Menu

Discussion Forum

New Discussion
Filter

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.

Why only changing the range of output times affects the results?

Posted Mar 25, 2024, 9:55 a.m. EDT Fluid & Heat Version 6.2 1 Reply

子昂 顾
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

I am doing a thermo-hydraulic simulation. I only change the output times from range(0,1,480) to range(0,1,600), but the result at TIME=120 differs in the two calculations. I want to know the reason. It doesn't seem to make any sense.

1 Reply Last Post Mar 25, 2024, 10:37 a.m. EDT
Jeff Hiller COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 7 months ago Mar 25, 2024, 10:37 a.m. EDT
Updated: 7 months ago Mar 25, 2024, 12:03 p.m. EDT

The reason for this is that by default the initial timestep taken by the solver is dependent on the final time. This has been discussed a few times in the Discussion Forum, see e.g. this thread. Please refer to this Knowledge Base entry for a more detailed explanation and guidelines on how to proceed.

Best,

Jeff

-------------------
Jeff Hiller
The reason for this is that by default the initial timestep taken by the solver is dependent on the final time. This has been discussed a few times in the Discussion Forum, see e.g. [this thread](https://www.comsol.com/forum/thread/86623/solution-changes-with-time?last=2015-07-31T13:25:21Z). Please refer to [this Knowledge Base entry](https://www.comsol.com/support/knowledgebase/1254) for a more detailed explanation and guidelines on how to proceed. Best, Jeff

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