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.

How to save computational time for transient CFD problem

Please login with a confirmed email address before reporting spam

Hi everybody, My model aims to couple fluid flow in the free channel (wellbore) and porous media (formation) for a time-dependent study, and the problem is that the computational time is very large.

I attemped to deal with this problem with respect to mesh and time-dependent solver (tolerance and time stepping). Using a coarser mesh and increasing tolerance are effective methods to reduce computational time, however, mesh refinement study is needed and tolerance should not to be too large for accuracy.

I am struggling about how to increase time step size as the simulation time increases. But the time step size did not seem to increase when I increased the simulatiuon time field from (0,1,10)min to (0,1,10)h no matter I used adaptive BDF or manual time stepping. Could someone give me some suggestions?

Thanks in advance!



0 Replies Last Post 21.01.2018, 18:13 GMT-5
COMSOL Moderator

Hello Zhaowang Lin

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

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.