A New Actuator Disk Model for the TAU Code and Application to a Sailplaine with a Folding Engine

In this paper a new actuator disk is presented which is consistent with the classical model of momentum theory of a zero thickness surface which imposes a discontinous pressure jump to the flow. The topology of the grid maintains fluxes conservative through the disk. The load of the disk is calculated by time averaging the sectional load of a rotating blade. The sectional load is calculated with the blade element theory for a propeller of a sailplaine with a folding engine and the actuator disk is applied to investigate the effect of the jet to the elevator.