> On Apr 23, 2025, at 11:47 AM, PERRIER-MICHON Augustin
> <augustin.perrier-mic...@ensma.fr> wrote:
>
> Dear Mr Smith,
>
> Thank you for your answer.
>
> Maybe I do not understand your interrogation because I am not familiar with
> fluid flow simulations. Each physics are solved on an entire time step at
> every time step.
So different variables (degrees of freedom) are integrated in each
"sub-physics" time-step?
> This is a quasi static problem with an incremental loading. Later I will add
> time dependent phenomena thus I chose TS solver.
>
> Thanks
> Augustin
>
> Le 2025-04-23 17:38, Barry Smith a écrit :
>> I am unfamiliar with this simulation type, so I have some elementary
>> questions. Is each "physics" taking a fractional time-step so that the
>> total time
>> integrated (in a time-step) is 1/2dt + 1/2dt or is one physics
>> stepping the entire time-step and the other physics "fixing up some of
>> the variables" (for example, in fluid flow where a pressure solve
>> doesn't step in time it merely changes some variables values to
>> enforce incompressibility at the new time). Another way to phrase the
>> question is are the underlying equations a DAE, not an ODE?
>> Barry
>>> On Apr 23, 2025, at 10:20 AM, PERRIER-MICHON Augustin
>>> <augustin.perrier-mic...@ensma.fr> wrote:
>>> Dear Petsc users,
>>> I am currently dealing with finite element fracture analysis using phase
>>> field model. To perform such simulations, I have to develop a staggered
>>> solver : mechanical problem is solved at constant damage and damage problem
>>> is solved at constant displacement.
>>> I created 2 TS solver and 2 DMPLEX for each "physics".
>>> Each physics's system is built using TSSetIFunction and TSSetIJacobian with
>>> associated functions.
>>> The TS calls are performed with TSSTEP in order to respect staggered solver
>>> scheme in iterative loops.
>>> My question : Is the using of TSSTEP function adapted to a staggered solver
>>> ? How to use this function in my framework ? Have you got any other
>>> suggestions or advices ?
>>> Thanks a lot
>>> Best regards
>>> --
>>> Augustin PERRIER-MICHON
>>> PhD student institut PPRIME
>>> Physics and Mechanics of materials department
>>> ISAE-ENSMA
>>> Téléport 2
>>> 1 Avenue Clément ADER
>>> 86361 Chasseneuil du Poitou- Futuroscope
>>> Tel : +33-(0)-5-49-49-80-97
