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

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dc.contributor.authorRanga Dinesh, K. K. J.
dc.contributor.authorKirkpatrick, M. P.
dc.date.accessioned2009-04-29T10:51:26Z
dc.date.available2009-04-29T10:51:26Z
dc.date.issued2009-06
dc.description.abstractLarge eddy simulations (LES) are used to investigate turbulent isothermal swirling flows with a strong emphasis on vortex breakdown, recirculation and instability behaviour. 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 sub-grid 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 center 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.en_UK
dc.identifier.citationK.K.J. Ranga Dinesh, M.P. Kirkpatrick, Study of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES, Computers & Fluids, Volume 38, Issue 6, June 2009, Pages 1232-1242en_UK
dc.identifier.issn0045-7930
dc.identifier.urihttp://dx.doi.org/10.1016/j.compfluid.2008.11.015
dc.identifier.urihttp://hdl.handle.net/1826/3361
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.titleStudy of jet precession, recirculation and vortex breakdown in turbulent swirling jets using LES.en_UK
dc.typePostprinten_UK

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