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<a name = "hj-top"> </a><table class = "table1" id = "table11"><tr><td><table class = "DocHeader"><tr><td class = "DocHeader1" colspan = "2"><h1>  Defining Symmetry Conditions</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3"><table class = "DocHeaderIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "header"><p class = "abstract">
<span class = "shortdesc">
You can use different Symmetry Conditions for obtaining symmetrical results using nonsymmetrical
meshes, saving the processing time for the FE-calculation. In addition,
symmetrical <span class = "ph">load case</span>
can often be reduced in the FE model.
</span>

<p>
<table class = "Remark" id = "table132"><tr><td class = "Remark"><span class = "run-in.important">Important:
				</span><span class = "notecontent">
The FE meshes do not must be symmetric. The restriction can also
be applied to unstructured meshes or to tetrahedron meshes. The elements
should have nearly the same size because the result is the resolution
of the coarsest part of the mesh. It is possible that the linked elements
are not determined correctly if the size of the elements differs too
much.
</span></td></tr></table>

</p>
</p>
<p>This task shows you how to:
					</p><ul><li><a href = "#tso-t-user-TopOpt-DesArea-SymCon-gui" id = "toc_rg" title = "">
Define Symmetry Conditions in <span class = "ph">Tosca Structure.gui</span>
</a></li></ul>
</p></td></tr></table></td><td class = "DocHeader2"><table class = "DocTopicsSeeAlso" id = "table13"><tr><td class = "TopicsTitle">See Also</td></tr></table><table class = "DocTopicsInOtherGuides" id = "table14"><tr><td height = "8px"/></tr><tr><td class = "TopicsTitleNormal">In Other Guides</td></tr><tr><td><a title = "Defines restrictions of the design variables in topology optimization." href = "../TsoCmdMap/tso-r-cmd-dvconTopo.htm#tso-r-cmd-dvconTopo">DVCON_TOPO</a></td></tr><tr><td><a title = "Definition of symmetry and link conditions for topology optimization." href = "../TsoCmdMap/tso-r-cmd-linkTopo.htm#tso-r-cmd-linkTopo">LINK_TOPO</a></td></tr></table></td></tr></table>




<div class = "related-links"/>

<article class = "topic task nested1" aria-labelledby = "ariaid-title2" id = "tso-t-user-TopOpt-DesArea-SymCon-gui">
<h2 class = "title topictitle2">
Define Symmetry Conditions in <span class = "ph">Tosca Structure.gui</span>
</h2>

<div class = "body taskbody">
<section><ol class = "ol steps"><li class = "li step stepexpand">

Choose <span class = "ph menucascade"><span class = "ph uicontrol">Command</span><abbr title = "and then"> &gt; </abbr><span class = "ph uicontrol">LINK_TOPO</span></span>.

</li><li class = "li step stepexpand">

In the LINK_TOPO menu, define the type of symmetry,
the coordinate system and, if necessary, the rotation angle (in case
of rotation symmetry) or the translation distance (in case of cyclic
symmetry).

</li><li class = "li step stepexpand">

The symmetry definition can also be extended to frozen areas
by selecting the corresponding checkbox.

<p>
The frozen elements of one area are also considered as frozen for
the linked areas, if the <span class = "ph uicontrol">Frozen</span> checkbox is checked.
</p>
</li><li class = "li step stepexpand">

Select <span class = "ph menucascade"><span class = "ph uicontrol">Command</span><abbr title = "and then"> &gt; </abbr><span class = "ph uicontrol">DVCON_TOPO</span></span>.

</li><li class = "li step stepexpand">
In the DVCON_TOPO dialog, apply the defined LINK_TOPO to an element group  as shown in the following figure:
<p>
<br/><img border = "1" class = "image" id = "tso-t-user-TopOpt-DesArea-SymCon-gui__image_DF5FF9B8596B4AA0B43F55F8E7A0CC39" src = "../TsoUserImages/ag096e41.jpg" width = "450"/><br/>
</p>
</li><li class = "li step stepexpand">
The corresponding parameter file looks like:
<div class = "itemgroup stepresult">
<pre class = "codeblock">
<code class = "ph codeph">
LINK_TOPO
  ID_NAME     = &lt;Name of LINK_TOPO object&gt;
  CS          = &lt;Name of the reference coordinate system&gt;
  TYPE        = &lt;Type of symmetry&gt;, &lt;axis&gt;
  TRANSLATION = &lt;Translation for cyclic symmetry&gt;
  ANGLE       = &lt;Segment angle for rotation symmetry&gt;
END_

DVCON_TOPO
  ID_NAME     = &lt;Name of DVCON_TOPO object&gt;
  EL_GROUP    = &lt;Element group to be restricted&gt;
  CHECK_TYPE  = LINK_TOPO
  CHECK_LINK  = &lt;Name of LINK_TOPO definition&gt;
END_
</code>
</pre>
<p> More than one symmetry condition can be defined for an element group. Geometrically, different
              combinations must be feasible. </p>
</div>
</li></ol></section>
</div>

</article>
	

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