### 25.2.9. Frame Motion Settings

The options are:

- Stationary

- Rotating

  You can specify a constant angular velocity for the coordinate frame by setting Option to `Rotating` and specifying a (constant) value (which could be in the form of a CEL expression) for the Angular Velocity. You will also have to specify a stationary axis about which the rotation occurs, using the Axis Definition settings.

  A boundary condition can use a rotating coordinate frame as its local frame of reference in order to cause an applied profile (for example, a pressure profile) to move.

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