[petsc-users] Help and clarification on TS

[Stefano Zampini]

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> 
> Thanks for this link! So if i am understanding correctly, i can provide both rhs jacobian (which is A) and tje G function (Au+b), this way i can ru either fully implicit, either explicit. Am i right?
> 

Correct

> Thanks
> 
> On Sun, 8 Nov 2020, 20:15 Stefano Zampini, <stefano.zampini at gmail.com <mailto:stefano.zampini at gmail.com>> wrote:
> https://docs.petsc.org/en/latest/manual/ts/ <https://docs.petsc.org/en/latest/manual/ts/>
> 
> > On Nov 8, 2020, at 9:51 PM, Edoardo alinovi <edoardo.alinovi at gmail.com <mailto:edoardo.alinovi at gmail.com>> wrote:
> > 
> > Hello PETSc friend,
> > 
> > I hope you are all good and safe! 
> > 
> > During these few days I have been exploring the possibility to use TS for the time integration of the momentum equation in my finite volume solver. Actually I am doing this job with my own routines, however they are quite limited with respect to all the implicit and explicit methods that TS kindly provides. 
> > 
> > after the space discretization, my equation takes the form:
> > 
> > dudt = Au + b,
> > 
> > where A and b are both known.
> > 
> > I have several question being a beginner on TS,  however at this stage I would like to ask the following questions:
> > 
> > - Is TSSetRHSJacobian setting the matix A, while TSSetRHSFunction setting the vector?
> > 
> > - if the first question is yes, do I need to do additional operation to solve the equation implicitly? 
> > 
> > Many thanks for the suggestions! 
> > 
> > Edoardo
> > 
> > 
> > 
> 

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