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Area Calculation in a results graph

Posted Apr 21, 2020, 3:21 p.m. EDT Heat Transfer & Phase Change, Heat Transfer, Results & Visualization Version 5.5 1 Reply

Reza Danesh
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Hi,

I want to calculate the ratio of blue area over the red area. How is it possible to get the surface area of this kind of plots from results.

Thanks in advance, Reza

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1 Reply Last Post Apr 21, 2020, 3:32 p.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 5 years ago Apr 21, 2020, 3:32 p.m. EDT

You can use the integration tools available under Derived Values. For the expression to integrate, specify a boolean expression along the lines of

quantity>cutoff_value1

or

quantity<cutoff_value2

Best,

Jeff

PS: If you even want COMSOL to compute the ratio of the two integrals without having to pull out your calculator, you can instead define a Nonlinear Coupling (found under Definitions in the model tree) of the integration type. If it's the first one in your model it will be called intop1 and in derived values you'd ask COMSOL to return, in essence, intop1(quantity>cutoff_value1)/intop1(quantity<cutoff_value2)

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Jeff Hiller
You can use the integration tools available under Derived Values. For the expression to integrate, specify a boolean expression along the lines of quantity>cutoff_value1 or quantitycutoff_value1)/intop1(quantity

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