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Difference between measured perimeter and calculated perimeter

Posted Mar 29, 2019, 4:55 a.m. EDT Geometry, Parameters, Variables, & Functions, Equation-Based Modeling Version 5.4 1 Reply

Ke Wang
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Hi all

I am trying to cauculate the perimeter of the geometery in my model.

Firstly, I used the measure function to acquire the perimeter.

Secondly, I defined a interpolation function intop(1) on the boundary of the geometry and I tried to compare them.

However, what I found is that there is difference between measured perimeter and calculated perimeter. And calculated one is smaller than the measured one as well as the real perimeter.

Is this allowable discrepency or the error of the defined perimeter-calculation-function?

Thanks in advance.

Best

1 Reply Last Post Mar 29, 2019, 7:53 a.m. EDT
Magnus Ringh COMSOL Employee

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Posted: 6 years ago Mar 29, 2019, 7:53 a.m. EDT
Updated: 6 years ago Mar 29, 2019, 7:58 a.m. EDT

Hi Ke,

Please see this Forum thread for some information about discrepancies in values computed by the Measure tool and the integration operator:

https://www.comsol.com/forum/thread/230392/question-regarding-the-calculation-of-area

Best regards,

Magnus Ringh, COMSOL

Hi Ke, Please see this Forum thread for some information about discrepancies in values computed by the Measure tool and the integration operator: Best regards, Magnus Ringh, COMSOL

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