Boundary Condition
The Boundary Condition node () defines a feature that can only exist (have selections) on one level below the geometric entity level of the physics.
To add a Boundary Condition:
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On the Physics Interface toolbar, click the Boundary Condition button ().
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Under Building Blocks, right-click Features and add it from the context menu.
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Right-click the Physics Interface or Multiphysics Interface nodes to add this from the Features submenu.
The Settings window is almost identical to the Generic Feature, except that it does not include the Supported geometric entity levels list.