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.