GMSH_TO_FEM
Convert Mesh Data from GMSH to FEM Format.

GMSH_TO_FEM is a FORTRAN77 program which reads a mesh data file created by the GMSH program and writes a pair of node and element files that correspond to the FEM format.

Usage:

gmsh_to_fem prefix

• prefix.msh contains the GMSH mesh data file.
• prefix_nodes.txt will be the FEM node file created by the program.
• prefix_elements.txt will be the FEM element file created by the program.

Licensing:

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

Languages:

GMSH_TO_FEM is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

DOLFIN-CONVERT, a Python program which can convert a mesh file from Gmsh, MEDIT, METIS or SCOTCH format to an XML format suitable for use by DOLFIN or FENICS, by Anders Logg.

FEM_IO, a FORTRAN77 library which reads or writes node, element and data files defining a model associated with the finite element method (FEM).

FEM_TO_GMSH, a FORTRAN90 program which reads FEM files definining a 1D, 2D or 3D mesh, namely a file of node coordinates and a file of elements defined by node indices, and creates a Gmsh mesh file.

FEM2D, a data directory which contains examples of 2D FEM files, a pair of files defining the coordinates of nodes, and the nodes that form triangular elements.

GMSH, examples which illustrate the use of the Gmsh program, a 1D, 2D or 3D mesh generator that can create meshes suitable for use by the finite element method (FEM).

GMSH_IO, a FORTRAN77 library which can read or write some of the files created by the Gmsh program for 1D, 2D or 3D meshes used by the finite element method (FEM).

MEDIT_TO_FEM, a FORTRAN77 program which reads a mesh file created by the MEDIT program and writes a corresponding pair of node and element files that correspond to the FEM format.

TRIANGLE_TO_FEM, a FORTRAN77 program which reads the NODE and ELE files created by triangle() to describe a triangular mesh, and writes a corresponding pair of node and element files in the 2D FEM format.

XML_TO_FEM, a Python program which reads an XML file created by FENICS or DOLFIN, describing a mesh in 1D, 2D, or 3D, and creates corresponding FEM files, namely, a file of node coordinates, and a file of element connectivities.

Source Code:

• gmsh_to_fem.f, the source code.
• gmsh_to_fem.sh, BASH commands to compile the source code.

Examples and Tests:

• example_2d.msh, a sample 2D GMSH mesh file.
• example_2d_nodes.txt, the FEM node file created by the program.
• example_2d_elements.txt, the FEM element file created by the program.

List of Routines:

• MAIN is the main program for GMSH_TO_FEM.
• CH_CAP capitalizes a single character.
• CH_EQI is a case insensitive comparison of two characters for equality.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• GET_UNIT returns a free FORTRAN unit number.
• GMSH_DATA_READ reads sizes from a GMSH file.
• GMSH_SIZE_READ reads sizes from a GMSH file.
• I4MAT_WRITE writes an I4MAT file.
• R8MAT_WRITE writes an R8MAT file.
• S_BEGIN is TRUE if one string matches the beginning of the other.
• S_TO_I4 reads an I4 from a string.
• S_TO_R8 reads an R8 from a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

You can go up one level to the FORTRAN77 source codes.