LINK_BEAD

Defines link conditions (coupling conditions) for nodes in bead optimization.

This page discusses:

ID_NAME

= <id_name_of_link_bead>

Name of LINK_BEAD definition.

CS

= <name_of_coord_system>

Name of the coordinate system in which the link condition is defined. Only Cartesian coordinate systems are allowed.

TYPE

 Type of link condition

= PLANE_SYM

A symmetrical displacement of the nodes referring to the plane that lies normal to the given axis of the coordinate system.

= POINT_SYM

A symmetrical displacement of the nodes referring to the origin of the coordinate system is enforced.

= ROTATIONAL_SYM

= ROTATIONAL_SYM, AXIS_1

= ROTATIONAL_SYM, AXIS_2

= ROTATIONAL_SYM, AXIS_3

A rotational symmetric displacement of the nodes referring to the given axis of the coordinate system is enforced. Instead of AXIS_1, AXIS_2 or AXIS_3, it is possible to use CLIENT_DIR to specify the axis.

= SURF_TURN

Preserve a turnable surface. The rotation axis is defined by the coordinate system axis.

CLIENT_DIR

= <X_1>, <X_2>, <X_3>

Direction of the axis for the restrictions PLANE_SYM, ROTATIONAL_SYM or SURF_TURN with reference to the specified coordinate system.

MAIN

 Determination of the main node

= NDGR, <node_group>

The group specified for the MAIN item drives the optimization. It is only allowed for TYPE = SURF_TURN. The optimization displacements of the main nodes are applied on the other DVCON->ND_GROUP nodes.

Remarks

  1. When using LINK_BEAD, the geometry of the model must be symmetric. However, the underlying mesh might be asymmetric in some cases.
  2. For bead sensitivity, only LINK_BEAD with TYPE = PLANE_SYM or TYPE = SURF_TURN are allowed. All other TYPEs are only allowed for bead controller.

Examples

LINK_BEAD
  ID_NAME    = my_link_01
  CS         = cs_1
  TYPE       = PLANE_SYM
  CLIENT_DIR = 1.0, 1.0, 0.0
END_