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Switching from Dirichlet Boundary Condition to Neumann Boundary condition

Posted Mar 24, 2023, 7:43 p.m. EDT Porous Media Flow, Equation-Based Modeling Version 5.4 1 Reply

Abul Borkot Md Rafiqul Hasan
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Hello everyone,

I am currently using the Coefficient form PDE module in COMSOL Multiphysics to solve for the saturation distribution in soil. I am facing an issue where I need to apply a saturation of 1 for the first 5 seconds and then switch to a zero flux boundary condition at that boundary.

Boundary conditions are as follows: **S = 1 for t<5 dS/dY = 0 for t>5 **

I would greatly appreciate any insights or advice on this issue. Thank you in advance for your help.

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1 Reply Last Post Mar 27, 2023, 11:28 a.m. EDT
Henrik Sönnerlind COMSOL Employee

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Posted: 2 years ago Mar 27, 2023, 11:28 a.m. EDT

This blog post may be helpful:

https://www.comsol.com/blogs/how-to-make-boundary-conditions-conditional-in-your-simulation

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Henrik Sönnerlind
COMSOL
This blog post may be helpful:

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