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Electric field model in a flexible circuit

Posted 18.02.2011, 18:21 GMT-5 Electromagnetics, Low-Frequency Electromagnetics Version 4.1 2 Replies

Michael Purdy
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Hello,

I am trying to model the electric field caused by a flexible circuit that is configured into a rectangular prism. I am very new to COMSOL and am resceiving an error which I cannot fix. I have attached my model, and if anyone has any suggestions I would greatly appreciate it.

As mentioned, the model is simulating the electric field created by a circuit. The smaller rectangles around the prism are the electrodes which should be made of gold. The rest of the prism walls are made of polymide. The prism is hollow in the middle, so there, and everywhere surrounding the flexible membrane should be air.

Thanks a lot for any help you may have.

Michael
2 Replies Last Post 22.02.2011, 13:47 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 19.02.2011, 16:05 GMT-5
Hi

the main error you are doing is to use the infinite elements all the way up to the electrodes, if you simply disable the Inf elements it solves OK.

Then you will see that the block you are using is rather "small" and will influence the result,

So I can only suggest to use a sphere of air of somewhat larger size, and then add a "shell around of thickness
about 1/10 of the sphere radius and apply spherical infinite element conditions to this shell only (be sure you set the origine of the inf elemens at the centre of the sphere)

By the way you should update your version (see the main web site or call your COMSOL rep) you have still the original 4.1.0.88 version, several fixes has been added in the latest patched release

--
Good luck
Ivar
Hi the main error you are doing is to use the infinite elements all the way up to the electrodes, if you simply disable the Inf elements it solves OK. Then you will see that the block you are using is rather "small" and will influence the result, So I can only suggest to use a sphere of air of somewhat larger size, and then add a "shell around of thickness about 1/10 of the sphere radius and apply spherical infinite element conditions to this shell only (be sure you set the origine of the inf elemens at the centre of the sphere) By the way you should update your version (see the main web site or call your COMSOL rep) you have still the original 4.1.0.88 version, several fixes has been added in the latest patched release -- Good luck Ivar
Michael Purdy
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Posted: 1 decade ago 22.02.2011, 13:47 GMT-5
Great, thanks Ivar. I will try what you suggested. I'm not sure I know what using infinite elements really does :P
And thanks for the tip on updating my version. I will get on that as well.

Michael
Great, thanks Ivar. I will try what you suggested. I'm not sure I know what using infinite elements really does :P And thanks for the tip on updating my version. I will get on that as well. Michael

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