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

[Moritz.Huck at isea.rwth-aachen.de]

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


 

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