[petsc-users] Solution "jumps" after setting timestep

[Jed Brown]

What is the index of your DAE?  Can you show us code that exhibits this behavior?

"Moritz.Huck--- via petsc-users" <petsc-users at mcs.anl.gov> writes:

> Hi,
>
> I am using the IMEX Runge Kutta to solve an implicit DAE (G=0).
>
> When I manually set the time step (TSSetTimestep) my solution jumps.
>
> If I go from  a steady state to the  same state, it oscilates a few time and
> comes back to the steady solution.
>
>  
>
> Can this be prevented?
>
>  
>
> Thank you,
>
> Moritz
>
>
>