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Large-Eddy Simulations and modal reconstruction of laminar transonic buffet

Large-Eddy Simulations and modal reconstruction of laminar transonic buffet
Large-Eddy Simulations and modal reconstruction of laminar transonic buffet
Transonic buffet refers to the self-sustained periodic motion of shock waves observed in transonic flows over wings and can limit the flight envelope of aircraft. Based on the boundary layer characteristics at the shock foot, buffet has been classified as laminar or turbulent and the mechanisms underlying the two have been proposed to be different (Dandois et al., 2018, J. Fluid Mech., vol. 18, pp. 156–178). The effect of various flow parameters (freestream Mach and Reynolds numbers and sweep and incidence angles) on laminar transonic buffet on an infinite wing (Dassault Aviation’s supercritical V2C aerofoil) is reported here by performing Large-Eddy Simulations (LES) for a wide range of parameters. A spectral proper orthogonal decomposition identified the presence of a low-frequency mode associated with buffet and high-frequency wake modes related to vortex shedding. A flow reconstruction based only on the former shows periodic boundary-layer separation and reattachment accompanying shock wave motion. A modal reconstruction based only on the wake mode suggests that the separation bubble breathing phenomenon reported by Dandois et al. is due to this mode. Together, these results indicate that the physical mechanisms governing laminar and turbulent buffet are the same. Buffet was also simulated at zero incidence. Shock waves appear on both aerofoil surfaces and oscillate out of phase with each other indicating the occurrence of a Type I buffet (Giannelis et al., 2018, Aerosp. Sci. Technol., vol. 18, pp. 89–101) on a supercritical aerofoil. These results suggest that the mechanisms underlying different buffet types are the same.
0022-1120
Moise, Pradeep
477a368b-c418-46b3-a94a-4b53049b93ba
Zauner, Markus
297472d4-56c0-458a-a510-ae43ecd5bd51
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97
Moise, Pradeep
477a368b-c418-46b3-a94a-4b53049b93ba
Zauner, Markus
297472d4-56c0-458a-a510-ae43ecd5bd51
Sandham, Neil
0024d8cd-c788-4811-a470-57934fbdcf97

Moise, Pradeep, Zauner, Markus and Sandham, Neil (2022) Large-Eddy Simulations and modal reconstruction of laminar transonic buffet. Journal of Fluid Mechanics. (In Press)

Record type: Article

Abstract

Transonic buffet refers to the self-sustained periodic motion of shock waves observed in transonic flows over wings and can limit the flight envelope of aircraft. Based on the boundary layer characteristics at the shock foot, buffet has been classified as laminar or turbulent and the mechanisms underlying the two have been proposed to be different (Dandois et al., 2018, J. Fluid Mech., vol. 18, pp. 156–178). The effect of various flow parameters (freestream Mach and Reynolds numbers and sweep and incidence angles) on laminar transonic buffet on an infinite wing (Dassault Aviation’s supercritical V2C aerofoil) is reported here by performing Large-Eddy Simulations (LES) for a wide range of parameters. A spectral proper orthogonal decomposition identified the presence of a low-frequency mode associated with buffet and high-frequency wake modes related to vortex shedding. A flow reconstruction based only on the former shows periodic boundary-layer separation and reattachment accompanying shock wave motion. A modal reconstruction based only on the wake mode suggests that the separation bubble breathing phenomenon reported by Dandois et al. is due to this mode. Together, these results indicate that the physical mechanisms governing laminar and turbulent buffet are the same. Buffet was also simulated at zero incidence. Shock waves appear on both aerofoil surfaces and oscillate out of phase with each other indicating the occurrence of a Type I buffet (Giannelis et al., 2018, Aerosp. Sci. Technol., vol. 18, pp. 89–101) on a supercritical aerofoil. These results suggest that the mechanisms underlying different buffet types are the same.

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Large-Eddy Simulations and modal reconstruction of laminar transonic buffet - Accepted Manuscript
Restricted to Repository staff only until 23 November 2022.
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Accepted/In Press date: 23 May 2022

Identifiers

Local EPrints ID: 457739
URI: http://eprints.soton.ac.uk/id/eprint/457739
ISSN: 0022-1120
PURE UUID: 6067980d-58f5-4c0e-b9cd-ff76cf2c0802
ORCID for Pradeep Moise: ORCID iD orcid.org/0000-0001-8007-4453
ORCID for Markus Zauner: ORCID iD orcid.org/0000-0002-6644-2990
ORCID for Neil Sandham: ORCID iD orcid.org/0000-0002-5107-0944

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Date deposited: 16 Jun 2022 00:28
Last modified: 06 Jul 2022 02:09

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Contributors

Author: Pradeep Moise ORCID iD
Author: Markus Zauner ORCID iD
Author: Neil Sandham ORCID iD

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