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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 |

Hello,
I posted this question months ago and I still would be quite interested in an
answer.
Thanks
Franz
>*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*
>

**[Getfem-users] WG: `Coupling Equations**,
*Pichler, Franz* **<=**