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Re: [Getfem-users] Example of a simple mixed-problem, or problem with t

From: Iago Barbeiro
Subject: Re: [Getfem-users] Example of a simple mixed-problem, or problem with two variables
Date: Sun, 5 Jul 2009 13:05:05 -0300

Dear Jehanzeb,

I think you may start by looking the Stokes example.
It deals with two variables (û=uî+v^j and p) and has the term div(û).dp.
Bon courage!


On Sun, Jul 5, 2009 at 6:07 AM, Jehanzeb Hameed <address@hidden> wrote:

Is there a simple example in getfem where assembly is for two
variables? E.g. we may want to solve for "u" and "q" (with an equation
defining the relationship between u and q) . Such a case arises in
mixed methods.  Is there an example for mixed-poisson problem
somewhere? I know mixed-elasticity problem is given with getfem, but I
am not familiar with that particular problem.

In particular, I am not sure how to refer to "q" and "u" in
generic_assembly routines. Say my weak form involves div(q) . v ? How
will I write this in "assem.set" routine? (I am guessing thats what I
am supposed to do).


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