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Meshing Thin Dialectric in Air

Posted 16.11.2017, 20:13 GMT-5 Low-Frequency Electromagnetics, Mesh Version 5.2a 2 Replies

khurram
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Hi All,

New Comsol user here. I want to model the electric field in and around a thin dialectric (0.3um) sandwhiched between two conductive plates (3x60um) of thickness ~30um each in an air box. To get good resolution in the dialectric I swept it, dividing it into 5 layers. The air box cannot be swept and it gives an error when I apply a tetrahedral mesh because of the rectangular mesh on the sides of the dialectric (in contact with the air) created by the sweep. Meshing the entire model using the "Extremely Fine" mesh produces a mesh two tetrahedrals tall in the oxide which is not fine enough.

Is there a way I can sweep the dialectric while applying a tetrahedral mesh to the air, get finer resolution in the dialectric with a tetrahedral mesh or is there something I haven't considdered.

Thanks

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Khurram Tai
2 Replies Last Post 17.11.2017, 09:36 GMT-5
Sergei Yushanov Certified Consultant
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Posted: 7 years ago 17.11.2017, 08:57 GMT-5
Updated: 7 years ago 17.11.2017, 08:59 GMT-5

Dylan,

Instead of modeling thin dielectric layer as a solid domain, you can replace solid domain with a surface and use appropriate boundary condition. Several options avalable:

Electrostatics (es) physics interface: -Dielectric Shielding BC - Thin Low Permittivity Gap BC

Electric Currents (ec) physics interface: - Contact Inpedance BC - Electrical Contact BC - Electrical Shielding BC

Regards, Sergei

Dylan, Instead of modeling thin dielectric layer as a solid domain, you can replace solid domain with a surface and use appropriate boundary condition. Several options avalable: Electrostatics (es) physics interface: -Dielectric Shielding BC - Thin Low Permittivity Gap BC Electric Currents (ec) physics interface: - Contact Inpedance BC - Electrical Contact BC - Electrical Shielding BC Regards, Sergei
Jeff Hiller COMSOL Employee

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Posted: 7 years ago 17.11.2017, 09:36 GMT-5

Hello Dylan,

You can have a tet mesh to a swept mesh by using a conversion at the interface. See this blog post:

https://www.comsol.com/blogs/improving-your-meshing-with-swept-meshes/

See also the chapter on meshing in the Reference Manual for COMSOL Multiphysics. It contains very good tutorials at the end. Best,

Jeff

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Jeff Hiller
Hello Dylan, You can have a tet mesh to a swept mesh by using a conversion at the interface. See this blog post: https://www.comsol.com/blogs/improving-your-meshing-with-swept-meshes/ See also the chapter on meshing in the Reference Manual for COMSOL Multiphysics. It contains very good tutorials at the end. Best, Jeff

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