Prescribed Velocity

The node adds an edge (3D), boundary (2D), or point (2D and 3D) that prescribes the translational or rotational velocity in one or more directions. The prescribed velocity condition is applicable for Time Dependent and Frequency Domain studies. With this condition it is possible to prescribe a velocity in one direction, leaving the beam free in the other directions.

The Prescribed Velocity node is a constraint, and overrides any other constraint on the same selection.


	For details about prescribed velocities and accelerations, see Prescribed Displacements, Velocities, and Accelerations.

Coordinate System Selection


	Coordinate systems with directions that change with time should not be used.

Specify the coordinate system to use for specifying the prescribed translational/rotational velocity. See the section for Edge Load. Depending on the selected coordinate system, the velocity components change accordingly.

Prescribed Velocity

Select one or all of the ,, and for 3D models, check boxes. Then enter a value or expression for vx, vy, and for 3D models, vz.

Prescribed Angular Velocity


	For 2D models, to define a prescribed angular velocity select the Prescribed in out of plane direction check box and enter a value or expression for ∂θ0z/∂t.


	For 3D models, to define a prescribed angular velocity for each space direction (x, y, and z), select one or all of the Prescribed around x direction, Prescribed around y direction, and Prescribed around z direction check boxes and enter a value or expression for in each ∂θ0x/∂t, ∂θ0y/∂t, or ∂θ0z/∂t field.


	You can add a Harmonic Perturbation subnode for specifying a harmonic variation of the values of the prescribed velocity in a frequency domain analysis of perturbation type.

Location in User Interface

Context Menus

(Point)

Ribbon

Physics tab with selected: