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

[Smith, Barry F.]

> On Dec 12, 2018, at 4:09 AM, Moritz.Huck--- via petsc-users <petsc-users at mcs.anl.gov> wrote:
> 
> Hi,
> sorry I missed the last response.
>  
> The system should be index 1 (being not a 100% certain I calculated everything correct, it can be at most of index 2).
> I cannot show the code easily, the code is quite complex (the system arises from a FEM discretization).
> As additional information the solution also jumps when the adaptive solver reduces the timestep by a large amount.

  Hmm, are you sure the RHS function or IFunction are correct, possibly not continuous?

   Barry

>  
> Best Regards,
> Moritz