FEM2D_POISSON_CG_LAKE is a FORTRAN90 library which defines the geometry of a lake-shaped region, as well as boundary conditions for a given Poisson problem, and is called by FEM2D_POISSON_CG as part of a solution procedure.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
FEM2D_POISSON_CG_LAKE is available in a C++ version and a FORTRAN90 version and a MATLAB version.
FEM2D_POISSON_CG, a FORTRAN90 program which solves Poisson's equation on a triangulated region, using the finite element method, sparse storage, and a conjugate gradient solver.
FEM2D_POISSON_CG_BAFFLE, a FORTRAN90 library which defines the geometry of a channel with 13 hexagonal baffles, as well as boundary conditions for a given Poisson problem, and is called by fem2d_poisson_cg as part of a solution procedure.
FEM2D_POISSON_CG_ELL, a FORTRAN90 library which defines the geometry of an L-shaped region, as well as boundary conditions for a given Poisson problem, and is called by fem2d_poisson_cg as part of a solution procedure.
You can go up one level to the FORTRAN90 source codes.