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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>Settings of the Mesh Filter</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">Similar to topology optimization

numerical instabilities
resulting in checker-board effects can be controlled using filtering.
</span>

</p>

</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 parameters to control optimization." href = "../TsoCmdMap/tso-r-cmd-optParam.htm#tso-r-cmd-optParam">OPT_PARAM</a></td></tr></table></td></tr></table>




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<p>Checkerboard structures cannot be manufactured in practice. The user
also wants to obtain a mesh-independent result from the optimization.
Due to these demands, <span class = "ph">SIMULIA Tosca Structure</span>
has a filter technique implemented to avoid mesh dependence. A specification
of a filter radius (<code class = "ph codeph">FILTER_RADIUS</code> parameter) is necessary
for applying the filter. If the radius of the filter is not specified,
the optimization is performed without using a filter.
If the given radius is too large, the optimization result will not show a detailed structure. A
small value of the radius leads to a finer structure.</p>
<p><div class = "note"><span class = "run-in.note">Note:
			</span><span class = "notecontent">It is recommended to choose the filter radius equal to twice the mean
element edge length.</span></div>
</p>
<p>The filter radius is defined in <code class = "ph codeph">OPT_PARAM</code> command as follows:</p>
<pre class = "codeblock">
<code class = "ph codeph">OPT_PARAM
  ID_NAME       = optimization_control
  OPTIMIZE      = id_of_optimize
  ...
  FILTER_RADIUS = 5.
END_
</code></pre>
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