Computational Study of the Stability Derivatives for the Standard Dynamic Model

초록

This paper describes a computational study of the prediction of stability derivatives for the standard dynamic model(SDM) using three-dimensional Euler and Reynolds-averaged Navier-Stokes(RANS) computation fluid dynamics(CFD) solvers. Directional and longitudinal stability derivatives are computed in pitch and yaw harmonic oscillations, and a dual time stepping method is applied to evaluate time-accurate solutions. Lateral derivatives are evaluated by a steady state method in a non-inertial reference frame. Source terms due to the transformation of the governing equations to the non-inertial coordinate are added for the steady state method. Simulations are performed at various flight conditions in terms of Mach numbers, angles of attack, and oscillation amplitudes. The simulations show that the nonlinear characteristics of the stability derivatives appear at high angles of attack as well as in the transonic region.