GUST RESPONSE OF A TYPICAL SECTION VIA CFD AND ANALYTICAL SOLUTIONS

The gust response of a Typical Section is investigated in term of both highfidelity Computational Fluid Dynamics (CFD) and low-fidelity analytical solutions of the aerodynamic flow around it, in order to assess the suitability of the two approaches in the preliminary design of a flexible wing. The aerodynamic forces acting over the oscillating airfoil are calculated using the high-fidelity commercial tool FLOW-3D and in term of the low-fidelity Theodorsen and Wagner theories formulated in a state-space form. A sinusoidal vertical gust acts as the aerodynamic perturbation to the static equilibrium of the aeroelastic system, the static and dynamic responses of which are provided for different airfoil shapes, Typical Section elastic properties, gust intensities and approaches. The effects of the physical differences between the two models are identified in the case of both attached and separated flow during the airfoil’s aeroelastic response. For attached flow the low-fidelity gust response agrees well with the high-fidelity one, whereas for separated flow the low-fidelity model is unable to predict the strong oscillations of the Typical Section in dynamic stall conditions and suitable tuning of its response is needed. Berci M., Mascetti S., Incognito A., Gaskell P.H., Toropov V.V. 2

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