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Dirichlet and Neumann condition at the same boundary for coupled PDEs

Posted 6 juin 2024, 07:18 UTC−4 Equation-Based Modeling, Physics Interfaces Version 6.2 2 Replies

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 6 juin 2024, 08:36 UTC−4
Jeff Hiller COMSOL Employee

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Posted: 10 months ago 6 juin 2024, 08:24 UTC−4

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: 10 months ago 6 juin 2024, 08:36 UTC−4

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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