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Cricular cross section 2D modelling in cantilever carbon nanotube problem

Posted Apr 4, 2011, 11:59 p.m. EDT Version 4.0, Version 4.1 1 Reply

David Carvajal
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Hello,
I've been working with pull-in and pul-out voltages for a carbon nanotube NEM system.
Currently I'm using 2D modelling but I cannot get accurate results due to the thickness definition. I would like to know if there is some way I can model the circular coss section in 2D? I've read about using the 2D axysimmetric coordinate system but all my problem uses cartesian coordinates except for the tube shape so I do not think it's a good idea.

Thank you for your time


Best regards,


David Felipe Carvajal
Universidad de los Andes
Colombia
1 Reply Last Post Apr 5, 2011, 1:34 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Apr 5, 2011, 1:34 a.m. EDT
Hi

Axisymmetry means that the axis is NOT moving radially, which is a specific symmetry condition that might not be what you want. The only other way I see is to set the thickness to something reasonable, but still, you will get "fringe" effects

So you might need to use 3D ...

--
Good luck
Ivar
Hi Axisymmetry means that the axis is NOT moving radially, which is a specific symmetry condition that might not be what you want. The only other way I see is to set the thickness to something reasonable, but still, you will get "fringe" effects So you might need to use 3D ... -- Good luck Ivar

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