-.. _tui_generate_flat_elements_page:
-
-**********************
-Generate flat elements
-**********************
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-
-.. _tui_double_nodes_on_group_boundaries:
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-Double nodes on groups boundaries
-#################################
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-Double nodes on shared faces between groups of volumes and create flat elements on demand.
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-The list of groups must contain at least two groups. The groups have to be disjoint: no common element into two different groups.
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-The nodes of the internal faces at the boundaries of the groups are doubled. Optionally, the internal faces are replaced by flat elements.
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-Triangles are transformed into prisms, and quadrangles into hexahedrons.
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-The flat elements are stored in groups of volumes.
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-These groups are named according to the position of the group in the list:
-the group j_n_p is the group of the flat elements that are built between the group \#n and the group \#p in the list.
-If there is no shared faces between the group \#n and the group \#p in the list, the group j_n_p is not created.
-All the flat elements are gathered into the group named "joints3D" (or "joints2D" in 2D situation).
-The flat element of the multiple junctions between the simple junction are stored in a group named "jointsMultiples".
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-This example represents an iron cable (a thin cylinder) in a concrete bloc (a big cylinder).
-The big cylinder is defined by two geometric volumes.
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-.. literalinclude:: ../../../examples/generate_flat_elements.py
- :linenos:
- :language: python
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-:download:`Download this script <../../../examples/generate_flat_elements.py>`
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-Here, the 4 groups of volumes [Solid_1_1, Solid_2_1, Solid_3_1, Solid_4_1] constitute a partition of the mesh.
-The flat elements on group boundaries and on faces are built with the
-2 last lines of the code above.
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-If the last argument (Boolean) in DoubleNodesOnGroupBoundaries is set to 1,
-the flat elements are built, otherwise, there is only a duplication of the nodes.
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-To observe flat element groups, save the resulting mesh on a MED file and reload it.
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