Connecting Parts
The most important feature for connecting part is a joint. A joint will in general allow relative movement between two parts in one or more degrees of freedom. This is described in detail in the Joints section.
It is also possible to connect parts by springs and dampers, as described in the Springs and Dampers section.
A part can be connected to several joints, springs, or dampers. The way to attach them differs between a rigid and a flexible object.
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A flexible body must be connected through an attachment, as described in the Attachments section. Add an Attachment node to the model and select the attached boundaries. The attachment is then referenced in, for example, a joint.
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A rigid domain can be connected directly, by just specifying the location of the connection. The connection point does not even have to physically inside the rigid domain since the domain can be considered as an abstract object.
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A rigid domain can also be connected by an attachment. This is convenient if you consider switching between a rigid and a flexible formulation for this domain.
A rigid domain can consist of a selection of several geometrical domains. These domains will act as a single rigid object, irrespective of whether they are geometrically connected or not.
Adjacent domains selected in different Rigid Material nodes are independent objects, and can even penetrate each other.