[petsc-users] SNES and TS for nonlinear quasi-static problems

[TARDIEU Nicolas]

Dear PETSc users,

I plan to solve nonlinear quasi-static problems with PETSc. More precisely, these are solid mechanics problems with elasto-plasticity.
So they do not involve  "physical time", rather  "pseudo time", which is mandatory to describe the stepping of the loading application.
In general, the loading vector F(x, t) is expressed as the following product  F(x, t)=F0(x)*g(t), where g is a scalar function of the pseudo-time.

I see how to use a SNES in order to solve a certain step of the loading history but I wonder if a TS can be used to deal with the loading history through the definition of this g(t) function ?

Furthermore, since too large load steps can lead to non-convergence, a stepping strategy is almost always required to restart a load step that failed. Does TS offer such a feature ?

Thank you for your answers.
Regards,
Nicolas
--
Nicolas Tardieu
Ing PhD Computational Mechanics
EDF - R&D Dpt ERMES
PARIS-SACLAY, FRANCE



Ce message et toutes les pièces jointes (ci-après le 'Message') sont établis à l'intention exclusive des destinataires et les informations qui y figurent sont strictement confidentielles. Toute utilisation de ce Message non conforme à sa destination, toute diffusion ou toute publication totale ou partielle, est interdite sauf autorisation expresse.

Si vous n'êtes pas le destinataire de ce Message, il vous est interdit de le copier, de le faire suivre, de le divulguer ou d'en utiliser tout ou partie. Si vous avez reçu ce Message par erreur, merci de le supprimer de votre système, ainsi que toutes ses copies, et de n'en garder aucune trace sur quelque support que ce soit. Nous vous remercions également d'en avertir immédiatement l'expéditeur par retour du message.

Il est impossible de garantir que les communications par messagerie électronique arrivent en temps utile, sont sécurisées ou dénuées de toute erreur ou virus.
____________________________________________________

This message and any attachments (the 'Message') are intended solely for the addressees. The information contained in this Message is confidential. Any use of information contained in this Message not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval.

If you are not the addressee, you may not copy, forward, disclose or use any part of it. If you have received this message in error, please delete it and all copies from your system and notify the sender immediately by return message.

E-mail communication cannot be guaranteed to be timely secure, error or virus-free.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20221219/77932db8/attachment-0001.html>