Numerical investigation of the characteristics of double degree-of-freedom motion of an 80° delta wing in force-pitch and free-roll

Numerical investigation of the characteristics of double Degree-Of-Freedom（DOF） motion of an 80° delta wing in force-pitch and free-roll is presented,in which a coupling numerical method is employed for solving Navier-Stokes equations and rigid-body dynamic equations.The investigation includes: compare of the characteristics between double DOF motion and single DOF motion,the amplitude and frequency characteristics of the free-roll motion in dynamic incidence and the characteristics of aerodynamics in coupled double DOF motion.It is shown that no limit-cycle-oscillation can be formed with dynamic incidence,the variation of the amplitude of free-roll lags behind the variation of incidence,noticeable inclination of lift and worse transverse stability are achieved in double DOF motion.