LIMIT-CYCLE PHENOMENA IN COMPUTATIONAL TRANSONIC AEROELASTICITY

Limit cycle behavior has been observed in past transonic nutter calcul ations by the authors, using a two degree-of-freedom typical section m odel coupled to an unsteady Euler equations solver. In this article, t he structural nonlinearity of freeplay has been added to the typical s ection model, and its effects on the dynamic stability problem are ass essed. In addition, limit cycle behavior in the swept-wing model of Is ogai is demonstrated and related to the observed presence of multiple flutter points in the transonic dip region.