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Using a counter in comsol

Posted 5 mai 2014, 11:58 UTC−4 Parameters, Variables, & Functions Version 5.1 3 Replies

Minh Khoa Nguyen
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I looked in the documentation and couldn't find any information on how to do this:

m = m + 10

I would like to have accumulate some value to m for each time step.

Please share some light if you know.
3 Replies Last Post 19 oct. 2015, 06:33 UTC−4
Frank van Gool COMSOL Employee

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Posted: 1 decade ago 8 mai 2014, 08:39 UTC−4
Dear Minh,

You can use a Global ODE as a counter in some sort.
Attached you find this example where I defined an m, where the time derivative of m (mt) is equal to 10. In other words, every second, 10 is added to m.
Not exactly every timestep, but I assumed that this was meant.

Note that if you really want to add 10 every timestep, you might be able to rewrite the time derivative of m in a way that it is dependent on "timestep".

Best regards,
Frank
Dear Minh, You can use a Global ODE as a counter in some sort. Attached you find this example where I defined an m, where the time derivative of m (mt) is equal to 10. In other words, every second, 10 is added to m. Not exactly every timestep, but I assumed that this was meant. Note that if you really want to add 10 every timestep, you might be able to rewrite the time derivative of m in a way that it is dependent on "timestep". Best regards, Frank

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Rashid
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Posted: 1 decade ago 26 sept. 2014, 09:35 UTC−4
Dear Frank
I am working on lithium-ion battery module. In this model the current switches from positive to negative and vice-versa. I want to count the cycle number. Could you suggest me that how I can find the cycle number.

Thanks and regards
IIT Delhi
Dear Frank I am working on lithium-ion battery module. In this model the current switches from positive to negative and vice-versa. I want to count the cycle number. Could you suggest me that how I can find the cycle number. Thanks and regards IIT Delhi
Itxaso
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Posted: 9 years ago 19 oct. 2015, 06:33 UTC−4
Dear Rashid,

I am in the same situation as you.
Did you finally manage to solve the problem?

I am modelling material removal. In each timestep there is a logic value (0 or 1) defining which elements should be eliminated. I would like accumulate these values in a counter variable, so that at the final time, the remaining elements have value 0 and the ones to eliminate >0.

Thank you in advance.

Best regards,

Itxaso



Dear Rashid, I am in the same situation as you. Did you finally manage to solve the problem? I am modelling material removal. In each timestep there is a logic value (0 or 1) defining which elements should be eliminated. I would like accumulate these values in a counter variable, so that at the final time, the remaining elements have value 0 and the ones to eliminate >0. Thank you in advance. Best regards, Itxaso

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