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To calculate surface charge

Posted May 7, 2015, 10:08 p.m. EDT Version 4.4, Version 5.0, Version 5.1 7 Replies

Kalpana Singh
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Hello

I am working on COMSOL 4.4. electromagnetic , frequency domain. I have modeled a periodic metallic nanostructure. Now, I want to calculate the surface charge on the surface of the structure. I don't know where is the option to calculate the surface charge. I know the boundary condition and the command too. Please let me know if anybody know about it.


Thanks
7 Replies Last Post May 14, 2015, 2:03 a.m. EDT
Lasse Murtomäki
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Posted: 10 years ago May 8, 2015, 6:00 a.m. EDT
Surface charge equals to the potential gradient normal to the surface multiplied by the permittivity.

br
Lasse
Surface charge equals to the potential gradient normal to the surface multiplied by the permittivity. br Lasse
Daniel Connelly
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Posted: 10 years ago May 8, 2015, 4:36 p.m. EDT
Or the normal component of the displacement field.
Or the normal component of the displacement field.
Kalpana Singh
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Posted: 10 years ago May 10, 2015, 10:49 p.m. EDT


Yeah...that I know how to get the surface charge from formula. But in COMSOL...where I should put this formula...and how and where I have to select the surface to get the surface charge. i would be very thankful to you for this help.


Thanks
Yeah...that I know how to get the surface charge from formula. But in COMSOL...where I should put this formula...and how and where I have to select the surface to get the surface charge. i would be very thankful to you for this help. Thanks
Lasse Murtomäki
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Posted: 10 years ago May 11, 2015, 1:59 a.m. EDT
If you mean post-processing, in Derived Values. Select the surface, take an average or an integral over that surface and type the expression of the displacement field in the appriopriate box. In finding the surface in a complex geometry, I always use the Selection List, by clicking around it may be rather difficult to find.

Did I understand your question at all?

br
Lasse
If you mean post-processing, in Derived Values. Select the surface, take an average or an integral over that surface and type the expression of the displacement field in the appriopriate box. In finding the surface in a complex geometry, I always use the Selection List, by clicking around it may be rather difficult to find. Did I understand your question at all? br Lasse
Kalpana Singh
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Posted: 10 years ago May 12, 2015, 9:35 a.m. EDT
Thanks for the reply.

Would you please suggest me any tutorial in which surface charge is calculated?

Thanks
Thanks for the reply. Would you please suggest me any tutorial in which surface charge is calculated? Thanks
Lasse Murtomäki
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Posted: 10 years ago May 12, 2015, 2:36 p.m. EDT
How about this? It is an electrochemical problem but shows the idea.

br
Lasse
How about this? It is an electrochemical problem but shows the idea. br Lasse

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Kalpana Singh
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Posted: 10 years ago May 14, 2015, 2:03 a.m. EDT
Thanks! It helped .
Thanks! It helped .

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