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How can I optimize the Time-step in Time-dependent analysis

Posted Jun 22, 2017, 8:27 a.m. EDT 2 Replies

NDN UNIST/Mechanical Engineering

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Hi all

I am doing the Time dependent study for Particle Tracing for Fluid flow. But actually I am clear the value of Time-step.
If we consider two case of Time range as:
Case 1: range(0,1,10)
Case 2: range(0,0.01,10)

Both begin with 0s and end with 10s but only different by Time-step.

So, which value of time-step is better ? is more accurate ? And the result of simulation is same or different ?

thanks so much for your reading my topic

2 Replies Last Post Jun 22, 2017, 11:42 a.m. EDT

Jeff Hiller COMSOL Employee

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Posted: 7 years ago

There have been several discussions on this topic in the Discussion Forum. You will find them with a search.
One for instance that discusses the relation to tolerances and accuracy is this one: www.comsol.com/community/forums/general/thread/50111
See also this one where it is explained why the final time impacts the entire solution:
www.comsol.com/community/forums/general/thread/108101
Best,
Jeff

NDN UNIST/Mechanical Engineering

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Posted: 7 years ago

Thanks so much, Dr.Jeff Hiller

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How can I optimize the Time-step in Time-dependent analysis

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