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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Plotting Electric Field Gradient and "Dome-shaped" Electrical Field of Microelectrodes

Posted 2012年6月17日 GMT-4 09:18 Low-Frequency Electromagnetics Version 4.2a, Version 4.4 8 Replies

Bashar Yafouz
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Hi

I am using AC/DC module to simulate the electric field distribution over a microelectrode when applying AC input voltage. I manged to get the total electric field distribution E (V/m) over the microelectrode, its expression is "ec.normE".

However, I have two problems:

1) How can I plot the electric field gradient ∇|E2|? Its unit is (V2/m3).

2) Can Comsol plot the electric field in such a way it shows the "dome-shaped" electrical field?
Please refer to the attachment to see an example of "dome-shaped" electrical field.


Could anyone please help me in either questions?

Your help is much appreciated.

Bashar
8 Replies Last Post 2017年1月31日 GMT-5 09:18
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2012年6月17日 GMT-4 15:15
Hi

You want the gradient of the norm squared ? or something like (d(ec.normE^2,x), d(ec.normE^2,y), d(ec.normE^2,z))
I'm not sre it will work, but have a try (I'm not by my WS tonight ;), the gradient of the field are already there in COMSOL, the easiest to learn all the existing variables, is to enable the Equation view, and go through the lists of all variables

--
Good luck
Ivar
Hi You want the gradient of the norm squared ? or something like (d(ec.normE^2,x), d(ec.normE^2,y), d(ec.normE^2,z)) I'm not sre it will work, but have a try (I'm not by my WS tonight ;), the gradient of the field are already there in COMSOL, the easiest to learn all the existing variables, is to enable the Equation view, and go through the lists of all variables -- Good luck Ivar
Bashar Yafouz
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Posted: 1 decade ago 2012年6月17日 GMT-4 23:21
Thank you very much, Ivar. You helped me!
Thank you very much, Ivar. You helped me!
Yibei Zhao
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Posted: 1 decade ago 2012年8月7日 GMT-4 11:50
Dear Ivar,

I am working on cell separation with dielectrophoresis, AC module, and would like to use comsol for simulation. I have my design, but get stuck on entering right formula of gradient of the norm squared, would you please give me a hand on how to do this?

Thanks

Yibei Zhao
Dear Ivar, I am working on cell separation with dielectrophoresis, AC module, and would like to use comsol for simulation. I have my design, but get stuck on entering right formula of gradient of the norm squared, would you please give me a hand on how to do this? Thanks Yibei Zhao
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2012年8月8日 GMT-4 01:12
Hi

check the COMSOL formulas, (Options - Preferences - Show - Equations view ON) and adapt from those

--
Good luck
Ivar
Hi check the COMSOL formulas, (Options - Preferences - Show - Equations view ON) and adapt from those -- Good luck Ivar
Yibei Zhao
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Posted: 1 decade ago 2012年8月8日 GMT-4 13:21
Thank you very much Ivar, I just want to clarify if ther version you refered is the newst one. I am using comsol 3.5, and could not find "show" under preference. Is there any differeences of seeing equations in version 3.5 and the newest?

Thanks

Yibei
Thank you very much Ivar, I just want to clarify if ther version you refered is the newst one. I am using comsol 3.5, and could not find "show" under preference. Is there any differeences of seeing equations in version 3.5 and the newest? Thanks Yibei
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2012年8月9日 GMT-4 09:11
Hi

sorry I hadn't noticed that, yes there are many differences in the user interface between the two version, I cannot clearly remember now where it was hidden in 3.5, in one of the sub tabs of the physics, or via the main menu.
But try a search on the FORUM with the 3.5 key word, it has been mentioned a few times there
You have also full access to the variables, in v3.5, and can edit them (and reset them back to defaults with a single click ;)

--
Good luck
Ivar
Hi sorry I hadn't noticed that, yes there are many differences in the user interface between the two version, I cannot clearly remember now where it was hidden in 3.5, in one of the sub tabs of the physics, or via the main menu. But try a search on the FORUM with the 3.5 key word, it has been mentioned a few times there You have also full access to the variables, in v3.5, and can edit them (and reset them back to defaults with a single click ;) -- Good luck Ivar
ranaat
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Posted: 8 years ago 2016年11月1日 GMT-4 13:16
Hi,

How did COMSOL allow you to input commas ' , ' in the equation:

(d(ec.normE^2,x), d(ec.normE^2,y), d(ec.normE^2,z))



It throws exception when i try to configure this as my 2-D plot's equation.
Hi, How did COMSOL allow you to input commas ' , ' in the equation: (d(ec.normE^2,x), d(ec.normE^2,y), d(ec.normE^2,z)) It throws exception when i try to configure this as my 2-D plot's equation.
Syahirah Latfi
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Posted: 8 years ago 2017年1月31日 GMT-5 09:18
hi,

did you find a way how to get gradient of electric field????
hi, did you find a way how to get gradient of electric field????

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