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Difference between measured perimeter and calculated perimeter

Posted 29 mar 2019, 04:55 GMT-4 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 29 mar 2019, 07:53 GMT-4
Magnus Ringh COMSOL Employee

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Posted: 6 years ago 29 mar 2019, 07:53 GMT-4
Updated: 6 years ago 29 mar 2019, 07:58 GMT-4

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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