Applying Initial DOF Rotational Velocities

You can apply an initial DOF rotational velocity to prescribe a rotational velocity about each node in the rotational x-, y-, or z-direction.

This type of rotation occurs about each node in the meshed model, not around an axis. To define an angular velocity about an axis or line, use the more general-purpose Initial Velocity initial condition.

Unlike a velocity load, which typically ramps up in magnitude over the course of a step, an initial velocity is applied instantaneously at the start of the simulation.

See Also
About Initial DOF Rotational Velocities
Applying Initial Velocities
In Other Guides
Creating Simulation Features
Feature Positioning Tools
  1. From the Initial Conditions section of the action bar, click Initial DOF Rotational Velocity .
  2. Optional: Enter a descriptive Name.
  3. Select the geometry supports in the model.

    An initial DOF rotational velocity can be applied to one or more bodies. You can also select a coupling connection, rigid body, or rigid surface; the velocity is applied to the reference point for the feature.

  4. Select one of the following as the Axis system definition:
    OptionDescription
    Global Aligns the local feature triad with the global coordinate system.
    Local Aligns the local feature triad with a selected axis system in the model. If you select this axis system, you must also specify it by selecting it in the model or in the tree.
    Specify Orients the local feature triad directly. Right-click the feature triad glyph on the model, and select an orientation tool.
    ImplicitAligns the axis system to the transformed axis system applied on the support.
  5. Select a Degree of freedom representing the axis of rotation for the velocity.
  6. Enter the Rotational velocity magnitude.
  7. Click OK.