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Arc length

Posted 22 oct. 2021, 12:58 UTC−4 Fluid & Heat, General, Computational Fluid Dynamics (CFD) 3 Replies

Natan Padoin
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Dear all,

I need to access the arc length as a function of time for a given curve in my simulation for post-processing purposes. Does anyone know the variable for that?

Best regards, NP

3 Replies Last Post 25 oct. 2021, 02:12 UTC−4
Acculution ApS Certified Consultant
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Posted: 3 years ago 23 oct. 2021, 07:36 UTC−4

Perhaps an integration operator on the boundary and a new variable length=intop1(1).

-------------------
René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
Perhaps an integration operator on the boundary and a new variable length=intop1(1).
Natan Padoin
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Posted: 3 years ago 23 oct. 2021, 09:45 UTC−4
Updated: 3 years ago 25 oct. 2021, 19:44 UTC−4

Perhaps an integration operator on the boundary and a new variable length=intop1(1).

Thank you for your reply! It partially solves the problem. In fact, I need to plot a quantity (and get data) along the arc length. Integrating using intop1(1) will return a single value (total length at a given time). COMSOL uses arc length as default for x-y plotting, but I need to access this variable since I have to modify it (getting a non dimensional parameter).

Thank you so much for your contribution!!

>Perhaps an integration operator on the boundary and a new variable length=intop1(1). Thank you for your reply! It partially solves the problem. In fact, I need to plot a quantity (and get data) along the arc length. Integrating using intop1(1) will return a single value (total length at a given time). COMSOL uses arc length as default for x-y plotting, but I need to access this variable since I have to modify it (getting a non dimensional parameter). Thank you so much for your contribution!!
Acculution ApS Certified Consultant
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Posted: 3 years ago 25 oct. 2021, 02:12 UTC−4

For all arc there is an inherent coordinate called 's' which runs from 0 to 1. You can use that to plot as a function of the arc length.

-------------------
René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
For all arc there is an inherent coordinate called 's' which runs from 0 to 1. You can use that to plot as a function of the arc length.

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