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The difference in Boundary Conditions

Posted Dec 28, 2011, 12:32 p.m. EST Chemical Reaction Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 1 Reply

Yoav Green
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Hi,
I have noticed that when I use the prepared modules for example -Transport of Diluted Species (TDS)and Electrostatics
Each module has numerous possibilities for boundary conditions which appear to be the same.
For example TDS has the No Flux condition which looks exactly the same as the Symmetry condition.
In Electrostatics, the No Flux condition appears to be the same as taking the surface charge density with a value of zero.

While I understand the physical difference between such BC, I would like to know whether or nor Comsol treats each of these BC differently when solving and etc'. Is it preferable to solving using one instead of the other under certain circumstances? If so- when?
Are these conditions here just to make it easier for us to produce models with BC that have a physical meaning compared to just using mathematical BC.

Thanks in advance.,
Yoav
1 Reply Last Post Apr 20, 2012, 8:04 a.m. EDT
COMSOL Moderator

Hello Yoav Green

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Patricio Davila
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Posted: 1 decade ago Apr 20, 2012, 8:04 a.m. EDT
I'm also wondering about this. In my current model I got basically the same results when applying the symmetry BC as when I applied the No Flux BC. I'm using the TDS interface and can't seem to notice any difference.

--
Patricio Davila
I'm also wondering about this. In my current model I got basically the same results when applying the symmetry BC as when I applied the No Flux BC. I'm using the TDS interface and can't seem to notice any difference. -- Patricio Davila

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