mirror of
https://git.salome-platform.org/gitpub/modules/smesh.git
synced 2024-11-12 00:29:17 +05:00
86 lines
3.5 KiB
Plaintext
86 lines
3.5 KiB
Plaintext
/*!
|
|
|
|
\page adding_quadratic_elements_page Adding Quadratic Elements
|
|
|
|
\n MESH module allows you to work with <b>Quadratic Elements</b>.
|
|
|
|
Quadratic elements are defined by the same corner nodes as the
|
|
corresponding linear ones, but in addition they have \a midside nodes
|
|
located between the corner nodes on element sides.
|
|
|
|
If a quadratic 2D element has an additional node at the
|
|
element center, it is a bi-quadratic element (both TRIA7 and
|
|
QUAD9 elements are supported). If a quadratic hexahedral element has 7
|
|
additional nodes: at the element center and at the center of each
|
|
side, it is a tri-quadratic element (or HEXA27).
|
|
|
|
The convention of nodal connectivity of elements used in SALOME is
|
|
the MED library convention. You can consult the description of nodal
|
|
connectivity of elements in the documentation on MED library or
|
|
\ref connectivity_page "here".
|
|
|
|
There are several ways to create quadratic elements in your mesh:
|
|
- manually (this way is described below);
|
|
- use \ref quadratic_mesh_anchor "Quadratic Mesh" hypothesis to
|
|
generate a quadratic mesh on your geometry;
|
|
- convert an existing linear mesh to a quadratic one
|
|
(see \ref convert_to_from_quadratic_mesh_page).
|
|
|
|
<em>To add a quadratic element to your mesh:</em>
|
|
<ol>
|
|
<li>Select your mesh in the Object Browser or in the 3D viewer.</li>
|
|
|
|
<li>From the \b Modification menu choose the \b Add item and select
|
|
one of the following:
|
|
|
|
\image html image152.png
|
|
|
|
\note All dialogs for adding quadratic element to the mesh
|
|
provide the possibility to automatically add an element
|
|
to the specified group or to create the group anew using
|
|
<b>Add to group</b> box, that allows choosing an existing group for
|
|
the created node or element or giving the name to a new group. By
|
|
default, the <b>Add to group</b> check box is switched off. If the user
|
|
switches this check box on, the combo box listing all currently
|
|
existing groups of the corresponding type becomes available. By
|
|
default, no group is selected. In this case, when the user presses
|
|
<b>Apply</b> or <b>Apply & Close</b> button, the warning message box
|
|
informs the user about the necessity to input a new group name. The
|
|
combo box lists groups of all the
|
|
\ref grouping_elements_page "three types": both
|
|
\ref standalone_group "standalone groups",
|
|
\ref group_on_filter "groups on filter", and
|
|
\ref group_on_geom "groups on geometry". If the user chooses a
|
|
group on geometry or on filter, he is warned and proposed to
|
|
convert this group to standalone.
|
|
If the user rejects conversion operation, it is cancelled and
|
|
a new quadratic element is not created.
|
|
|
|
|
|
To create any <b>Quadratic Element</b> specify the nodes which will
|
|
form your element by selecting them in the 3D viewer with pressed
|
|
Shift button and click \a Selection button to the right of
|
|
<b>Corner Nodes</b> label. Their numbers will appear in the dialog box
|
|
as <b>Corner Nodes</b> (alternatively you can just input numbers in
|
|
this field without selection; note that to use this way the mesh
|
|
should be selected before invoking this operation). The edges formed
|
|
by the corner nodes will appear in the table. To define the middle
|
|
nodes for each edge, double-click on the respective field and input
|
|
the number of the node (or pick the node in the viewer). For
|
|
bi-quadratic and tri-quadratic elements, your also need to specify
|
|
central nodes.
|
|
As soon as all needed nodes are specified, a preview of a new
|
|
quadratic element will be displayed in the 3D viewer. Then
|
|
you will be able to click \b Apply or <b>Apply and Close</b> button to
|
|
add the element to the mesh.
|
|
|
|
\image html aqt.png
|
|
|
|
\b Reverse button reverses the element.
|
|
</li>
|
|
</ol>
|
|
|
|
|
|
|
|
*/
|