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DNS of acoustic receptivity and breakdown in a mach 6 flow over a generic forebody

DNS of acoustic receptivity and breakdown in a mach 6 flow over a generic forebody
DNS of acoustic receptivity and breakdown in a mach 6 flow over a generic forebody

Direct numerical simulations (DNS) of the Navier-Stokes equations have been performed to investigate the receptivity and breakdown mechanisms in a Mach 6 flow over a generic forebody geometry with freestream acoustic disturbances. The simulations are based on transition experiments carried out in April 2015 in the Boeing/AFOSR Mach 6 quiet tunnel facility at Purdue university (BAM6QT). A three-dimensional model for both fast and slow freestream acoustic waves with multiple frequencies and spanwise wavenumbers has been adopted in the numerical simulations, for which high-amplitude disturbances have been considered in order to simulate noisy wind tunnel conditions. The numerical results reveal similarities in comparison to the experimental observations, especially when slow acoustic waves are considered as freestream disturbances. In particular, slow acoustic waves have been found to induce the breakdown process via crossflow instabilities located in the off-centerline region, with formation of streamwise streaks. Fast acoustic waves, in contrast, appear more efficient in inducing earlier nonlinear growth through destabilization of the boundary layer along the symmetry plane of the body.

American Institute of Aeronautics and Astronautics
Cerminara, Adriano
6fd11181-c852-4558-82b5-5f7eac291a3f
Durant, Antoine
91a3863d-e525-4bd5-94ec-10a76aa0a55b
André, Thierry
a776e501-b185-4e46-9987-218ace7af88d
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Taylor, Nigel J.
8b8d0ad4-c89a-4bf9-add4-5e71b9a0458b
Cerminara, Adriano
6fd11181-c852-4558-82b5-5f7eac291a3f
Durant, Antoine
91a3863d-e525-4bd5-94ec-10a76aa0a55b
André, Thierry
a776e501-b185-4e46-9987-218ace7af88d
Sandham, Neil D.
0024d8cd-c788-4811-a470-57934fbdcf97
Taylor, Nigel J.
8b8d0ad4-c89a-4bf9-add4-5e71b9a0458b

Cerminara, Adriano, Durant, Antoine, André, Thierry, Sandham, Neil D. and Taylor, Nigel J. (2018) DNS of acoustic receptivity and breakdown in a mach 6 flow over a generic forebody. In AIAA Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2018-0348).

Record type: Conference or Workshop Item (Paper)

Abstract

Direct numerical simulations (DNS) of the Navier-Stokes equations have been performed to investigate the receptivity and breakdown mechanisms in a Mach 6 flow over a generic forebody geometry with freestream acoustic disturbances. The simulations are based on transition experiments carried out in April 2015 in the Boeing/AFOSR Mach 6 quiet tunnel facility at Purdue university (BAM6QT). A three-dimensional model for both fast and slow freestream acoustic waves with multiple frequencies and spanwise wavenumbers has been adopted in the numerical simulations, for which high-amplitude disturbances have been considered in order to simulate noisy wind tunnel conditions. The numerical results reveal similarities in comparison to the experimental observations, especially when slow acoustic waves are considered as freestream disturbances. In particular, slow acoustic waves have been found to induce the breakdown process via crossflow instabilities located in the off-centerline region, with formation of streamwise streaks. Fast acoustic waves, in contrast, appear more efficient in inducing earlier nonlinear growth through destabilization of the boundary layer along the symmetry plane of the body.

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More information

e-pub ahead of print date: 7 January 2018
Published date: 8 January 2018
Venue - Dates: AIAA Aerospace Sciences Meeting, 2018, Kissimmee, United States, 2018-01-08 - 2018-01-12

Identifiers

Local EPrints ID: 419496
URI: https://eprints.soton.ac.uk/id/eprint/419496
PURE UUID: a90c5ebf-b4b3-479a-913e-9a54821b705e
ORCID for Neil D. Sandham: ORCID iD orcid.org/0000-0002-5107-0944

Catalogue record

Date deposited: 13 Apr 2018 16:30
Last modified: 14 Mar 2019 01:49

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