Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Solver dependency

Please login with a confirmed email address before reporting spam

Hi,

I'm currently doing a simulation that involves free convection and I've read everything I could find on this forum about the subject. Something important that comes out, is that the solver that should be used is the "fully coupled" one. My solution is however converging with a "segregated" solver, but not with this fully coupled one. My question is the following : Can I trust my results independently of the solver (seeing that when I refine the mesh, the results are pretty much the same) ?

Thank you for the help. Best regards,
Pascal

1 Reply Last Post 2012年8月11日 GMT-4 03:23
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年8月11日 GMT-4 03:23
Hi

the difference is mainly in the speed and RAM use, a segregated solver usually uses less RAM but takes longer, while a Direct solver usually uses more RAM but can be faster.

Try it out: select the solver node (just above the segregated solver node) and add a direct solver node (right click), that will disable the segregated one, and resolve, and compare the results

If you do this in a new study sequence you can compare the two results and not overwrite ;)

--
Good luck
Ivar
Hi the difference is mainly in the speed and RAM use, a segregated solver usually uses less RAM but takes longer, while a Direct solver usually uses more RAM but can be faster. Try it out: select the solver node (just above the segregated solver node) and add a direct solver node (right click), that will disable the segregated one, and resolve, and compare the results If you do this in a new study sequence you can compare the two results and not overwrite ;) -- Good luck Ivar

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.