## 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 language | English |
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Title of host publication | Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016 |

Publisher | Australasian Fluid Mechanics Society |

ISBN (Electronic) | 9781740523776 |

Publication status | Published - 2016 |

Event | Australasian Fluid Mechanics Conference 2016 - The University of Western Australia, Perth, Australia Duration: 5 Dec 2016 → 8 Dec 2016 Conference number: 20th |

### Publication series

Name | Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016 |
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### Conference

Conference | Australasian Fluid Mechanics Conference 2016 |
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Abbreviated title | AFMC 2016 |

Country/Territory | Australia |

City | Perth |

Period | 5/12/16 → 8/12/16 |