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Meshing Using Geometry Difference Feature

Posted Apr 15, 2012, 7:15 p.m. EDT Fluid & Heat, Geometry, Mesh Version 4.2 3 Replies

Andre Coleman Jr.
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I'm doing a project for an aerospace class in which I'm completing a fluid-structure analysis of a balloon design. In order to generate the balloon structure and interior helium I used a difference in geometry (See the attached COMSOL model). When I go to mesh the model setup I recieve an error that domain 2, the balloon domain, doesn't mesh properly. I figure there may be an issue with the geometry difference feature. Can anyone provide any insight on my issue? I wish to generate a mesh of the entire model ASAP.

Thank you in advance!

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3 Replies Last Post Apr 16, 2012, 10:28 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 16, 2012, 2:46 a.m. EDT
Hi

you issue is that you have a far too coarse mesh, and your very thin entity (Domain 2) needs to be defined with a "extremely fine" mesh Size (or even finer = manual settings)

Furthermore, I'm not sure your material is really well represented by "Linear Elastic" but why not start with that

--
Good luck
Ivar
Hi you issue is that you have a far too coarse mesh, and your very thin entity (Domain 2) needs to be defined with a "extremely fine" mesh Size (or even finer = manual settings) Furthermore, I'm not sure your material is really well represented by "Linear Elastic" but why not start with that -- Good luck Ivar
Andre Coleman Jr.
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Posted: 1 decade ago Apr 16, 2012, 5:41 a.m. EDT
Thank you for your help. I will try meshing it again with your suggestions. Also, I changed the linear-elastic model to hyperelastic. Maybe that will descirbe the deformation of the balloon better.
Thank you for your help. I will try meshing it again with your suggestions. Also, I changed the linear-elastic model to hyperelastic. Maybe that will descirbe the deformation of the balloon better.
Li-ion
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Posted: 1 decade ago Apr 16, 2012, 10:28 a.m. EDT
Hi,

Try to predifine the mesh of cube = Normal and Edge=extremely fine

You will get the response

Dinh An
Hi, Try to predifine the mesh of cube = Normal and Edge=extremely fine You will get the response Dinh An

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