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 The information provided may be out of date.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.
What is the aplication of Meshing in this software?
Posted 25.08.2015, 01:46 GMT-4 Computational Fluid Dynamics (CFD) Version 4.4 2 Replies
Please login with a confirmed email address before reporting spam
Hai guys, Actually Application of meshing is to get approximately good results. That mean finest meshing provides better results than the coarsest mesh but In this comsol software is not happening that much of variation. I tried for changing different mesh size, but no variation is observed so please help me .
2 Replies Last Post 25.08.2015, 23:49 GMT-4
Please login with a confirmed email address before reporting spam
Posted:
9 years ago
Hi
there is no 1:1 rule there. You need a reasonable mesh quality to get "good" results, but thereafter, the mesh density does not result into any "linear increase in precision". This is really very model dependent. Furthermore, COMSOL is set up such that the "default" mesh quality is mostly adequate to get to "good" results.
So what are "good" results ?
a few decades ago 10-20% concordance with measurements were considered perfect, today we are more at 1%, often better, but mostly we do not have precise enough material data or true BC load conditions to be able to get results far better than 1:100 or there-around.
Anyhow a FEM model is just a simplified representation of reality, do not expect too much. Still its great to learn physics and very helpful to dimension complex systems :)
--
Good luck
Ivar
there is no 1:1 rule there. You need a reasonable mesh quality to get "good" results, but thereafter, the mesh density does not result into any "linear increase in precision". This is really very model dependent. Furthermore, COMSOL is set up such that the "default" mesh quality is mostly adequate to get to "good" results.
So what are "good" results ?
a few decades ago 10-20% concordance with measurements were considered perfect, today we are more at 1%, often better, but mostly we do not have precise enough material data or true BC load conditions to be able to get results far better than 1:100 or there-around.
Anyhow a FEM model is just a simplified representation of reality, do not expect too much. Still its great to learn physics and very helpful to dimension complex systems :)
--
Good luck
Ivar
Please login with a confirmed email address before reporting spam
Posted:
9 years ago
WOW, Thank you.. thank you very much sir, for your quick response. @Ivar