Only one storage location for center of rotation, the last one encountered is used for all centers. These two lines define the location of the actuator disk or screen. Otherwise, it is assumed that the change occurs over the entire boundary. LAST may be used for the last index. ALL Equivalent to 1 LAST .
Screens require setting the power to zero.
This defines the turning accomplished by the rotor. This would correspond to constant work across the rotor. P tinf - loss at the center of the vortex. A o is the open area. The screen model is not intended for use with choked screens, where the screen is significantly limiting the mass flow rate.