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Using exact time from Event Interface

Posted May 19, 2016, 7:05 a.m. EDT Version 5.2 4 Replies

Nhan Nguyen
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Hi everyone,

I am wondering that How can I extract value of time from Event interface during Time-Dependent Solver to use for another purpose?

For example, I use Event Interface to set up an expression : "A-100 >0"
Can I use the value of time when the expresssion changes form False to True ?

Thanks a lot for any help !

Best Regards,
N.N
4 Replies Last Post May 24, 2016, 5:44 a.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 9 years ago May 20, 2016, 9:02 a.m. EDT
Hello Nhan,
Have you considered using the approach mentioned in the thread www.comsol.com/community/forums/general/thread/112182/ ?
Best regards,
Jeff
Hello Nhan, Have you considered using the approach mentioned in the thread https://www.comsol.com/community/forums/general/thread/112182/ ? Best regards, Jeff
Nhan Nguyen
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Posted: 9 years ago May 21, 2016, 2:53 p.m. EDT
Hi Jeff,
Thanks a lot for your help !
I read your thread you mentioned before and I find it very useful.


But I have not still known how to do something like this :

For example, I use Event Interface to set up an expression : "A-100 >0"
Then I declare a new expression in ODE like this : "t-t_event" (t_event is the moment as the expression above becomes TRUE )
If A-100 >10 at t=5.5 [s], for instance, the value of "t_event" is supposed to be 5.5

Can I do that in Comsol ?

Thanks a lot for your help !
Hi Jeff, Thanks a lot for your help ! I read your thread you mentioned before and I find it very useful. But I have not still known how to do something like this : For example, I use Event Interface to set up an expression : "A-100 >0" Then I declare a new expression in ODE like this : "t-t_event" (t_event is the moment as the expression above becomes TRUE ) If A-100 >10 at t=5.5 [s], for instance, the value of "t_event" is supposed to be 5.5 Can I do that in Comsol ? Thanks a lot for your help !
Jeff Hiller COMSOL Employee

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Posted: 9 years ago May 23, 2016, 9:00 a.m. EDT
The idea is to use a global ODE to integrate a state parameter set initially to 1 and which changes value to 0 when the event occurs. From that point on, the variable for the ODE will be "stuck" at the time at which the event occurred.
Please contact COMSOL Support (support@comsol.com) if you need further help with this.
Best,
Jeff
The idea is to use a global ODE to integrate a state parameter set initially to 1 and which changes value to 0 when the event occurs. From that point on, the variable for the ODE will be "stuck" at the time at which the event occurred. Please contact COMSOL Support (support@comsol.com) if you need further help with this. Best, Jeff
Nhan Nguyen
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Posted: 9 years ago May 24, 2016, 5:44 a.m. EDT
Hi Jeff,
Thank you very much for your help !
Hi Jeff, Thank you very much for your help !

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