Menu

Discussion Forum

New Discussion
Filter

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 The information provided may be out of date.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.

Automatic time step increase in generalized-alpha solver

Posted Apr 3, 2014, 10:32 a.m. EDT Low-Frequency Electromagnetics, Studies & Solvers Version 4.3 2 Replies

Chang-Ho Han
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Particle tracing is conducted by a generalized-alpha solver.
For many cases, when the particle motion is finished, the time step is increased drastically.
However, in current case, time step is oscillating.
In some case, when I turn off the Brownian force (which is a monte carlo modelling), this problem is solved.
However, this is not a solution for the current problem.
What should I do for avoiding this problem?
This problem causes the longer solution time.

Attachments:

2 Replies Last Post Apr 4, 2014, 12:02 a.m. EDT
Nagi Elabbasi Facebook Reality Labs
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Apr 3, 2014, 4:21 p.m. EDT
Hi Chang-Ho,

With Brownian force you COMSOL needs a small enough time step such that the random force is “applied” a sufficient number of times. If you loosen the convergence tolerances COMSOL will take bigger time steps.

Nagi Elabbasi
Veryst Engineering
Hi Chang-Ho, With Brownian force you COMSOL needs a small enough time step such that the random force is “applied” a sufficient number of times. If you loosen the convergence tolerances COMSOL will take bigger time steps. Nagi Elabbasi Veryst Engineering
Chang-Ho Han
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago Apr 4, 2014, 12:02 a.m. EDT
Thank you for the rapid response^^

Is it also dependent on the particle number?
Thank you for the rapid response^^ Is it also dependent on the particle number?

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.

Suggested Content