FEM2D_POISSON_ELL
A 2D Poisson Problem in an L-shaped Region

FEM2D_POISSON_ELL is a FORTRAN library which defines the geometry of an L-shaped region and other data needed in order to execute the FEM2D_POISSON program.

This mesh, which uses 65 nodes, was created by starting with a crude mesh, and having it refined by TRIANGULATION_REFINE and renumbered by TRIANGULATION_RCM.

Licensing:

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

Languages:

FEM2D_POISSON_ELL is available in a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

FEM2D_POISSON, a C++ program which applies the finite element method to a 2D Poisson problem, with user input.

Source Code:

• ell.cpp, the user-supplied routines to evaluate the right hand side, linear coefficient, and boundary conditions;
• ell_output.txt, output from a run of the program;
• ell_nodes.txt, a text file containing a list, for each node, of its X and Y coordinates;
• ell_nodes.png, a PNG image of the nodes;
• ell_elements.txt, a text file containing a list, for each element, of the three nodes that compose it;
• ell_elements.png, a PNG image of the element mesh;
• ell_solution.txt, a text file containing the solution U at each node (X,Y);

You can go up one level to the C++ source code page.