Supports - Zero Gap Guide
You can model this type of support, by setting the topmost drop-down box, Support Type, to Zero-Gap O Support. Unlike the rollerbox support, a zero-gap guide simulates a fully enclosed support, which essentially behaves as a continuous circular contact surface. A schematic of a zero-gap guide is shown in the figure below.
A zero-gap guide may be thought of as a cylindrical sheath positioned around a section of pipe, with the internal diameter of the sheath equal to the external diameter of the pipe section. The zero-gap contact algorithm works by checking the positions of nodes at each solution step for contact with zero-gap guides. If a node comes into contact with a zero-gap guide, appropriate boundary conditions are applied at the node in local axes which are both perpendicular to the longitudinal direction. The node is free to move in the axial direction (subject to frictional restraints) through the zero-gap support, and whenever the node leaves the support, the boundary conditions are removed.
The parameters described above can be specified in the Zero-Gap O Support Data dialog.