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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>Group Definition 
(GROUP_DEF, GROUP_AUTO_DEF)</h1></td></tr><tr><td class = "DocHeader4" colspan = "2"/></tr><tr><td class = "DocHeader3" colspan = "2"><table class = "DocThemeIntro" id = "table12"><tr><td class = "Intro1"><p class = "header"><p class = "abstract">
    <span class = "shortdesc">The definition of groups is a very important function in <span class = "ph">SIMULIA Tosca Structure</span>.
For example, if one or more nodes should be assigned a specific attribute
(for example, a restriction), the nodes are first assembled in an object <span class = "ph">node
group</span>. Then the attribute is assigned to the object <span class = "ph">node group</span>.
</span>

    <p>In <span class = "ph">SIMULIA Tosca Structure</span>
two different types of  groups exist: node groups and element groups.
Groups can be defined manually using selection of objects or using lists
in <span class = "ph">Tosca Structure.gui</span>.
Further, automatic node group definition is available to define groups
following specific geometric patterns like, for example, on surfaces of revolution.
All groups from the FE input file(s) linked to the optimization task
are also available for definitions in <span class = "ph">SIMULIA Tosca Structure</span>. Groups
are uniquely defined and addressed with their user-defined names (character
string). The use of an identical name for a node group and an element
group is not permitted.</p>
  </p>

</p><hr class = "header"/></td></tr><tr><td class = "Intro2"><span class = "run-in">In this section:</span><br/><ul class = "ulthemes"><li><a title = "The system automatically creates a node group named ALL_NODES and an element group named ALL_ELEMENTS. All nodes and elements respectively that have been loaded with the first file in the FEM_INPUT command are contained in these groups. However, nodes (or elements) loaded from all other files are not contained in the ALL_NODES (ALL_ELEMENTS) group." href = "tso-c-usr-model-defaultGroupDef.htm">Default Predefined Groups</a></li><li><a title = "This section describes details to each front end." href = "tso-c-usr-model-groupDefDetailed.htm">Group Definition in Detail</a></li><li><a title = "Apart from the definition of individual node groups, several node groups can be defined automatically using the GROUP_AUTO_DEF command. The GROUP_AUTO_DEF command is available from the command menu in Tosca Structure.gui." href = "tso-c-usr-model-autoNodeGroupDef.htm">Automatic Node Group Definition (GROUP_AUTO_DEF)</a></li></ul></td></tr></table></td></tr></table>
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