Block Format Keyword

/INIVEL/AXIS - Initial velocities for translating and rotating components

Description

Initialize both translational and rotational velocities on a group of nodes in a given coordinate system.

Field	Contents	SI Unit Example
inivel_ID	Initial velocity block identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
inivel_axis_title	Initial velocity block title (Character, maximum 100 characters)
Dir	Direction X, Y, and Z of the frame defining the rotation axis (Text)
frame_ID	Frame identifier. frame_ID is obligatory input. If not given, the initial velocities are applied with respect to the global coordinate system. (Integer)
grnd_ID	Node group on which specified initial velocities are applied (Integer)
Vxt	X component in the local frame of the translational velocity (Real)
Vyt	Y component in the local frame of the translational velocity (Real)
Vzt	Z component in the local frame of the translational velocity (Real)
Vr	Rotational velocity about the rotational axis (Real)

1.	The keyword defines initial rigid body type of motion (translational and rotational) of a group of nodes (for example, initial velocity for rollover simulation of a vehicle).

2.	The initial nodal velocity is calculated as:

inivel_axis_eq

Where,

U is the vector defining the rotation axis.

O is the center of the local coordinate system and M is the nodal point.

Vr is the rotation velocity

Vt is the vector of translational velocity

3.	This option cannot be used when /INIVEL/TRA or /INIVEL/ROT is applied on the same node.

/INIVEL/AXIS