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Same model, different results

Posted May 18, 2018, 12:01 p.m. EDT Structural & Acoustics Version 5.3 1 Reply

Josh Gam
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Hello, I am relatively new to COMSOL and am trying to run a study to see if there will be harmonic motion in my model. When I run the time-dependent study with the time being range(0,.01,4)[ms], I see some good harmonic motion. When I run it at range(0,.01,8)[ms], the harmonic motion is not there anymore (even in the 0 to 4 ms range where it showed up earlier). Nothing in the model changes. The only difference is a longer range of study. Why would this cause my solution to have completely different results?

1 Reply Last Post May 18, 2018, 12:16 p.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 6 years ago May 18, 2018, 12:16 p.m. EDT

Hi Josh,

Short answer: It's because the initial time step taken by the solver depends on the final time you give.

Long answer, see: https://www.comsol.com/forum/thread/108101/time-dependent-temperature?last=2016-03-31T06:37:28Z

Best,

Jeff

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Jeff Hiller
Hi Josh, Short answer: It's because the initial time step taken by the solver depends on the final time you give. Long answer, see: https://www.comsol.com/forum/thread/108101/time-dependent-temperature?last=2016-03-31T06:37:28Z Best, Jeff

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