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[Getfem-users] WG: `Coupling Equations

From: Pichler, Franz
Subject: [Getfem-users] WG: `Coupling Equations
Date: Thu, 26 Jan 2012 14:08:30 +0100

I posted this question months ago and I still would be quite interested in an 

>Hello everybody,
>I just get started with getfem and have some questions. What I want to
>do is to couple several equations. A minimal example of that would be
>something like:
>Div(a1 \grad u) + Div(b1 \grad v) =g1
>Div(a2 \grad u) + Div(b2 \grad v) =g2
>That with some Dirichlet condition on the interval [0,1]
>Now I managed to do something like this buy taking the non model
>framework and assemble some matrices with the asm elliptic tools and put
>these matrices together by "hand".
>What I am wondering now is
>1) Is there a brick that I can tell that in my equation there are two
>variables with a laplacian (elliptic) term?
>2) If I would try to write this brick myself, would I have to do it in
>c++ (I am using the python interface)
>3) Is there a way of assembling this without the model framework and
>without putting the matrices together "by hand"
>I would like to do all of this as time efficient as possible because in
>the end I want to solve time dependent problems with nonlinear terms.
>Thank you very much in advance ,
>Franz Pichler

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