tue, 5 Oct 2021 06:43:02 -0400<br>
From: Matthew Knepley <<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>><br>
To: Wang Jingyuan <<a href="mailto:mc05569@connect.um.edu.mo" target="_blank">mc05569@connect.um.edu.mo</a>><br>
Cc: "<a href="mailto:petsc-dev@mcs.anl.gov" target="_blank">petsc-dev@mcs.anl.gov</a>" <<a href="mailto:petsc-dev@mcs.anl.gov" target="_blank">petsc-dev@mcs.anl.gov</a>><br>
Subject: Re: [petsc-dev] Question about the fully implicit Runge-Kutta<br>
methods (TS)<br>
Message-ID:<br>
<<a href="mailto:CAMYG4GkKpmJ1mA5DMSsYcjHSJ_5PKisZ0u78WbjQbxTh_v%2BSOg@mail.gmail.com" target="_blank">CAMYG4GkKpmJ1mA5DMSsYcjHSJ_5PKisZ0u78WbjQbxTh_v+SOg@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
On Tue, Oct 5, 2021 at 12:42 AM Wang Jingyuan <<a href="mailto:mc05569@connect.um.edu.mo" target="_blank">mc05569@connect.um.edu.mo</a>><br>
wrote:<br>
<br>
> Dear Sir or Madam,<br>
><br>
> I am a student of the University of Macau, I am trying to learn PETSc and<br>
> I have two questions about the TSIRK.<br>
><br>
> 1.PETSc 3.16.0 adds ?irk" for the TSType and it offers many options like TSIRK1BEE,<br>
> TSIRK2C, TSIRK2D, TSIRK2E, TSIRK3, TSIRKL2,<br>
><br>
<br>
The types you mention above do not exist. For instance, the first one<br>
"TSIRK1BEE" is actually<br>
<a href="https://petsc.org/main/docs/manualpages/TS/TSARKIMEX1BEE.html" rel="noreferrer" target="_blank">https://petsc.org/main/docs/manualpages/TS/TSARKIMEX1BEE.html</a><br>
<br>
<br>
> I am not sure how to use them and if only Gaussian points can be used<br>
> (Radau or Labatto may not offered).<br>
><br>
<br>
There is currently only one IRK type, which is the Gauss method.<br>
<br>
<br>
> 2.Maybe there is a similar option to implement the fully implicit<br>
> Runge-Kutta methods in PETSc 3.15 or other previous versions? For example,<br>
> if I want to solve a time dependent problem with a butcher table like<br>
> below, do I need to input it by myself?<br>
><br>
> Thank you very much for your help.<br>
><br>
<br>
I do not understand your question. IRK is only present is 3.16<br>
<br>
Thanks,<br>
<br>
Matt<br>
<br>
<br>
> Best regards,<br>
> Wang Jing-Yuan<br>
><br>
<br>
<br>
-- <br>
What most experimenters take for granted before they begin their<br>
experiments is infinitely more interesting than any results to which their<br>
experiments lead.<br>
-- Norbert Wiener<br>
<br>
<a href="https://www.cse.buffalo.edu/~knepley/" rel="noreferrer" target="_blank">https://www.cse.buffalo.edu/~knepley/</a> <<a href="http://www.cse.buffalo.edu/~knepley/" rel="noreferrer" target="_blank">http://www.cse.buffalo.edu/~knepley/</a>><br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>Ed Bueler<br>Dept of Mathematics and Statistics<br>University of Alaska Fairbanks<br>Fairbanks, AK 99775-6660<br>306C Chapman<br></div></div></div></div></div></div></div>