On Tue, Oct 5, 2021 at 12:42 AM Wang Jingyuan <[email protected]> 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/>
