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Implementing 1D first order PDEs in the weak form
Posted 21 sept. 2018, 09:25 UTC−4 Modeling Tools & Definitions, Parameters, Variables, & Functions, Equation-Based Modeling 0 Replies
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Hi everyone,
I need some help to implement weak form PDEs in comsol.
I'm trying to implement the following system of 1D first order PDEs in the weak form:
with 
.
In weak form these equations are
So I think that using the "weak form PDE module" I can writte this problem by inserting
-vt*test(phi1) - c1*test(phi1)*Px
-Pt*test(phi2) - c2*test(phi2)*vx
in the "weak form PDE" node and the boundary conditions by using the "dirichlet boundary conditions" node. However, I don't know how to insert the right hand side of the second equation.
For a scalar PDE, tt seems that it can be done by is using the "weak contribution" node at the point of the domain, as I saw in this tutorial. But I don't know how to use the weak contribution node when I have two weak pdes. Anyone know how to help me?
Thanks in advance,
Gustavo
Hello Gustavo Andrade
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