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To create a structured mesh, choose Structured -> Volumes/Surfaces/Lines. After selecting escape, the or number of elements per line or the size is given (depending on the option chosen: 'Assign number of cellsdivisions' or 'Assign size'). Later, lines can be selected and related lines (when dealing with surfaces or volumes) are added or deleted from the group. This process can be repeated as many times as necessary until all lines have a new value. Lines with no numbering given will have two elements over them. All non-selected lines will also have two elements by default.
In the case of surfaces, structured meshes can be four-sided, three-sided or centered structured.
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By default, the generated elements in four-sided structured meshes are triangles. In this case, triangles can be symmetrical or non-symmetrical (see Preferences ). These surfaces can also have quadrilateral elements.
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Three-sided structured meshes (relating to a three-sided surface) and centered structured meshes can only be meshed with triangles. Centered structured meshes can be centered either at a point on the surface itself, or at a point located on a particular surface boundary; for this, use the Set center option. If a center is not set, GiD will locate it automatically.
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When selecting this kind of structured mesh (i.e. centered), the following window appears where you need to enter the number of concentric and perimetric divisions, as well as the two weights to concentrate elements in the center of the structure or in the boundary.
In the case of volumes, a structured mesh is usually six-sided, but it can also have other configurations if center structured mesh is used in some of its faces.
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By default, the generated elements in six-sided structured volume meshes will be tetrahedra. In this case, they can be symmetrical or non-symmetrical (see Preferences). These volumes can also have hexahedral or prism elements.
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In the case of a centered structured or a three-sided surface in tops, the default element type is prism, but you can also choose to use tetrahedra.
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