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How to distinguish between inner and outer bounadry conditions.

Posted Jun 8, 2010, 8:24 a.m. EDT RF & Microwave Engineering, LiveLink for MATLAB, Modeling Tools & Definitions, Parameters, Variables, & Functions 3 Replies

Clemens Schriever
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Hello!

I have created a MATLAB script to set up 2D and 3D RF models.
To assign the correct boundary conditions I would need to be able to distinguish between inner and outer boundaries.

Is there any way to find out which index in fem.appl.bnd.ind corresponds to an inner and which to an outer boundary?

There should be a way, because Comsol in GUI mode is able to distinguish between the boundaries, however, I couldn't find a solution yet.

Thanks alot for your ideas!!!!!

Clemens
3 Replies Last Post Sep 20, 2010, 5:55 a.m. EDT
Christopher David
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Posted: 1 decade ago Jun 9, 2010, 12:14 p.m. EDT
Hello!

This is a good question because I am having the exact same problem. If there is no way to do this, has anyone come up with any workarounds, etc? Thanks for any help in advance!
Hello! This is a good question because I am having the exact same problem. If there is no way to do this, has anyone come up with any workarounds, etc? Thanks for any help in advance!
Mark Roy
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Posted: 1 decade ago Aug 24, 2010, 3:38 p.m. EDT
The way that I handled this in 3.5x was to get a list of boundaries for each subdomain in my geometry (using geomcsg).
To figure out which boundaries are "interior", simply compare the list of boundaries for one subdomain to the list of boundaries for all other subdomains. If the same boundary belongs to two or more subdomains, then it is "interior".

Dont ask me how to do this in 4.0... that's part of my current dilemma.

Mark Roy
The way that I handled this in 3.5x was to get a list of boundaries for each subdomain in my geometry (using geomcsg). To figure out which boundaries are "interior", simply compare the list of boundaries for one subdomain to the list of boundaries for all other subdomains. If the same boundary belongs to two or more subdomains, then it is "interior". Dont ask me how to do this in 4.0... that's part of my current dilemma. Mark Roy
Micke Malmström
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Posted: 1 decade ago Sep 20, 2010, 5:55 a.m. EDT
You wouldn't hapen to have some sample code?
You wouldn't hapen to have some sample code?

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