Evaluation of dynamic derivatives using computational fluid dynamics

Da Ronch, A., Vallespin, D., Ghoreyshi, M. and Badcock, K. J. (2012) Evaluation of dynamic derivatives using computational fluid dynamics. AIAA Journal, 50 (2), 470-484. (doi:10.2514/1.J051304).

Abstract

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.

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Contributors

Author: A. Da Ronch

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