Initially Rigid
Add the Initially Rigid node to enforce that a flexible domain is treated as a rigid body during the initialization of a time-dependent study.
This node has a domain selection and it can be only defined in domains where the Linear Elastic Material model is used. It overrides the Initial Values node and instead defines the initial values of the selected elastic domains itself.
Initial Values
Select From physics interface node or Locally defined.
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When From physics interface node is selected, initial values for rigid body displacement, rotation, and velocities are inherited from the physics interface level.
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When Locally defined is selected, an Initial Values subnode is automatically added, in which you can initialize the rigid domain degrees of freedom.
Select a Consistent initialization — Default or Force initial values to enforce that the exact values given in this node should be maintained through the consistent initialization process. The default when the given initial values are inconsistent is to make them adapt to each other by adjusting all initial values. For Force initial values click to select the applicable check boxes — Translation along first axis, Translation along second axis, Translation along third axis, and Total rotation. Only the selected degrees of freedom have the initial values fixed during the consistent initialization process.
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The optional subnode is the same as for a Rigid Domain, and is described in Initial Values (Rigid Domain).
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For details about the input expressions at the physics interface level, see Initial Values.
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See Rigid Domain Material Model in the Structural Mechanics Module User’s Guide for more information.
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For details about the initialization process, see Initialization in Time-Dependent Studies.
Location in User Interface
Context Menus
 Multibody Dynamics>Initially Rigid
Ribbon
Physics tab with Multibody Dynamics selected:
Domains>Multibody Dynamics>Initially Rigid