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How can i set a lower and upper limit to a dependent variable in COMSOL.

Posted 8 juil. 2021, 07:52 UTC−4 Chemical, Parameters, Variables, & Functions Version 5.6 2 Replies

Mikhil S
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I am working on a diffusion problem, and want to limit the values of the species mass fraction (which is the dependent variable) between 0 and 1. Can someone tell me how this can be done? Thanks.

2 Replies Last Post 8 juil. 2021, 09:33 UTC−4
Magnus Ringh COMSOL Employee

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Posted: 3 years ago 8 juil. 2021, 09:10 UTC−4
Updated: 3 years ago 8 juil. 2021, 09:37 UTC−4

Hi,

If you switch to a segregated solver (choose Segregated from a Stationary Solver node, for example), you can then add Lower Limit and Upper Limit subnodes to limit the values of field variables (dependent variables) in the model.

Best regards,

Magnus Ringh

Hi, If you switch to a segregated solver (choose **Segregated** from a **Stationary Solver** node, for example), you can then add **Lower Limit** and **Upper Limit** subnodes to limit the values of field variables (dependent variables) in the model. Best regards, Magnus Ringh
Mikhil S
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Posted: 3 years ago 8 juil. 2021, 09:33 UTC−4

Hi,

If you switch to a segregated solver (choose Segregated from a Stationary Solver node, for example, you can then add Lower Limit and Upper Limit subnodes to limit the values of field variables (dependent variables) in the model.

Best regards,

Magnus Ringh

@Magnus Thank you very much for the prompt reply. That helped.

>Hi, > >If you switch to a segregated solver (choose **Segregated** from a **Stationary Solver** node, for example, you can then add **Lower Limit** and **Upper Limit** subnodes to limit the values of field variables (dependent variables) in the model. > >Best regards, > >Magnus Ringh @Magnus Thank you very much for the prompt reply. That helped.

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