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How to limit the range of dependent variable？

Posted Jan 16, 2019, 10:13 p.m. EST 2 Replies

Tengwu He
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I want to solve the PDE in comsol in the special range for dependent variable. For example, the dependent variable,i.e., the concentration c is limited to c<=0.2 in the PDE, how to do?

2 Replies Last Post Jan 17, 2019, 4:31 a.m. EST
Pu
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Posted: 6 years ago Jan 17, 2019, 2:41 a.m. EST

There seems no option for this, but you might use penalty approach to achieve it.

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ZHANG, Pu
School of Physics,
Huazhong University of Science and Technology
There seems no option for this, but you might use penalty approach to achieve it.
Henrik Sönnerlind COMSOL Employee

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Posted: 6 years ago Jan 17, 2019, 4:31 a.m. EST

Hi,

There is no direct way for setting an upper limit. You can however set a lower limit using by adding a Lower Limit node to a segregated solver. If you can reformulate your problem, that may be an option.

Regards,
Henrik

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Henrik Sönnerlind
COMSOL
Hi, There is no direct way for setting an upper limit. You can however set a lower limit using by adding a **Lower Limit** node to a segregated solver. If you can reformulate your problem, that may be an option. Regards, Henrik

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