Study of Three-Dimensional Transonic Buffet on Swept Wings

Plante, Frédéric; Dandois, Julien; Sartor, Fulvio; Laurendeau, Éric

doi:10.2514/6.2017-3903

Cited by 11 publications

(10 citation statements)

References 25 publications

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“…This is why all the previous spectra regarding the 3D mode have been mostly focused on the β = 2π case. This dominant wavenumber value for the three-dimensional buffet mode is consistent with the results of Dandois [12] (β = 2.6π ), Iovnovich and Raveh [14] (β = 2.6π ), and Plante et al [15] (β = 2.9π ). The variation of the frequency in the swept wing case is shown to be linear with the wavenumber, while it is zero for the unswept case [see Fig.…”

Section: Effect Of Wavenumber For 0 • 30 • At α = 35 •supporting

confidence: 91%

“…6(b). It is very similar to the unsteady structures of the flow found numerically by Iovnovich and Raveh [14] and Plante et al [15] and experimentally by Dandois [12] and Sugioka et al [18] for the 3D buffet. The evolution of the spectrum with the sweep angle suggests that the phenomenon known as 3D transonic buffet is not linked with the 2D one: There are two distinct unstable modes in the spectrum.…”

Section: Sweep Effect For α = 35 • β = 0 and β = 2πsupporting

confidence: 88%

“…This 3D LW mode corresponds to the buffet cell phenomenon observed by Iovnovich and Raveh [14]. The wavenumber (β ≈ 2π or a wavelength equal to one chord length) and the convection velocity (0.43U n∞ or 0.37U ∞ ) of this 3D mode are in very good agreement with what has been observed experimentally [12,18] and numerically [15].…”

Section: -15supporting

confidence: 87%

“…These structures, called buffet cells, have been observed experimentally by Dandois [12] and Sugioka et al [18]. Plante et al [15] performed URANS simulations of the 3D transonic buffet for different sweep angles. In the unswept case, they observed an unstable steady phenomenon, which becomes unsteady when adding a sweep angle.…”

Section: Introductionmentioning

confidence: 78%

“…They outlined the convective nature of the 3D mode. The 3D transonic buffet has been successfully simulated by both unsteady Reynolds-averaged Navier-Stokes (URANS) simulations [14,15] and detached-eddy simulation (DES) [16,17]. Iovnovich and Raveh [14] showed numerically the presence of 3D patterns convected outboard on a swept wing.…”

Section: Introductionmentioning

confidence: 99%

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Transonic buffet instability: From two-dimensional airfoils to three-dimensional swept wings

et al. 2019

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Section: Effect Of Wavenumber For 0 • 30 • At α = 35 •supporting

confidence: 91%

Section: Sweep Effect For α = 35 • β = 0 and β = 2πsupporting

confidence: 88%

Section: -15supporting

confidence: 87%

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Transonic buffet instability: From two-dimensional airfoils to three-dimensional swept wings

et al. 2019

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Simulation of transonic buffet with an automated zonal DES approach

et al. 2020

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A study of transonic buffet on the NASA Common Research Model at flight Reynolds numbers is presented. The ability of two different hybrid RANS/LES models as well as the URANS approach for resolving three-dimensional buffet motion was evaluated by means of spectral analysis. Automated Zonal DES and URANS simulations show similar results in terms of buffet frequency and spanwise propagation of buffet cells, whereas the Delayed Detached Eddy Simulation results indicate a strong interaction between flow separation and shock motion. The extracted characteristic frequencies which are associated with transonic buffet are located in a range of Sr = 0.2–0.65 for URANS and AZDES and are therefore in accordance with findings from related recent research. Furthermore, the simulation time series were investigated and a structure of spanwise moving buffet cells with varying convection speed and wavelength could be observed.

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Global instability in the onset of transonic-wing buffet

2019

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Global stability analysis is used to analyse the onset of transonic buffet on infinite swept and unswept wings. This high-Reynolds-number flow is governed by the unsteady Reynolds averaged Navier–Stokes equations. The analysis generalizes earlier studies focused on two-dimensional airfoils. For the unswept wing, results show spanwise-periodic stationary modes in addition to the earlier-observed oscillatory mode. The oscillatory mode is nominally two-dimensional with a spanwise wavelength greater than ten wing chords. The stationary modes of instability exist over two bands of spanwise wavelengths centred around an intermediate wavelength of one wing chord, and around a short wavelength of one tenth of a wing chord. The intermediate-wavelength modes have a flow structure characteristic of airfoil buffeting modes, concentrated at the shock and in the shear layer downstream of the shock. The short-wavelength modes are only concentrated in the shear layer downstream of the shock. These stationary modes can lead to spanwise-periodic flow structures for the unswept wing. For the swept wing, these stationary modes become unsteady travelling modes and contribute to the more complex buffeting-flow structures observed on swept wings as compared with unswept wings. The spanwise-wavelength bands of the travelling modes translate to different frequencies, resulting in a broad-banded unsteady response for the swept wing. For a $30^{\circ }$ swept wing, the frequencies associated with the intermediate-wavelength modes are approximately 10 times higher than the swept-wing generalization of the long-wavelength oscillatory mode, and approximately 6 times higher than the long-wavelength mode for the unswept wing. These instability characteristics are in good agreement with experimental observations.

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Study of Three-Dimensional Transonic Buffet on Swept Wings

Cited by 11 publications

References 25 publications

Transonic buffet instability: From two-dimensional airfoils to three-dimensional swept wings

Transonic buffet instability: From two-dimensional airfoils to three-dimensional swept wings

Simulation of transonic buffet with an automated zonal DES approach

Global instability in the onset of transonic-wing buffet

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