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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 a Tightness Restriction in <span class = "ph">Tosca Structure.gui</span></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 = "shortdesc">
You can define a tightness restriction to prevent the remaining structure from having holes and breakouts
in the defined restriction area.

</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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<section><ol class = "ol steps"><li class = "li step">

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 <span class = "ph">Tosca Structure.pre</span>.

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Define the restriction as shown in the following figure: <br/><img class = "image" id = "tso-t-user-TopOpt-DesArea-TighCon__image_255D44D1514C4206B7154A652044BBC5" src = "../TsoUserImages/ag096a7f.jpg" width = "450"/><br/>

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