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For Center of rotation, the location of the spring is taken as the center of rotation as defined in the parent Rigid Domain node.
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For Centroid of selected entities select an Entity level — Boundary, Edge, or Point. The available choices depend on physics interface and geometrical dimension. The spring is attached 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 attach the spring at that point.
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Once chosen, a default Location: Boundary, Location: Edge, or Location: Point subnode is automatically added.
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In 2D the Spring constant is only a single scalar, representing the stiffness for rotation around the out-of-plane direction. Similarly, the Moment as function of rotation is a single scalar.
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For Scalar (Same for all components) enter a single Loss factor for spring ηu,s, which is used to multiply all values of the spring matrix or spring force vector.
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For Individual components select Isotropic, Diagonal, Symmetric, or Full, then enter values or expressions in the table for the Loss factor for spring ηu,k or ηf based on space dimension. The loss factors act on the corresponding components of the spring matrix or spring force vector. If you select Isotropic, the effect is the same as when you select Diagonal and enter the same value for all diagonal elements.
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