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Study of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES

Study of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES
Study of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES
Large eddy simulations (LES) are used to investigate turbulent isothermal swirling flows with a strong emphasis on vortex breakdown, recirculation and instability behavior. The Sydney swirl burner configuration is used for all simulated test cases from low to high swirl and Reynolds numbers. The governing equations for continuity and momentum are solved on a structured Cartesian grid, and a Smagorinsky eddy viscosity model with the localised dynamic procedure is used as the subgrid scale turbulence model. The LES successfully predicts both the upstream first recirculation zone generated by the bluff body and the downstream vortex breakdown bubble. The frequency spectrum indicates the presence of low frequency oscillations and the existence of a central jet precession as observed in experiments. The LES calculations well captured the distinct precession frequencies. The results also highlight the precession mode of instability in the centre jet and the oscillations of the central jet precession, which forms a precessing vortex core. The study further highlights the predictive capabilities of LES on unsteady oscillations of turbulent swirling flow fields and provides a good framework for complex instability investigations.
0045-7930
1232-1242
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Kirkpatrick, M.P.
cf76adda-898f-472d-a93a-c55d29b06fba
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Kirkpatrick, M.P.
cf76adda-898f-472d-a93a-c55d29b06fba

Ranga Dinesh, K.K.J. and Kirkpatrick, M.P. (2009) Study of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES. Computers & Fluids, 38 (6), 1232-1242. (doi:10.1016/j.compfluid.2008.11.015).

Record type: Article

Abstract

Large eddy simulations (LES) are used to investigate turbulent isothermal swirling flows with a strong emphasis on vortex breakdown, recirculation and instability behavior. The Sydney swirl burner configuration is used for all simulated test cases from low to high swirl and Reynolds numbers. The governing equations for continuity and momentum are solved on a structured Cartesian grid, and a Smagorinsky eddy viscosity model with the localised dynamic procedure is used as the subgrid scale turbulence model. The LES successfully predicts both the upstream first recirculation zone generated by the bluff body and the downstream vortex breakdown bubble. The frequency spectrum indicates the presence of low frequency oscillations and the existence of a central jet precession as observed in experiments. The LES calculations well captured the distinct precession frequencies. The results also highlight the precession mode of instability in the centre jet and the oscillations of the central jet precession, which forms a precessing vortex core. The study further highlights the predictive capabilities of LES on unsteady oscillations of turbulent swirling flow fields and provides a good framework for complex instability investigations.

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Published date: June 2009
Organisations: Engineering Science Unit

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Local EPrints ID: 347345
URI: http://eprints.soton.ac.uk/id/eprint/347345
ISSN: 0045-7930
PURE UUID: 5b4daff7-a235-4784-944c-99bf99156c6f
ORCID for K.K.J. Ranga Dinesh: ORCID iD orcid.org/0000-0001-9176-6834

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Date deposited: 25 Jan 2013 16:47
Last modified: 15 Mar 2024 03:46

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Author: M.P. Kirkpatrick

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