## Generating the Mesh

ATILA requires that the mesh be composed exclusively of second order elements. The corre-sponding setting can be found under the Meshing menu. Select Quadratic Elements, then Quadratic. Note that this option is automatically set when you open the ATILA-GiD interface.
We will create mix of structured rectangles mesh and unstructured triangle mesh. Note that such mixing of element types in GiD is currently only available in 2D. Also note that only four-sided surfaces can be structured.
First, we define the structured mesh. Select Meshing | Structured | Surfaces.

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