Non linear solver does not converge, and simulation is very very slow

Please login with a confirmed email address before reporting spam

Simulation is very very slow also non linear solver convergence error. When i try to increase the time for simulation, then i often encounter "non linear solver does not converge" error. I modified some things in segregated solver but that is making simulation very very slow. How can i solve that problem.



2 Replies Last Post 2025年4月18日 GMT-4 14:44
Jeff Hiller COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 1 week ago 2025年4月17日 GMT-4 15:39
Updated: 7 days ago 2025年4月18日 GMT-4 08:05

Hello Mohd,

Please consider posting your .mph file. Without it, Discussion Forum users are unlikely to volunteer guesses as to why your model in not converging.

Best,

Jeff

-------------------
Jeff Hiller
Hello Mohd, Please consider posting your .mph file. Without it, Discussion Forum users are unlikely to volunteer guesses as to why your model in not converging. Best, Jeff

Please login with a confirmed email address before reporting spam

Posted: 7 days ago 2025年4月18日 GMT-4 14:44

Hello Mohd,

Please consider posting your .mph file. Without it, Discussion Forum users are unlikely to volunteer guesses as to why your model in not converging.

Best,

Jeff

Hello Jeff, I appreciate your points but I can't share the file on public platform. I can describe my problem as related to droplet impact. I am using physics as Solid mechanics, laminar flow, level set to track interface. also about 500k elements are being used to simulate this. I am using direct solver(PARDISO), and segregated solver, what are the best possible settings i can tweak in order to get convergence. Thanks

>Hello Mohd, > >Please consider posting your .mph file. Without it, Discussion Forum users are unlikely to volunteer guesses as to why your model in not converging. > >Best, > >Jeff Hello Jeff, I appreciate your points but I can't share the file on public platform. I can describe my problem as related to droplet impact. I am using physics as Solid mechanics, laminar flow, level set to track interface. also about 500k elements are being used to simulate this. I am using direct solver(PARDISO), and segregated solver, what are the best possible settings i can tweak in order to get convergence. Thanks

Reply

Please read the discussion forum rules before posting.

Please log in to post a reply.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.