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.
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
