Boundary, Edge, Point, and Pair Nodes for the Pipe Mechanics Interface
The Pipe Mechanics Interface has these boundary, edge, point, and pair nodes available from the Physics ribbon toolbar (Windows users), Physics context menu (Mac or Linux users), or right-click to access the context menu (all users).
In general, to add a node, go to the Physics toolbar, no matter what operating system you are using. Subnodes are available by clicking the parent node and selecting it from the Attributes menu.
Features Available from Submenus
Many features for the Pipe Mechanics interface are added from submenus in the Physics toolbar groups or context menu (when you right-click the node). The submenu name is the same in both cases.
The submenus at the Edge level (3D) or Boundary level (2D) are
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 Material Models
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 Line and Volume Loads
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 Mass, Spring, and Damper
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 Line Constraints
The submenus at the Point level are
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Connections
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 Mass, Spring, and Damper
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 More Constraints
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 Pairs
Links to Feature Node Information
These nodes (and subnodes) are described in this section (listed in alphabetical order):
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Bend
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Fluid and Pipe Materials
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Fluid Load
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Gravity
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Pipe Cross Section
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Rigid Material
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Section Orientation
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Thermal Expansion (for Materials)
These nodes are described for the Beam interface:
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Antisymmetry
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Edge Load
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External Stress
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Initial Stress and Strain
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Initial Values
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No Rotation
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Pinned
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Point Load
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Point Load, Free
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Point Mass
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Point Mass Damping
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Prescribed Acceleration
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Prescribed Displacement/Rotation
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Prescribed Velocity
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Rigid Connector
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Symmetry
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Thermal Expansion (for Constraints)
These nodes are described for the Solid Mechanics interface:
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Added Mass
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Center of Rotation Nodes
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Damping
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Fixed Constraint
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Free
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Predeformation
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Safety
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Spring Foundation
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Spring-Damper
If there are subsequent constraints specified on the same geometrical entity, the last one takes precedence. The exception is that the “Pinned” and “No Rotation” boundary conditions do not override each other since the degrees of freedom that they constrain are mutually exclusive.
In the COMSOL Multiphysics Reference Manual see Table 2-4 for links to common sections and Table 2-5 to common feature nodes. You can also search for information: press F1 to open the Help window or Ctrl+F1 to open the Documentation window.