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Virtual Electrical Connection

Posted Jul 22, 2021, 5:19 p.m. EDT Electromagnetics, Electromagnetic Heating, Low-Frequency Electromagnetics Version 5.6 4 Replies

BR
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Is it possible to connect two surfaces/boundaries virtually in COMSOL? I am studying joule heating as well as magnetic analysis of copper bars, and drawing interconnection wires/geometry for electrical connection is appearing to be difficult with the component under consideration. Is there a way I can choose two surfaces/boundaries and speciy that there is a zero electrical voltage difference in these? This in essence would provide a continous path of current in between two selected surfaces.

As an example, I am trying to connect (3) and (4) which are electrically isolated. Refer to the attachment.

Many thanks,

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4 Replies Last Post Jul 24, 2021, 6:35 p.m. EDT
Dave Greve
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Posted: 3 years ago Jul 22, 2021, 9:07 p.m. EDT

When applying the Terminal or Potential boundary conditions you can select multiple boundaries.

When applying the Terminal or Potential boundary conditions you can select multiple boundaries.
BR
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Posted: 3 years ago Jul 23, 2021, 12:02 p.m. EDT

Thank you for suggestions, however, these boundaries cannot be applied inside the air domain. I have been trying to perform magentic analysis with box drawn to act as an air domain, and I was unable to connect two conductors inside the air box using the above suggested boundaries.

Thank you for suggestions, however, these boundaries cannot be applied inside the air domain. I have been trying to perform magentic analysis with box drawn to act as an air domain, and I was unable to connect two conductors inside the air box using the above suggested boundaries.
BR
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Posted: 3 years ago Jul 23, 2021, 12:41 p.m. EDT

So with the Joule heatign case, it is possible to select floating potential boundaries with value of 0V which ensures continuity of current as shown below.

So with the Joule heatign case, it is possible to select floating potential boundaries with value of 0V which ensures continuity of current as shown below.

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Robert Koslover Certified Consultant
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Posted: 3 years ago Jul 24, 2021, 6:35 p.m. EDT
Updated: 3 years ago Jul 24, 2021, 6:36 p.m. EDT

You seem to be talking about coupling the behavior (or the value of a quantity, such as potential) that is appearing in one location (such as on a boundary or surface) to a different location (such as a different boundary or surface). If so, you may wish to explore a Comsol feature called "coupling variables." Be aware that these can be tricky to use correctly. Right-click Definitions, choose "Non-local couplings," and consider the various choices offered to you. Consult the help system and application library for examples.

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Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
You seem to be talking about coupling the behavior (or the value of a quantity, such as potential) that is appearing in one location (such as on a boundary or surface) to a different location (such as a different boundary or surface). If so, you may wish to explore a Comsol feature called "coupling variables." Be aware that these can be tricky to use correctly. Right-click Definitions, choose "Non-local couplings," and consider the various choices offered to you. Consult the help system and application library for examples.

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