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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>Optimizer Parameters</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1Only"><p class = "header"><p class = "abstract">
<span class = "shortdesc">The mathematical optimizer CSA is used to determine the new nodal positions. </span>

</p>
<p>This page discusses: </p><ul><li><a href = "#tso-c-usr-beadParamSens-beadOpt__tso-c-usr-beadParamSens-beadOpt-noadlMove" id = "toc_rg" title = "">Move Limit (NODAL_MOVE)</a></li><li><a href = "#tso-c-usr-beadParamSens-beadOpt__tso-c-usr-beadParamSens-beadOpt-NodalUpdate" id = "toc_rg" title = "">CSA Asymptote Update (NODAL_UPDATE)</a></li><li><a href = "#tso-c-usr-beadParamSens-beadOpt__tso-c-usr-beadParamSens-beadOpt-DesNodes" id = "toc_rg" title = "">Sensitivity Calculation (ONLY_DES_NODES)</a></li></ul>
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<div class = "body conbody">
<p>The following parameters might be set:</p>

<div class = "section" id = "tso-c-usr-beadParamSens-beadOpt__tso-c-usr-beadParamSens-beadOpt-noadlMove"><h2 class = "title sectiontitle">Move Limit (NODAL_MOVE)</h2>

<p>A move limit adjusts the change in the nodal coordinates
per iteration. The relative move limit of the node-based optimization displacement
for each iteration is set by the optimization parameter. </p>
<pre class = "codeblock">
<code class = "ph codeph">
NODAL_MOVE = &lt;real_value&gt;
</code>
</pre>
<p>Default value is <code class = "ph codeph">NODAL_MOVE =  0.1</code>. The value must be between
0.0 and 1.0. The absolute move limit is the maximum possible optimization
displacement times <code class = "ph codeph">NODAL_MOVE</code>.</p>
</div>

  
<div class = "section" id = "tso-c-usr-beadParamSens-beadOpt__tso-c-usr-beadParamSens-beadOpt-NodalUpdate"><p><map name = "FPMap1"><area href = "#hj-top" title = "Back to Top" shape = "rect" coords = "416, 0, 435, 10"/></map><span class = "itemsprite"/></p><h2 class = "title sectiontitle">CSA Asymptote Update (NODAL_UPDATE)</h2>

<p>The optimization parameter <code class = "ph codeph">NODAL_UPDATE</code> can
be used to control the update of asymptotes in CSA. The value of nodal
update might be conservative (<code class = "ph codeph">NODAL_UPDATE = CONS</code>) which is default
or normal (<code class = "ph codeph">NODAL_UPDATE = NORM</code>). </p>
<p><table class = "Remark" id = "table132"><tr><td class = "Remark"><span class = "run-in.important">Important:
				</span><span class = "notecontent">Only advanced users should change this parameter.</span></td></tr></table>
</p>
</div>

  
<div class = "section" id = "tso-c-usr-beadParamSens-beadOpt__tso-c-usr-beadParamSens-beadOpt-DesNodes"><p><map name = "FPMap1"><area href = "#hj-top" title = "Back to Top" shape = "rect" coords = "416, 0, 435, 10"/></map><span class = "itemsprite"/></p><h2 class = "title sectiontitle">Sensitivity Calculation (ONLY_DES_NODES)</h2>

<p><span class = "ph">Tosca Structure.bead</span>
calculates sensitivities only for design nodes:</p>
<pre class = "codeblock">
<code class = "ph codeph">
ONLY_DES_NODES = YES
</code>
</pre>
<p>In the opposite case (<code class = "ph codeph">ONLY_DES_NODES = NO</code>), 
   <span class = "ph">Tosca Structure</span>
   is forced to calculate sensitivities for <code class = "ph codeph">ALL_NODES</code>, which is not recommended.</p>
<p><table class = "Remark" id = "table132"><tr><td class = "Remark"><span class = "run-in.important">Important:
				</span><span class = "notecontent">Only advanced users should change this parameter.</span></td></tr></table>
</p>
</div>

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