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Where do I limit the range of dependent variables?

Posted Sep 1, 2020, 9:27 a.m. EDT Version 5.2a 1 Reply

Patricia PhD student
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I am simulating a space-dependent 2D gas-solid reaction system, in which solids are reactants and products. However, solids do not participate in the reaction expression and therefore, the concentrations of formed and reacted solids are computed as source terms (negative for the reagent and positive for the product) as it reacts with the gas (first order reaction), which diffuses through the solid. Therefore, I need to limit the concentration of the solid reagent to 0 and the concentration of the solid product to a defined maximum value. Where can I limit these values in Comsol Multiphysics 5.2?

1 Reply Last Post Sep 3, 2020, 2:29 a.m. EDT
Magnus Ringh COMSOL Employee

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Posted: 4 years ago Sep 3, 2020, 2:29 a.m. EDT

Hi,

In the latest version of COMSOL Multiphysics, version 5.5, you can add Lower Limit and Upper Limit nodes to limit the values of the dependent variables when using a segregated solver.

Best regards,

Magnus Ringh, COMSOL

Hi, In the latest version of COMSOL Multiphysics, version 5.5, you can add **Lower Limit** and **Upper Limit** nodes to limit the values of the dependent variables when using a segregated solver. Best regards, Magnus Ringh, COMSOL

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