Stability of wakes behind elongated bluff bodies at incidence

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Abstract

Flow past elongated bluff bodies for Reynolds numbers Re ≼ 500 is investigated here for incident angles I ≼ 20°. Two-dimensional simulations are performed using a spectral element solver for elliptical shaped cylinders for aspect ratios AR ≼ 2.5 to first obtain the base flows, following which linear stability analysis is performed on the unsteady base flows to investigate the onset of three-dimensional modes. For low aspect ratio cylinders, the transition sequence from steady two-dimensional flow to unsteady three-dimensional flow (steady → unsteady → mode A → mode B → mode QP) closely resembles that of a circular cylinder for all incident angles. As the aspect ratio is increased, the onset of the these transitions is delayed to higher Reynolds numbers for a given incidence angle, while the onset of the three-dimensional modes occurs at lower Reynolds numbers on increasing the incidence angles. The behaviour of the various three-dimensional modes is investigated in this parameter space.

Original languageEnglish
Title of host publicationProceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9781740523776
Publication statusPublished - 2016
EventAustralasian Fluid Mechanics Conference 2016 - The University of Western Australia, Perth, Australia
Duration: 5 Dec 20168 Dec 2016
Conference number: 20th

Publication series

NameProceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016

Conference

ConferenceAustralasian Fluid Mechanics Conference 2016
Abbreviated titleAFMC 2016
CountryAustralia
CityPerth
Period5/12/168/12/16

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