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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>Default Predefined Groups </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 system automatically creates a node group named <code class = "ph codeph">ALL_NODES</code>
and an element group named <code class = "ph codeph">ALL_ELEMENTS</code>. All nodes and
elements respectively that have been loaded with the first file in the
<code class = "ph codeph">FEM_INPUT</code> command are contained in these groups. However,
nodes (or elements) loaded from all other files are not contained in
the <code class = "ph codeph">ALL_NODES</code> (<code class = "ph codeph">ALL_ELEMENTS</code>) group.</span>

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<p>If a topology optimization is performed, the element group <code class = "ph codeph">NON_DESIGN</code>
is also generated. This group contains all elements that have not been
defined as design elements. The <code class = "ph codeph">NON_DESIGN</code> group must
be visualized together with the HARD element group to be able to view
the entire structure of the optimized design in the post-processing system.
The groups defined in the FE input model are also loaded by <span class = "ph">Tosca Structure</span>
and therefore can be referenced in the same way as the groups defined
in the parameter file. The names of the groups imported from the input
model remain unchanged, with the following exceptions:</p>
<ul class = "ul">
<li class = "li">if a node group (<code class = "ph codeph">NSET</code>) and an element group (<code class = "ph codeph">ELSET</code>)
have the same names in an <span class = "ph">Abaqus</span>
input model, they get the suffices _NODE and _ELEM respectively. See <a class = "xref" href = "tso-c-usr-solver-abaqus-groups.htm#tso-c-usr-solver-abaqus-groups" title = "Node and element groups are required to define design variables, constraints, and objectives. They are explained within this section.">Node and Element Groups</a>

 for details.</li>
<li class = "li">if the <span class = "ph">Abaqus</span>
input file contains more than one instance of the same part, the group
names are modified as described in <a class = "xref" href = "tso-c-usr-solver-abaqus-files.htm#tso-c-usr-solver-abaqus-files" title = "File formats are explained in this section.">Files and Formats</a>.</li>
</ul>
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