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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>About Frozen Areas</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">Sometimes it is required to maintain material in certain parts of
the design area, such that they remain unchanged in the optimized
model. Element groups describing these parts can be defined as
frozen area. 
</p></td></tr></table></td><td class = "DocHeader2"><table class = "DocTopicsSeeAlso" id = "table13"><tr><td class = "TopicsTitle">See Also</td></tr><tr><td><a title = "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." href = "tso-t-user-TopOpt-DesArea-ManufCond-frozArea.htm#tso-t-user-TopOpt-DesArea-ManufCond-frozArea">Defining Frozen Areas for Topology Optimization</a></td></tr></table></td></tr></table>
  

  

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    <p>Frozen areas are used to exclude the so-called frozen
elements from being modified during the optimization, even though
these elements are included in the design space. This is the case,
for example, when the elements are used in order to fix the component and
therefore should be preserved independently of their internal
loads. The inclusion into the design space might be necessary, for example,
to control the target volume (see constraints "absolute volume" or
"relative volume", Bd.1, Chapter 5.5.1).

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