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AC field Simulation

Posted 28.10.2011, 15:42 GMT-4 Low-Frequency Electromagnetics Version 4.3a 8 Replies

Faiza Javed
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Hi,

I have to do a simple Simulation in comsol multiphysics 4.1 and i am just a beginner in this work,i have to build an electrode geometry and apply various frequency and voltage ac signals and see the resulting electric field profile
which ac model shalll i add (electric currents(ec)?) and to apply potential i shall assign ground and potential values?
While frequency domain is selected from study1? if yes then what is the purpose of global definition and various functions placed there?

8 Replies Last Post 04.05.2013, 13:01 GMT-4
COMSOL Moderator

Hello Faiza Javed

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If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Andy Liu
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Posted: 1 decade ago 06.02.2012, 13:59 GMT-5
I am using 3.5a. I don't know how to apply AC voltage and set frequency either. Anyone here provide some help?

I use conductive medium DC in AC/DC. I think I need to change the module or some solvers? I tried but cannot figure it out...
I am using 3.5a. I don't know how to apply AC voltage and set frequency either. Anyone here provide some help? I use conductive medium DC in AC/DC. I think I need to change the module or some solvers? I tried but cannot figure it out...
Robert Koslover Certified Consultant
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Posted: 1 decade ago 06.02.2012, 14:59 GMT-5
Attached are a couple simple 3D examples (which I just threw together) of a tilted probe in a cylindrical container of a liquid, for two different versions of Comsol (as noted in the file names). The probe is sinusoidally driven between +/- 1V, at 50, 55, and 60 Hz but you can set your own frequencies as you wish. The container is grounded, except for the top surface which has a no-current (insulating) condition. You can plot potentials, currents, etc. Hope this example helps. Good luck.
Attached are a couple simple 3D examples (which I just threw together) of a tilted probe in a cylindrical container of a liquid, for two different versions of Comsol (as noted in the file names). The probe is sinusoidally driven between +/- 1V, at 50, 55, and 60 Hz but you can set your own frequencies as you wish. The container is grounded, except for the top surface which has a no-current (insulating) condition. You can plot potentials, currents, etc. Hope this example helps. Good luck.
Faiza Javed
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Posted: 1 decade ago 06.02.2012, 16:23 GMT-5
Thankyou Soo much Mr. Robert..it would really be very helpful regarding my work..


Kind Regards,
Faiza
Thankyou Soo much Mr. Robert..it would really be very helpful regarding my work.. Kind Regards, Faiza
Andy Liu
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Posted: 1 decade ago 09.02.2012, 02:40 GMT-5

Attached are a couple simple 3D examples (which I just threw together) of a tilted probe in a cylindrical container of a liquid, for two different versions of Comsol (as noted in the file names). The probe is sinusoidally driven between +/- 1V, at 50, 55, and 60 Hz but you can set your own frequencies as you wish. The container is grounded, except for the top surface which has a no-current (insulating) condition. You can plot potentials, currents, etc. Hope this example helps. Good luck.


Thanks very much for your help, Mr. Robert Koslover

I tried your method in my example. Your are sweeping a parameter but If I only want to apply a sinusoidal signal with a certain frequency. How should I do that ? Use a time-depend solver ?


Thanks in advance.
[QUOTE] Attached are a couple simple 3D examples (which I just threw together) of a tilted probe in a cylindrical container of a liquid, for two different versions of Comsol (as noted in the file names). The probe is sinusoidally driven between +/- 1V, at 50, 55, and 60 Hz but you can set your own frequencies as you wish. The container is grounded, except for the top surface which has a no-current (insulating) condition. You can plot potentials, currents, etc. Hope this example helps. Good luck. [/QUOTE] Thanks very much for your help, Mr. Robert Koslover I tried your method in my example. Your are sweeping a parameter but If I only want to apply a sinusoidal signal with a certain frequency. How should I do that ? Use a time-depend solver ? Thanks in advance.
Andy Liu
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Posted: 1 decade ago 09.02.2012, 02:40 GMT-5

Attached are a couple simple 3D examples (which I just threw together) of a tilted probe in a cylindrical container of a liquid, for two different versions of Comsol (as noted in the file names). The probe is sinusoidally driven between +/- 1V, at 50, 55, and 60 Hz but you can set your own frequencies as you wish. The container is grounded, except for the top surface which has a no-current (insulating) condition. You can plot potentials, currents, etc. Hope this example helps. Good luck.


Thanks very much for your help, Mr. Robert Koslover

I tried your method in my example. Your are sweeping a parameter but If I only want to apply a sinusoidal signal with a certain frequency. How should I do that ? Use a time-depend solver ?


Thanks in advance.
[QUOTE] Attached are a couple simple 3D examples (which I just threw together) of a tilted probe in a cylindrical container of a liquid, for two different versions of Comsol (as noted in the file names). The probe is sinusoidally driven between +/- 1V, at 50, 55, and 60 Hz but you can set your own frequencies as you wish. The container is grounded, except for the top surface which has a no-current (insulating) condition. You can plot potentials, currents, etc. Hope this example helps. Good luck. [/QUOTE] Thanks very much for your help, Mr. Robert Koslover I tried your method in my example. Your are sweeping a parameter but If I only want to apply a sinusoidal signal with a certain frequency. How should I do that ? Use a time-depend solver ? Thanks in advance.
Faiza Javed
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Posted: 1 decade ago 25.04.2012, 01:43 GMT-4
Dear Robert!
Can you please send me some examples of A.C. field modulation moder for comsol multiphysics version 4.1??
i would be really pleased to have it!!

Dear Robert! Can you please send me some examples of A.C. field modulation moder for comsol multiphysics version 4.1?? i would be really pleased to have it!!
Abid Iqbal
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Posted: 1 decade ago 26.11.2012, 04:03 GMT-5
I have applied the AC voltage by using wave function. I set wave function, its frequency and then applied it in voltage. It is working fine. Now i want to find electric field gradient on the sphere, Can anyone help me in this regards?
I have applied the AC voltage by using wave function. I set wave function, its frequency and then applied it in voltage. It is working fine. Now i want to find electric field gradient on the sphere, Can anyone help me in this regards?
Jinghui Luo
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Posted: 1 decade ago 04.05.2013, 13:01 GMT-4
Hi Abid,

Would you please tell me how to define the AC voltage by using wave function? How to define its frequency? And how to actually apply it to voltage?

Thank you in advance!
Jinghui
Hi Abid, Would you please tell me how to define the AC voltage by using wave function? How to define its frequency? And how to actually apply it to voltage? Thank you in advance! Jinghui

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