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86 lines
3.5 KiB
Plaintext
86 lines
3.5 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 the same corner nodes as the
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corresponding linear ones, but in addition they have \a midside nodes
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located between the corner nodes on element sides.
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If a quadratic 2D element has an additional node at the
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element center, it is a bi-quadratic element (both TRIA7 and
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QUAD9 elements are supported). If a quadratic hexahedral element has 7
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additional nodes: at the element center and at the center of each
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side, it is a tri-quadratic element (or HEXA27).
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The convention of nodal connectivity of elements used in SALOME is
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the MED library convention. You can consult the description of nodal
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connectivity of elements in the documentation on MED library or
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\ref connectivity_page "here".
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There are several ways to create quadratic elements in your mesh:
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- manually (this way is described below);
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- use \ref quadratic_mesh_anchor "Quadratic Mesh" hypothesis to
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generate a 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 adding quadratic element 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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switches 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 groups of all the
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\ref grouping_elements_page "three types": both
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\ref standalone_group "standalone groups",
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\ref group_on_filter "groups on filter", and
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\ref group_on_geom "groups on geometry". If the user chooses a
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group on geometry or on filter, he is warned and proposed to
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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
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form your element by selecting them in the 3D viewer with pressed
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Shift button and click \a Selection button to the right of
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<b>Corner Nodes</b> label. Their numbers will appear in the dialog box
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as <b>Corner Nodes</b> (alternatively you can just input numbers in
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this field without selection; note that to use this way the mesh
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should be selected before invoking this operation). The edges formed
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by the corner nodes will appear in the table. To define the middle
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nodes for each edge, double-click on the respective field and input
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the number of the node (or pick the node in the viewer). For
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bi-quadratic and tri-quadratic elements, your also need to specify
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central nodes.
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As soon as all needed nodes are specified, a preview of a new
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quadratic element will be displayed in the 3D viewer. Then
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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 reverses the element.
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</li>
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</ol>
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*/
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