Dirichlet and Neumann condition at the same boundary for coupled PDEs

Anish Kumar Kodyingal

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Hi,

I have a coupled PDE system of variables u1 and u2 solved on a line of length L. I solve them in coefficient form in COMSOL. The boundary conditions I want to use are:

@ x=0 : zero flux (symmetry)

but at x=L : u1= constant1 (Dirichlet) ; u2x=constant2 (Neumann)

Thus, at the same boundary, I want to define two different format of boundary conditions for two different dependent variables. So, the system is not overdetermined so how do i accomplish this?

Any help is greatly appreciated!


2 Replies Last Post Jun 6, 2024, 8:36 a.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 5 months ago Jun 6, 2024, 8:24 a.m. EDT

Hello Anish,

You could create the model so that it has two physics interfaces each for one variable, instead of 1 physics interface for 2 variables.

Best,

Jeff

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Jeff Hiller
Hello Anish, You could create the model so that it has two physics interfaces each for one variable, instead of 1 physics interface for 2 variables. Best, Jeff

Anish Kumar Kodyingal

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Posted: 5 months ago Jun 6, 2024, 8:36 a.m. EDT

Hi Jeff,

Thank you so muc for the answer! Let me try that!

Thanks, Anish

Hi Jeff, Thank you so muc for the answer! Let me try that! Thanks, Anish

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