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Constraint the sum of two variables

Posted Feb 3, 2022, 4:53 a.m. EST Structural & Acoustics, General, Heat Transfer & Phase Change Version 5.6 2 Replies

Jian Zhang
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I am working on a problem with two dependent variables, and I have two PDEs to update these variables, respectively. Each variable should be between 0 and 1, and I constrain them via setting upper and lower limits in COMSOL. In addition, I also need to constrain the summation of these two variables smaller than 1, but I did not find a way to do this in COMSOL. Could anyone give me some tips about this?

2 Replies Last Post Feb 24, 2022, 5:43 a.m. EST
Acculution ApS Certified Consultant
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Posted: 2 years ago Feb 8, 2022, 2:44 a.m. EST

Can't you define a new variable as the sum of the two, and use that subsequently?

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René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
Can't you define a new variable as the sum of the two, and use that subsequently?
Jian Zhang
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Posted: 2 years ago Feb 24, 2022, 5:43 a.m. EST

Can't you define a new variable as the sum of the two, and use that subsequently?

Thanks for your suggestion, Rene. I will try to implement this.

>Can't you define a new variable as the sum of the two, and use that subsequently? Thanks for your suggestion, Rene. I will try to implement this.

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