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To calculate surface charge

Posted 2015年5月8日 GMT+8 10:08 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 2015年5月14日 GMT+8 14:03
Lasse Murtomäki
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Posted: 1 decade ago 2015年5月8日 GMT+8 18:00
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: 1 decade ago 2015年5月9日 GMT+8 04:36
Or the normal component of the displacement field.
Or the normal component of the displacement field.
Kalpana Singh
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Posted: 1 decade ago 2015年5月11日 GMT+8 10:49


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: 1 decade ago 2015年5月11日 GMT+8 13:59
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: 1 decade ago 2015年5月12日 GMT+8 21:35
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: 1 decade ago 2015年5月13日 GMT+8 02:36
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: 1 decade ago 2015年5月14日 GMT+8 14:03
Thanks! It helped .
Thanks! It helped .

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