Boundary Feature
The Boundary Feature node () defines a feature that can only exist (have selections) on the boundary geometric entity level of the current space dimension, which represents surfaces in 3D, lines in 2D, and points in 1D.
To add a Boundary Feature:
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On the Physics Interface toolbar, select it from the More Features menu.
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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.