Evaluation of Dynamic Derivatives Using Computational Fluid Dynamics

• Published in: AIAA journal 2012-02, Vol.50 (2), p.470-484
• Main Authors: Ronch, A. Da, Vallespin, D, Ghoreyshi, M, Badcock, K. J
• Format: Article
• Language: English
• Subjects: Air transportation and traffic; Applied sciences; Computational fluid dynamics; Computational methods in fluid dynamics; Derivatives; Dynamic tests; Dynamical systems; Dynamics; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Ground, air and sea transportation, marine construction; Mathematical models; Navier-Stokes equations; Physics
• ISSN: 0001-1452; 1533-385X
• DOI: 10.2514/1.J051304

This paper focuses on the evaluation of the dynamic stability derivative formulation. The derivatives are calculated using the Euler and Reynolds-averaged Navier-Stokes equations, and a time-domain solver was used for the computation of aerodynamic loads for forced periodic motions. To validate the predictions, two test cases are used. For the standard dynamic model geometry, a database of dynamic simulations illustrates the effects of the systematic variation of motion and fluid parameters involved. A satisfactory agreement was observed with available experimental data, and the dependency of dynamic derivatives on a number of parameters, such as Mach number, mean angle of attack, frequency, and amplitude, was assessed. For the transonic cruiser wind-tunnel geometry, static and unsteady aerodynamic characteristics were validated against experimental measurements. The ability of models based on the dynamic derivatives to predict large-amplitude motion forces and moments was assessed. It was demonstrated that the dynamic derivative model does not represent all of the important effects due to aerodynamics.