[petsc-users] TS initial guess

[Alfredo J Duarte Gomez]

Good morning PETSC team,

I have  a working algorithm for my implicit TS integrator with a system of
ODE/DAE's, but I am observing a rather high number of iterations

I am currently using the simplest settings of a TSBEULER and setting a
constant time step.

My question  right now is whether the default settings use any sort of
initial guess algorithm before every time step.

Since I have seen that the time step adapter calculates the Local
Truncation Error, it should be possible to use an extrapolation of
arbitrary order of accuracy as an initial guess for every time step right?
Can someone indicate how I would be able to use that?

Additionally, it would be very helpful to take a look at that initial
guess, is it possible to use any existing function to calculate it either
in the PreStep or PostStep function to visualize it?

Thank you,

-- 
Alfredo Duarte
Graduate Research Assistant
The University of Texas at Austin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20211011/b7a3cbe1/attachment.html>