Benchmarking the prediction of dynamic derivatives : Wind tunnel tests, validation, acceleration methods

• The dynamic derivatives are widely used in linear aerodynamic models which are considered to determine the flying qualities of an aircraft: The ability to predict them reliably, quickly and sufficiently early in the design process is more and more important. This paper describes some experimental and computational activities dealing with the determination of dynamic derivatives. The work has been carried out within the FP6 European project SimSAC. Numerical and experimental results are compared for two aircraft configurations: The generic civil transport aircraft, wing-fuselage-tail configuration DLR-F12 and a generic Transonic CRuiser (TCR), which is a canard configuration. Static and dynamic wind tunnel tests have been carried out for both configurations and are briefly described. The data base generated for the TCR configuration includes small amplitude oscillations, dedicated to the determination of dynamic derivatives, and large amplitude oscillations, in order to investigate the dynamic effects on nonlinear aerodynamic characteristics. The influence of the canard has been investigated. Dynamic derivatives have been determined on both configurations with a large panel of tools, from linear aerodynamic (Vortex Lattice Methods) to CFD (unsteady Reynolds-Averaged Navier-Stokes solvers). Strong limitations of linear aerodynamic tools are observed for the canard configuration. A specific attention is paid to acceleration techniques in CFD methods, which allow the computational time to be dramatically reduced while keeping a satisfactory accuracy.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Farkostteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Vehicle Engineering (hsv//eng)

Keyword

Aircraft configurations

Dynamic wind tunnel tests

Large amplitude oscillation

Linear aerodynamic model

Non-linear aerodynamics

Small-amplitude oscillations

Unsteady reynolds-averaged navier-stokes

Wing-fuselage-tail configuration

Aircraft models

Computational fluid dynamics

Dynamics

Flight dynamics

Fuselages

Tools

Transport aircraft

Wind stress

Aerodynamic configurations

Publication and Content Type

ref (subject category)

kon (subject category)