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Setting a maximum limit to a variable

Posted 2023/05/09 5:31 GMT-4 Fluid & Heat, Computational Fluid Dynamics (CFD), Heat Transfer Version 6.0 2 Replies

Shaik Subhani
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I am creating a user-defined variable for calculating pumping power, which will be a function of pressure difference and flow rate. I will use the pressure difference calculated by COMSOL as the input for the function. However, I want to set a maximum limit for the pumping power value, so that it does not exceed a certain threshold. Is there a built-in function in COMSOL that can help me achieve this?

2 Replies Last Post 2023/05/23 8:51 GMT-4
Jeff Hiller COMSOL Employee

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Posted: 12 months ago 2023/05/10 13:42 GMT-4
Updated: 12 months ago 2023/05/10 13:47 GMT-4

Hello Shaik,

You could accomplish this by using an expression involving booleans to define your pumping power function, something like

which equals f(p) when f(p) is less than 5 and saturates at 5 when f(p) is greater than 5.

Best,

Jeff

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Jeff Hiller
Hello Shaik, You could accomplish this by using an expression involving booleans to define your pumping power function, something like ( f(p) < 5 ) * f(p) + ( f(p) > 5 ) * 5 which equals f(p) when f(p) is less than 5 and saturates at 5 when f(p) is greater than 5. Best, Jeff
Shaik Subhani
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Posted: 11 months ago 2023/05/23 8:51 GMT-4

Thank you for your valuable explanation.

Thank you for your valuable explanation.

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