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Subsection 3.10.2: Fixed Nodal Degrees of Freedom Up Section 3.10: Boundary Section Subsection 3.10.4: Linear Constraints

### 3.10.3 Rigid Nodes

A node set can be attached to a rigid body using the rigid boundary condition. Rigid nodes are not assigned degrees of freedom.
<bc type="rigid" node_set="set1">
<rb>2</rb>
</bc>

The rb parameter defines the material (which must be a “rigid body” material) that in turn defines the rigid body. The node set must be defined in the Mesh section.
Subsection 3.10.2: Fixed Nodal Degrees of Freedom Up Section 3.10: Boundary Section Subsection 3.10.4: Linear Constraints