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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.