MOVING WALL EFFECT IN RELATION TO OTHER DYNAMIC STALL FLOW MECHANISMS

An analysis is performed to determine the importance of the so-called moving wall effect relative to other unsteady now mechanisms present i n the dynamic stall process. Analysis of existing theoretical and expe rimental results indicates that the tangential moving wall effect on t he initial boundary-layer development, close to the flow stagnation po int, is not satisfactorily represented in current numerical methods. T he analysis shows that this moving wall effect plays a dominant role i n inducing self-excited oscillations, such as the wing rock of advance d aircraft, and also plays a significant role in so-called supermaneuv ers of these aircraft.