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These subnodes are described in the Structural Mechanics Module User’s Guide:
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For Specify direction, enter a value or expression for eg. The default is (0, 0, 1). The direction is specified in the selected coordinate system.
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For Select a parallel edge, an edge can be selected on the Gear Axis subnode, which is added automatically. The vector from the first to last end of the edge is used to define the gear axis. Any edge in the model can be used. Select the Reverse direction check box to reverse the direction of the gear axis.
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For Center of mass, the center of rotation is taken as the center of mass of the gear.
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For Centroid of selected entities select an Entity level — Boundary, Edge, or Point. The available choices depend on geometrical dimension. The center of rotation is located at the centroid of the selected entities, which do not need to be related to rigid domain itself. As a special case, you can select a single point and thus use that point as center of rotation.
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When chosen, a default Center of Rotation: Boundary, Center of Rotation: Edge, or Center of Rotation: Point subnode is automatically added.
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When From physics interface node is selected, initial values for rigid body displacement, rotation, and velocities are inherited from the physics interface level.
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When Locally defined is selected, an Initial Values subnode is automatically added, in which you can initialize the rigid domain degrees of freedom.
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