Postbuckling analysis of trusses with various Lagrangian formulations

Abstract

difference between the responses of the two probes proving that the vortices are shed alternately. The reduced frequency of shedding for all the cases vs the angle of attack is plotted in Fig. 4. In this figure we display data obtained from both facilities. There is a very clear dependence of the reduced frequency on the angle of attack. On the other hand, the influence of the Reynolds number is negligible. The evidence presented here indicates that vortices are shed over delta wings at high angles of attack, just like the cases of other flat surfaces or bluff bodies. Once this aerodynamic phenomenon is set in motion, an aircraft will respond, and interaction between the aerodynamics and the wing attitude will lead to wing rock. However, it should be emphasized that this type of wing rock has not been studied so far. The basic difference with the well-known case is that for very large angles of attack, the flow is fully separated, even if the attitude of the aircraft is fixed. Since the submission of this research Note, the present team has continued work on this project. Most recently, it was found that at intermediate angles of attack, simultaneous vortex shedding is also possible. The reader will find more information in a recent conference paper.