Generalities
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A mesh (or sd_mesh) is a set of meshes of predefined types: HEXA8, TRIA3,...

These meshes are defined by a list of nodes that have coordinates. These are the knots that connect the meshes together. All the coordinates of the nodes in the mesh form a field at the nodes of the "geometry" quantity (cham_no/ GEOM_R).

A mesh can also contain mesh groups and named node groups. These groups are any: a mesh (for example) can belong to :math:`\mathrm{0,}\mathrm{1,}\mathrm{2,}\mathrm{...},n` groups.

Note that for static substructuring, a mesh can contain supermeshes (cells with any number of nodes).

When the mesh is formed of linear elements forming a continuous line, it can contain a map containing for each mesh the curvilinear abscissa of each node in the mesh, as well as a table containing the curvilinear abscissa of each node.

A skeleton (or sd_skeleton) is a mesh for visualizing results for dynamic substructures. It's a mesh with a few more objects.

A grid (or sd_grid) is a particular case of mesh for which all the nodes are aligned according to the directions of a local base.

If the mesh is obtained after a Local Average Contact (LAC) split, then sd_mesh contains 3 additional objects:. PATCH,. CONOPA,. COMAPA.