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Session: Gust 2
Session starts: Wednesday 19 June, 11:00
Presentation starts: 12:00
Room: Room 1.4/1.5

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Nicholas Giannelis (University of New South Wales, Canberra)

Abstract:
While significant recent research efforts in transonic buffet have been dedicated to understanding the nature of the aeroelastic response of wing sections experiencing autonomous shock oscillations, a limited understanding of the sensitivity of this phenomenon to gust fields exists. Tartinville et al. [1] have considered the effect of discrete gust excitation on the transonic flow of a rigid OAT15A profile computationally, finding a correlation between shock displacement and gust length. Giannelis et al. [2] found that discrete gust perturbations have the potential to incite shock buffet for an aeroelastic profile at pre-buffet conditions. Similarly, Gao et al. [3] showed the potential for a reduction in shock buffet onset incidence when moving from a rigid to aeroelastic system. The goal of this present work is to systematically study the sensitivity of shock buffet onset to gust excitation for a two degree-of-freedom aeroelastic system, with both rigid and elastic computations are validated against available experimental data. This study will employ unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations using the commercial finite volume code ANSYS Fluent to represent the transonic flow unsteadiness of the OAT15A profile. These rigid buffet computations have been extensively validated in prior work by the authors [4]. For the aeroelastic computations, two-degree-of-freedom coupled pitch-heave dynamics are incorporated via Fluent’s 6-DoF Rigid Body Solver. The gust excitation is modelled through a source term in the y-momentum equations, in a manner similar to Golubev et. al. [5], and excellent agreement in the dynamic response is found with the experiments of Huvelin et al. [6]. The final manuscript will offer a parametric study on the sensitivity of the dynamic response of the system to various gust loads. The paper will map the sensitivity of buffet onset and the dynamic response to gust excitation. From the pre-buffet validation condition, sinusoidal, stochastic and discrete gust perturbations will be implemented (of varying intensities, lengths and frequency content). For a single case of each type of gust, the freestream conditions (angle of attack) and structural composition (mass and damping ratios) of the system will also be varied. Combining these results, this study will obtain a comprehensive understanding of the sensitivity of this complex system to its constituent parameters.