Gmsh is an open source 3D finite element mesh generator with a built-in CAD engine and post-processor. Its design goal is to provide a fast, light and user-friendly meshing tool with parametric input and advanced visualization capabilities. Gmsh is built around four modules: geometry, mesh, solver and post-processing.

Gmsh allows a particularly good link between the mesh generator and the Lagamine solver.

This file contains all the specific informations that are in the '.lag' file, it corresponds to point:

- 1.Title

- 2.Control data of the program

- 5.Degrees of freedom (DOF) renumbering

- ???? 6. Duplicata nodes ????

- ???? 8. ID Matrix ????

- ???? 9-bis. Incremental forming ????

- ???? 12. Imposed nodal forces ???? → .dep or .loa can be created by .geo ??

- 15. Constitutive laws

- 17. Elements

It represents the geometry of the simulation, from this file it is possible to get the '.msh' file.

In Gmsh, it is possible to create entities that are called “Physical group”, each Physical group has a tag and a name. the first one is automatically given by Gmsh. The name will follow a convention to give the rest of the information that is not contained in '.txt' file.

This convention is based on the Docuwiki numerotation:

They are automatically extract

For example, to apply gravity along axis x, with a value of 9.81. The name of the Physical group has to be “04019.81” or “04019.81000000”.