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How to impose a boundary condition that is spatially varying

Posted 2009年9月1日 GMT-4 17:33 2 Replies

Ning Wu
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Hi, I am wondering how one can impose a boundary condition that is spatially changing. For example, if I have a boundary 0<x<1. The concentration along this boundary is c=x^2 or a general function c = f(x). How could I implement this in Comsol? I tried in boundary settings c=x^2. But it seems not working.

Thanks.
2 Replies Last Post 2009年9月2日 GMT-4 09:14
Jonathan Welch
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Posted: 2 decades ago 2009年9月1日 GMT-4 20:32
You can try using the functions definition dialog (Options->Functions) and define a new function (analytic is usually fine) and then in the Expression field you can define your expression X^2 or what not. Then in the boundary conditions dialog you just set the appropriate type of boundary condition and specify your function as the condition with whatever parameters are nessecary.

So if your function is defined as C(q) = q^2, then in the boundary dialog you can put C(x) if the variation is in the x direction.

~Jon
You can try using the functions definition dialog (Options->Functions) and define a new function (analytic is usually fine) and then in the Expression field you can define your expression X^2 or what not. Then in the boundary conditions dialog you just set the appropriate type of boundary condition and specify your function as the condition with whatever parameters are nessecary. So if your function is defined as C(q) = q^2, then in the boundary dialog you can put C(x) if the variation is in the x direction. ~Jon
Ning Wu
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Posted: 2 decades ago 2009年9月2日 GMT-4 09:14
Thanks, it works now.
Thanks, it works now.

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