poisson_mixed

poisson_mixed, a FENICS script which uses the a mixed method for the Poisson equation.

The equation has the form

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Note that I have installed FENICS using Docker, and so to run this script I issue the commands:

1. cd $HOME/fenicsproject/poisson_mixed
2. fenicsproject run
3. python3 poisson_mixed.py
4. exit

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Reference:

1. Hans Petter Langtangen, Anders Logg,
   Solving PDEs in Python - The FEniCS Tutorial Volume 1.

Source Code:

• poisson_mixed.py a script which sets up and solves the problem.
• poisson_mixed.txt the output file.
• u.png a plot of the solution.
• sigma.png a plot of the solution gradient.