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73 lines
3.0 KiB
Plaintext
73 lines
3.0 KiB
Plaintext
/*!
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\page adding_quadratic_elements_page Adding Quadratic Elements
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\n MESH module allows you to work with <b>Quadratic Elements</b>.
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Quadratic elements are defined by same corner nodes as the
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corresponding linear ones, and in addition they bear \a midside nodes
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located between the corner nodes on element sides.
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The quadratic quadrilateral element can bear an additional node at the
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element center, then it is referred as bi-quadratic one (or
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QUAD9). The quadratic hexahedral element can bear 7 additional nodes:
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at the element center and at centers of sides, then it is referred as
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tri-quadratic one (or HEXA27).
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There are several ways you can create quadratic elements in your mesh:
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- manually create quadratic elements (the way described below);
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- use \ref quadratic_mesh_anchor "Quadratic Mesh" hypothesis to
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generate quadratic mesh on your geometry;
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- convert an existing linear mesh to a quadratic one
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(see \ref convert_to_from_quadratic_mesh_page).
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<em>To add a quadratic element to your mesh:</em>
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<ol>
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<li>Select your mesh in the Object Browser or in the 3D viewer.</li>
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<li>From the \b Modification menu choose the \b Add item and select
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one of the following:
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\image html image152.png
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\note All dialogs for quadratic element adding to the mesh
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provide the possibility to automatically add an element
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to the specified group or to create the group anew using
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<b>Add to group</b> box, that allows choosing an existing group for
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the created node or element or giving the name to a new group. By
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default, the <b>Add to group</b> check box is switched off. If the user
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swiches this check box on, the combo box listing all currently
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existing groups of the corresponding type becomes available. By
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default, no group is selected. In this case, when the user presses
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<b>Apply</b> or <b>Apply & Close</b> button, the warning message box
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informs the user about the necessity to input a new group name. The
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combo box lists both \ref standalone_group "standalone groups"
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and \ref group_on_geom "groups on geometry". If the user chooses a
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group on geometry, he is warned and proposed to
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\ref convert_to_standalone "convert this group to standalone".
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If the user rejects conversion operation, it is cancelled and
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a new quadratic element is not created.
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To create any <b>Quadratic Element</b> specify the nodes which will form your
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triangle by selecting them in the 3D viewer with pressed Shift
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button. Their numbers will appear in the dialog box as <b>Corner Nodes</b>
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(alternatively you can just input numbers in this field without
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selection).The edges formed by the corner nodes will appear in the
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table. To define the middle nodes for each edge double-click on the
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respective field and input the number of the node. All edges and the
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object formed by them will be displayed in the Object browser. When
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all edges are defined you will be able to click \b Apply or <b>Apply and Close</b> button to
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add the element to the mesh.
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\image html aqt.png
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\b Reverse button for Quadratic Edges switches the first and the last
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nodes. For all other elements it reverses the element.
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</li>
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</ol>
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*/
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