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What is the difference between solving in one step and solving separately

Posted 9 juin 2014, 17:08 UTC−4 Studies & Solvers Version 4.3b 5 Replies

Yilong Zhou
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Hi,

I have built a modeling including two modules, one is laminar flow and the other is transport of diluted species. Strangely, I found there is a little difference for the results between solving these two modules together using one step and separately solving the two modules using two linked steps. Could you explain why this difference happened.

If so, when can I separately solve modeling? And when I need to solve them together? Thank you.


5 Replies Last Post 12 juin 2014, 08:10 UTC−4
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 9 juin 2014, 23:24 UTC−4
Hi Yilong,

If a problem has two-way coupling then solving one Physics field in a Study by itself then solving the other in a different Study will yield different results than solving them together. When solved separately the results of the second Study will not be re-used to modify the first Physics model. Is that the case in your problem?

Nagi Elabbasi
Veryst Engineering
Hi Yilong, If a problem has two-way coupling then solving one Physics field in a Study by itself then solving the other in a different Study will yield different results than solving them together. When solved separately the results of the second Study will not be re-used to modify the first Physics model. Is that the case in your problem? Nagi Elabbasi Veryst Engineering
Yilong Zhou
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Posted: 1 decade ago 10 juin 2014, 15:04 UTC−4
Hi Nagi,

Thanks for your reply. I think I have gotten what you explained. Thus, that means, if the issue is single coupling, there is no difference between solving them separately and solving them together. Am I right?

Thanks for your help.

Regards,
Yilong
Hi Nagi, Thanks for your reply. I think I have gotten what you explained. Thus, that means, if the issue is single coupling, there is no difference between solving them separately and solving them together. Am I right? Thanks for your help. Regards, Yilong
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 10 juin 2014, 15:29 UTC−4
Yes provided that you solve them in the right order of course!
Yes provided that you solve them in the right order of course!
Yilong Zhou
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Posted: 1 decade ago 11 juin 2014, 17:46 UTC−4
Thank you so much.
Thank you so much.
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago 12 juin 2014, 08:10 UTC−4
Solving one-way coupled physics in consecutive steps should significantly reduce peak memory use compared to solving them with a fully coupled solution approach.
Jeff
Solving one-way coupled physics in consecutive steps should significantly reduce peak memory use compared to solving them with a fully coupled solution approach. Jeff

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