Prescribed Velocity
The Prescribed Velocity 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.
Coordinate System Selection
Specify the coordinate system to use for specifying the prescribed translational/rotational velocity. See the section Coordinate System Selection for Edge Load. Depending on the selected coordinate system, the velocity components change accordingly.
Prescribed Velocity
Select one or all of the Prescribed in x direction, Prescribed in y direction, and for 3D models, Prescribed in z direction 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.
Prescribed Velocity can not be used as a weak constraint.
Location in User Interface
Context Menus
Beam>Line Constraints>Prescribed Velocity
Beam>More Constraints>Prescribed Velocity (Point)
Ribbon
Physics tab with Beam selected:
Edges>Line Constraints>Prescribed Velocity
Points>More Constraints>Prescribed Velocity