Square
Use the Square () or Square (Center) () node to add a square to your geometry, as shown in Figure 7-33.
Figure 7-33: Two squares used to model the autocatalytic conversion of a substance.The plots show the concentration of the two species.
To create a square, you can:
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Right-click the Geometry node and add a Square node to the sequence, then define it in the Settings window, or
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In the Geometry toolbar Draw group, from the Rectangle () menu, select Square () or Square (Center) (). Then draw the square in the Graphics window. Also see Drawing Geometric Primitives in the Graphics Window.
To draw a square, click Square or Square (Center). Then, click one corner (or the center) of the square in the Graphics window. Drag the mouse to the desired position of a corner. When you release the mouse button, a solid square appears, and a Square node is added to the geometry sequence.
When you have added a node or finished drawing the square in the Graphics window, you can use the following section to define it or fine-tune it.
Object Type
From the Type list, select Solid or Curve to specify if the square is a solid object or a curve object.
When using the geometry toolbar, the Solid button () is available to toggle between drawing a solid object or an outline (or curve) instead of selecting an Object Type. See Geometry Drawing Toolbar Buttons for other drawing toolbar buttons.
Size
Define the size of the square in the Side length field.
Position
Enter the position of the square using the x and y fields (r and z in 2D axial symmetry, xw and yw in work planes). From the Base list, choose Center if the square is centered about the position, or choose Corner if the square has a corner at the position.
Rotation Angle
Specify the counterclockwise rotational angle about the position the Rotation field.
Layers
Layers can be used to create sandwich primitives by adding layers on one or more sides. This is especially useful when specifying artificial domains in the physics, such as Infinite Element Domains and Perfectly Matched Layers. You specify the thicknesses of layers in the Layers table and optionally a name for each layer. The outermost layer comes first. Select the checkboxes to specify where to apply the layers. Each layer must have a minimal thickness (depending on the size of the geometry).
Figure 7-34: Layers added to the sides of the square to be specified as Absorbing Layer. The plot shows a Gaussian pulse in a 2D uniform flow.
Selections of Resulting Entities
Select the Resulting objects selection checkbox to create predefined selections (for all levels — objects, domains, boundaries, edges, and points — that are applicable) in subsequent nodes in the geometry sequence. To also make all or one of the types of resulting entities (domains, boundaries, edges, and points) that the square consists of available as selections in all applicable selection lists (in physics and materials settings, for example), choose an option from the Show in physics (Show in instances if in a geometry part; Show in 3D in a plane geometry under a work plane in a 3D component) list: All levels, Domain selection, Boundary selection, Edge selection, or Point selection. The default is Domain selection, which is suitable for use with materials and physics defined in domains. For use with a boundary condition, for example, choose Boundary selection. These selections do not appear as separate selection nodes in the model tree. Select Off to not make any selection available outside of the geometry sequence. From the Color list, choose a color for highlighting the resulting objects selection. See Selection Colors.
When the Layers table is nonempty, select the Create layer selections checkbox to create predefined domain selections for each specified layer and for the core domain. To also make the domains available as selections in all applicable selection lists (in physics and materials settings, for example), select the Show in physics (Show in instances if in a geometry part or Show in 3D if in a Plane Geometry) checkbox (ON by default).
Cumulative Selection
If you want to make the resulting entities contribute to a cumulative selection, select a cumulative selection from the Contribute to list (the default, None, gives no contribution), or click the New button to create a new cumulative selection (see Cumulative Selections).
Assigned Attributes
Select the Construction geometry checkbox to make the resulting objects available only in the feature’s geometry sequence. For more information, see Construction Geometry.