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What is "Maximum Element growth rate" and "curvature factor" in the Mesh section?

Posted May 30, 2016, 4:05 p.m. EDT Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers, Structural Mechanics Version 5.2 5 Replies

Richard Storm
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Under "Mesh" node and then under "size" , I see a section named "Element size parameters". Inside it there is this "Maximum Element growth rate" and "curvature factor" that Comsol always automotically fill for me. I was wondering what are they and how do they affect my solution. For example if I increase the curvature factor, does that mean the solution will be more accurate but more time consuming in terms of convergence or what? The same question for Maximum Element growth rate. what I do not understand is that I alwasy assume my elements should growth independent of my physics?
5 Replies Last Post Mar 15, 2017, 3:43 p.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 9 years ago May 30, 2016, 5:16 p.m. EDT
Hi

These are parts of the manual settings to change the mesher behaviour, too long to explain here, check the doc, and the blog pages... (for the docs, index your principal COMSOL PDF and run a global search on them, that is the fastest way to get the relevant info)

And with COMSOL its very easy to make "toy models" they are build and solved in minutes, so my way is each time I have a doubt about a setting, a variable ... I make a simple model and try out the variable or settings ALONE inside COMSOL, then you learn the quickest

--
Good luck
Ivar
Hi These are parts of the manual settings to change the mesher behaviour, too long to explain here, check the doc, and the blog pages... (for the docs, index your principal COMSOL PDF and run a global search on them, that is the fastest way to get the relevant info) And with COMSOL its very easy to make "toy models" they are build and solved in minutes, so my way is each time I have a doubt about a setting, a variable ... I make a simple model and try out the variable or settings ALONE inside COMSOL, then you learn the quickest -- Good luck Ivar
AntoineV
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Posted: 8 years ago Mar 14, 2017, 10:50 a.m. EDT
Dear Ivar

this is the issue with Comsol : there is very little info in the docs and we always have to look into blogs or cases submitted by users.

I printed the chapter about Meshing (70 pages) : there is not a single word about these parameters.

More generally, the Comsol doc is very unsufficient and relies on users to go through blogs or solved cases and have them adapted to their specific issue.
I would feel much more happy with a comprehensive user manual..

Best regards

Antoine
Dear Ivar this is the issue with Comsol : there is very little info in the docs and we always have to look into blogs or cases submitted by users. I printed the chapter about Meshing (70 pages) : there is not a single word about these parameters. More generally, the Comsol doc is very unsufficient and relies on users to go through blogs or solved cases and have them adapted to their specific issue. I would feel much more happy with a comprehensive user manual.. Best regards Antoine
Jeff Hiller COMSOL Employee

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Posted: 8 years ago Mar 14, 2017, 11:15 a.m. EDT
Hello Antoine,
That's strange. Using Ctrl+F, I found the role of both parameters discussed in the chapter on Meshing, on page 550 of the Reference Manual for COMSOL Multiphysics, version 5.2a.
I checked in version 5.2 of the doc, and there it's on page 532.
Best regards,
Jeff
Hello Antoine, That's strange. Using Ctrl+F, I found the role of both parameters discussed in the chapter on Meshing, on page 550 of the Reference Manual for COMSOL Multiphysics, version 5.2a. I checked in version 5.2 of the doc, and there it's on page 532. Best regards, Jeff
AntoineV
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Posted: 8 years ago Mar 14, 2017, 11:18 a.m. EDT
Indeed ! I missed it !! Thanks a lot Jeff :)
Indeed ! I missed it !! Thanks a lot Jeff :)
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 8 years ago Mar 15, 2017, 3:43 p.m. EDT
Hello,

Indeed it's easy to miss important points in the doc, as there are so many physics, and so much to say, and so much being said by COMSOL!
That is why I index all COMSOL pdf documents, unfortunately I have only the MS indexer that is really poor, but still it finds most of it, I just have to get use to the US orthography, Europe here, I use British English by default ;)

--
Good luck
Ivar
Hello, Indeed it's easy to miss important points in the doc, as there are so many physics, and so much to say, and so much being said by COMSOL! That is why I index all COMSOL pdf documents, unfortunately I have only the MS indexer that is really poor, but still it finds most of it, I just have to get use to the US orthography, Europe here, I use British English by default ;) -- Good luck Ivar

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