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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 Frozen Areas for Topology Optimization</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 define element groups as the frozen area to maintain material in certain parts of
the design area, such that they remain unchanged in the optimized model.
</span>

</p>
<p>This task shows you how to:
					</p><ul><li><a href = "#tso-t-user-TopOpt-DesArea-ManufCond-frozArea-gui" id = "toc_rg" title = "">
Define a Frozen Area 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></table></td></tr></table>




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<article class = "topic task nested1" aria-labelledby = "ariaid-title2" lang = "en" id = "tso-t-user-TopOpt-DesArea-ManufCond-frozArea-gui">
<h2 class = "title topictitle2">
Define a Frozen Area in <span class = "ph">Tosca Structure.gui</span>
</h2>

<div class = "body taskbody">
<section id = "tso-t-user-TopOpt-DesArea-ManufCond-frozArea-gui__steps_A3C792E0D4434CCD900A59D504E05F3D"><ol class = "ol steps" id = "tso-t-user-TopOpt-DesArea-ManufCond-frozArea-gui__steps_A3C792E0D4434CCD900A59D504E05F3D"><li class = "li step stepexpand">

To define a frozen area, choose <span class = "ph menucascade"><span class = "ph uicontrol">Command</span><abbr title = "and then"> &gt; </abbr><span class = "ph uicontrol">DVCON_TOPO</span></span> in the <span class = "ph">Tosca Structure.pre</span>
screen.

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

Name the
element group that is to be frozen in the <span class = "ph uicontrol">ID_NAME</span>
field. If the element group is not already defined, it is necessary to
define it in advance using the <code class = "ph codeph">GROUP_DEF</code> command.

</li><li class = "li step stepexpand" id = "tso-t-user-TopOpt-DesArea-ManufCond-frozArea-gui__step_2771BDC8E0F24A238C666BA45FAAA66B">

As <span class = "ph uicontrol">Type</span>, select <span class = "ph uicontrol">Frozen</span>.<br/><img class = "image" id = "tso-t-user-TopOpt-DesArea-ManufCond-frozArea-gui__image_22E60FDFDDA14A11BE158AA3DD4F5573" src = "../TsoUserImages/topo_DVCON_TOPO_dialog.png" width = "400"/><br/>

<div class = "itemgroup stepresult">
<p> The resulting command looks like:</p>
<pre class = "codeblock">
<code class = "ph codeph">
DVCON_TOPO
ID_NAME    = frozen_area
EL_GROUP   = frozen_grp
CHECK_TYPE = FROZEN
END_
</code>
</pre>
<p>
This constraint for the design variables is activated when it is referenced
in the <code class = "ph codeph">OPTIMIZE</code> command.
</p>
</div>
</li></ol></section>
</div>

</article>
	

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