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 The information provided may be out of date.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.

Limitation in the number of answers in a time dependent model

Please login with a confirmed email address before reporting spam

I am running a time dependent simulation in the Rotating machinery-laminar flow module. I am using the BDF (Backwards differential formula) method. I am try to find the time in which the velocity of my model stabilizes. I ran three different simulations with a time step of 0.1 during 5 s, 10 s and 20s . However, I am obtaining the same answers for the three models, because COMSOL is giving me just the first 50 time step solutions, which means the answers for the first 5 seconds.

Is there something should I modify in COMSOL to obtain more data, or does it mean that after 5 seconds the model is stable and for this reason COMSOL is not giving me any more solutions?

1 Reply Last Post 30 janv. 2012, 01:23 UTC−5
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 30 janv. 2012, 01:23 UTC−5
Hi

read carefully the doc about the time stepping solver, and try time step "intermediate or strict in the time stepping tab of your transient solver sub-node

--
Good luck
Ivar
Hi read carefully the doc about the time stepping solver, and try time step "intermediate or strict in the time stepping tab of your transient solver sub-node -- 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.