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Which surface the terminal voltage should apply to in the electrostatics analysis?
Posted Jun 24, 2013, 4:26 a.m. EDT Low-Frequency Electromagnetics Version 4.3a 1 Reply
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I want to calculate the electric capacity between two metal plates then I do a model in comsol as follow:
I draw two blocks with a 2µm gap between them,and the material of the two blocks are set to aluminum,and the gap is filled with gas. then the boundary conditions of "Ground" and "Terminal" should be the surfaces of blocks away from gas(surface A and D in schematic diagram) or the surfaces of blocks overlap with gas(surface B and C in schematic diagram)? I got two different results in the conditions above mentioned,and why? the two blocks are metal and should be a equipotential body in the real world and why i got a different result in the comsol?
thanks a lot!
I draw two blocks with a 2µm gap between them,and the material of the two blocks are set to aluminum,and the gap is filled with gas. then the boundary conditions of "Ground" and "Terminal" should be the surfaces of blocks away from gas(surface A and D in schematic diagram) or the surfaces of blocks overlap with gas(surface B and C in schematic diagram)? I got two different results in the conditions above mentioned,and why? the two blocks are metal and should be a equipotential body in the real world and why i got a different result in the comsol?
thanks a lot!
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1 Reply Last Post Jul 4, 2013, 5:43 a.m. EDT
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Posted:
1 decade ago
You may try to simulate this tutorial :Transient Modeling of a Capacitor in a Circuit
www.comsol.com/showroom/gallery/12695/
which is included in your model library.
After simulation, the two metal is equipotential.
You can add a 3D Plot Group, and add a Isosurface. Set the Expression as defacult "V", change the "Levels" by "Levels" rather than "number of levels", and choose "Interactive". You can now slide the interactive bar from 0 to the maximum value which is near 1, and you may see the two equipotential surface when "V" is 0 and the maximum value.
You can also see the Model Exchange examples：
www.comsol.com/community/exchange/143/
www.comsol.com/community/exchange/140/
Good luck!
www.comsol.com/showroom/gallery/12695/
which is included in your model library.
After simulation, the two metal is equipotential.
You can add a 3D Plot Group, and add a Isosurface. Set the Expression as defacult "V", change the "Levels" by "Levels" rather than "number of levels", and choose "Interactive". You can now slide the interactive bar from 0 to the maximum value which is near 1, and you may see the two equipotential surface when "V" is 0 and the maximum value.
You can also see the Model Exchange examples：
www.comsol.com/community/exchange/143/
www.comsol.com/community/exchange/140/
Good luck!