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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>Identifying Surface Nodes for Shape 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">The identification of surface nodes is necessary for shape
optimization. During the optimization preprocessing the surface nodes
are automatically identified when the design variables are defined (<code class = "ph codeph">DV_SHAPE</code>).</span>

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</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 = "Definition of the design nodes for shape optimization." href = "../TsoCmdMap/tso-r-cmd-dvShape.htm#tso-r-cmd-dvShape">DV_SHAPE</a></td></tr><tr><td><a title = "Determines the attributes (nodal boundary conditions) of the FE model that should be loaded in TOSCA_PREP and TOSCA_OPT and which other actions should be considered during loading (for example, automatic determination of the surface nodes). This command must be defined before the FEM_INPUT command in the parameter file to be known during model import." href = "../TsoCmdMap/tso-r-cmd-options.htm#tso-r-cmd-options">OPTIONS</a></td></tr><tr><td><a title = "Identification and marking of all surface nodes of the active nodes. The nodes can be addressed with the SELECT command due to this marking." href = "../TsoCmdMap/tso-r-cmd-sfIdent.htm#tso-r-cmd-sfIdent">SF_IDENT</a></td></tr></table></td></tr></table>




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<p>The surface nodes can already be identified when reading the analysis
model, such that a selection of the surface nodes is possible for the
definition of groups. When using the parameter <code class = "ph codeph">READ_SF_IDENT
= ON</code> in the <code class = "ph codeph">OPTIONS</code> command, all surface nodes
are identified and can be used for further definitions.</p>
<p>In certain cases, problems can occur in the surface node recognition
for the whole model. In these cases, only the elements should be selected
which are meant to be assigned with the surface nodes. For example, if
shells lie on the surface of solid elements, only the free boundary of
the shell is identified as being a surface. In this case, the solid elements
must be selected (command <code class = "ph codeph">SELECT</code>) and their surface
nodes must be identified with the command <code class = "ph codeph">SF_IDENT</code>.
The command <code class = "ph codeph">SF_IDENT</code> can only be used once.</p>
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