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how to add time dependent heat source

Posted Aug 28, 2014, 2:52 p.m. EDT Version 4.4 5 Replies

Fred Xie
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Hi

I am kinda new with COMSOL. I am wondering how to add time dependent heat source.
I have a 2D geometry, and a heat source in the center of the geometry.
I would like to have a time-varied heat source (in total power), and do time dependent simulation.

Thanks

5 Replies Last Post Sep 2, 2014, 4:53 a.m. EDT
Pieter Westerik
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Posted: 1 decade ago Aug 29, 2014, 10:34 a.m. EDT
So you want something like q=f(t) or Tsource=f(t)? What should f look like?
So you want something like q=f(t) or Tsource=f(t)? What should f look like?
Fred Xie
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Posted: 1 decade ago Aug 30, 2014, 12:10 a.m. EDT
I would like the f(t) to be a Sin() function.
I would like the f(t) to be a Sin() function.
Pieter Westerik
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Posted: 1 decade ago Sep 1, 2014, 2:33 a.m. EDT
Then you can put for the parameter of the heat source that you want to vary with time just something like 'A*sin(B*t)+C', where you replace A, B and C with actual numbers, or you define them as parameters beforehand.
Then you can put for the parameter of the heat source that you want to vary with time just something like 'A*sin(B*t)+C', where you replace A, B and C with actual numbers, or you define them as parameters beforehand.
Fred Xie
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Posted: 1 decade ago Sep 1, 2014, 10:42 p.m. EDT

Then you can put for the parameter of the heat source that you want to vary with time just something like 'A*sin(B*t)+C', where you replace A, B and C with actual numbers, or you define them as parameters beforehand.


Thank you for your help. I understand the approach in general. However, would you please give a little more step-by-step guide?

Thanks again.
[QUOTE] Then you can put for the parameter of the heat source that you want to vary with time just something like 'A*sin(B*t)+C', where you replace A, B and C with actual numbers, or you define them as parameters beforehand. [/QUOTE] Thank you for your help. I understand the approach in general. However, would you please give a little more step-by-step guide? Thanks again.
Pieter Westerik
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Posted: 1 decade ago Sep 2, 2014, 4:53 a.m. EDT
Can you then maybe upload your model so that I can use that as a starting point for the steps that you have to do? And what parameter of your heat source do you want to vary with time? Temperature? Heat flux? Something else?
Can you then maybe upload your model so that I can use that as a starting point for the steps that you have to do? And what parameter of your heat source do you want to vary with time? Temperature? Heat flux? Something else?

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