This can be done in Workbench without using any APDL commands. Now a Static Structural model will solve without pivot errors. If you pick three nodes around the circle, you can constrain Y=0 and Z=0 and leave X=Free. Put the origin of the Cylindrical coordinate system at the center of the cylindrical surface, and align the Z axis with the axis of the cylinder. If you want to constrain three nodes to ground in a pattern that allows free radial expansion, that is easily achieved by creating a Cylindrical Coordinate System. Where do I start You can start ANSYS from any directory, however it is best to start ANSYS in a directory that is specific to each project or session that way you won’t load up your home directory with the output files that ANSYS creates with each use.
In these commands, specific Degrees of Freedom can be coupled, and these are defined in the nodal coordinate system. In there you will see there is an APDL command CP for Coupling, a CE command for Constraint Equations, an RBE3 command that distributes forces from a master node to a set of slave nodes. Navigate to the Mechanical APDL section and then into Chapter 10: Multipoint Constraints and Assemblies. You ask about a kinematic coupling between a reference node and other nodes.
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