Moti Karpel ,Federico Roizner, Robert Carrese, Pier Marzocca

DOI Number: N/A

Conference number: IFASD-2017-106

The recently developed parametric flutter margin (PFM) method is combined with the increase-order modeling (IOM) approach to facilitate stability analysis of nonlinear aeroservoelastic systems with computational fluid dynamics (CFD)-based aerodynamics. The IOM-based Dynresp code is utilized to exchange data with the Fluent CFD code at various fidelity and coupling levels and some features are applied to flutter analysis of a twin-tail configuration under wing-generated buffet loads. Being based on dynamic response to external excitation while the aeroelastic equation of motion is augmented by a stabilizing parameter, the PFM method may significantly improve flutter analyses with nonlinear CFDbased aerodynamic models. However, aeroelastic CFD simulations might induce buffet loads that excite the structure adding noise to the PFM calculations. The main purpose of the work described in this paper was to investigate the effects of the buffet-induced noise on the accuracy of CFD-based PFM predictions. The PFM method is presented in this context and applied to a numerical model of a wind-tunnel of the F/A-18 aircraft. The Dynresp-Fluent assembly is applied to dynamic response cases with and without buffet loads and flutter results are compared with common linear analyses.

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In Categories: 1.Events, Computational Aeroelasticity, IFASD 2017
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