[petsc-users] TS snes failure

[Jed Brown]

Looks like I fixed this after petsc-3.2 was released.

http://petsc.cs.iit.edu/petsc/petsc-dev/rev/9d0d4

On Sun, Nov 27, 2011 at 14:55, Mike Sussman <sussmanm at math.pitt.edu> wrote:

> Thank you, Matt, for your response.
>
> I am calling TSSolve(), and I am checking all return codes, using
> CHKERRQ.
>
> The case I am running is very similar to the ts tutorial example ex2f.F,
> re-formulated as a DAE.  I am using TSTHETA.  The line starting
> "Timestep =" is from the MyMonitor function in that example.  The line
> starting "(DAE)" is my line, printed after the TSSolve() has completed.
>
> For example, I ran a case with 100 time steps, turning on
> -snes_converged_reason and -snes_monitor.  The final several steps are:
>
>  46 SNES Function norm 4.129815386097e+00
>   47 SNES Function norm 4.129815386096e+00
>   48 SNES Function norm 4.129815386095e+00
>   49 SNES Function norm 4.129815386095e+00
>   50 SNES Function norm 4.129815386095e+00
>  Nonlinear solve did not converge due to DIVERGED_MAX_IT
> Timestep =    99,time =    0.839 sec, error [2-norm] =  1.132E+00, error
> [max-norm] =  1.635E+00
>    0 SNES Function norm 4.106011479715e+00
>    1 SNES Function norm 4.105987638450e+00
>  Nonlinear solve did not converge due to DIVERGED_LINE_SEARCH
> Timestep =   100,time =    0.847 sec, error [2-norm] =  1.144E+00, error
> [max-norm] =  1.652E+00
> (DAE) Number of time-steps   100 final time   8.4746E-01 solution norm
> 1.0823E+01
>
> --
> Mike Sussman
>
>
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