Block Format Keyword Defines rigid bodies using Lagrange multipliers. This keyword is not available for SPMD computation.


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node_ID           grnd_ID      
Blank Format
Blank Format


Field Contents SI Unit Example
rbody_ID Rigid body identifier.

(Integer, maximum 10 digits)

unit_ID Unit Identifier.

(Integer, maximum 10 digits)

rbody_title Rigid body title.

(Character, maximum 100 characters)

node_ID Main (primary) node identifier.


grnd_ID Secondary nodes group identifier.




  1. The main (primary) and secondary nodes must have non-zero mass and inertia.
  2. The main (primary) node is not moved to the center of gravity of the body.
  3. All nodes are equivalent (no distinction between main and secondary nodes in this formulation) and may have other kinematical conditions of Lagrange Multiplier type.