Generating a structured mesh (surfaces)

• To mesh surfaces with a structured mesh, select the option Mesh->Structured->Surfaces->Assign number of divisions to surface lines.
• Select all top surfaces 9, 24, 26 and 12 and press ESC.
• A window appears asking the number of divisions that the lines to be selected will have. Enter 4.
• Click Assign and select one vertical line⁵ (parallel to the Y axis). Press ESC.
• Another window appears in which to enter the number of divisions on the lines. Enter 6.
• Click Assign and select the 4 bottom lines⁵. Press ESC.
• Another window appears in which to enter the number of divisions on the lines. In this case, all the boundary lines have already been defined. Therefore, click Close.
• Select Mesh->Element type->Triangle. Select surfaces 26 and 12. Press ESC.
• Select Mesh->Generate mesh.
• A window comes up asking whether the previous mesh should be eliminated. Click Yes.
• Another window appears in which to enter the desired element size. Leave the default value unaltered and click OK. The result is the mesh shown.

• As seen in Figures, GiD can obtain surface structured meshes made of quadrilaterals or triangles. There are two kinds of structured mesh that use triangles: the one shown in Figure 7 is obtained when the Utilities->Preferences->Meshing->Structuration type->Symmetrical structured->triangles option is set. If this option is not set, the mesh presented in the previous figure is produced (with symmetrical structured extra center nodes are created).

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⁵ When selecting a line, GID automatically selects all lines 'topologically parallel' to it.