Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Cross-section average as function of position
Posted 2026年1月27日 GMT+9 11:32 General, Results & Visualization, User Interface Version 6.3 2 Replies
Please login with a confirmed email address before reporting spam
Hi everyone,
I have a simple system where I have a freely flowing tube depositing some concentration into a porous medium surrounding that tube. The tube is straight along a single axis and has regular dimensions.
I would like to calculate (and plot) the cross-sectional average of concentration as a function of length along the pipe (C_avg vs x). I only want data for the pipe, not the surrounding medium. However, I've had some trouble in locating the correct method/function to do this.
Any help would be greatly appreciated! Thank you in advance.
Best, Carl
Please login with a confirmed email address before reporting spam
Although I would love to hear what the ideal solution is, I came up with this:
-Make a second study with an auxiliary sweep of a position parameter "xp = range(start,step,end)" -Make a cut line in Results>Datasets>Cut Line 3D and set... x1 = x2 = xp, y1 = y2 = 0, z1 = 0 and z2 = radius_of_tube -Evaluated two line integrals in Results>Derived Values>Line Integration with expressions 2.pi.z.concentration and 2.pi.z. -I divided by the first integral results by the second, resulting in the average along that line (due to my symmetry, this is equivalent to avg of x-section)
Please login with a confirmed email address before reporting spam
This sounds like a Projection operator setup: https://doc.comsol.com/5.5/doc/com.comsol.help.comsol/comsol_ref_definitions.12.069.html
-------------------René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
