Menu

Discussion Forum

New Discussion
Filtrer

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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.

How to calculate a volume in a 2D-Axissymmetric modeling ?

Posted 5 mars 2014, 09:20 UTC−5 Version 4.4 2 Replies

Hans Gennerich
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

How can I correctly calculate the volume (changing in time) of a 3D Cylinder by means of a 2D-Axissymmetric modeling ?

A multiplication of the integral of the area of the 2D cross-section with Pi and with the instant maximum radius of the body might help. But even if this would work ... Then: How is the name of the appropriate "r" variable?
2 Replies Last Post 5 mars 2014, 11:16 UTC−5
Hans Gennerich
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 5 mars 2014, 09:52 UTC−5
Some helpful hint follows from
www.comsol.com/community/forums/general/thread/42791/
I have to check a checkbox, to make COMSOL realize, that I truely want the 3D volume, when I calculate 2D-axissymmetric model.

Something remains unclear:
When I use the Gauss-Formula for the volume, using the surface-integral
Volume = SurfaceIntegral(r*solid.nr)
I get twice the true volume as the result.

How do I have to modify this formula to calculate correct results?
Some helpful hint follows from http://www.comsol.com/community/forums/general/thread/42791/ I have to check a checkbox, to make COMSOL realize, that I truely want the 3D volume, when I calculate 2D-axissymmetric model. Something remains unclear: When I use the Gauss-Formula for the volume, using the surface-integral Volume = SurfaceIntegral(r*solid.nr) I get twice the true volume as the result. How do I have to modify this formula to calculate correct results?
Hans Gennerich
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 5 mars 2014, 11:16 UTC−5
Abandoned in favour of a new thread
Abandoned in favour of a new thread

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content