## Abstract

The turbulence statistics and structures of a self-similar adverse pressure gradient turbulent boundary layer (APG-TBL) at the verge of separation are investigated using a direct numerical simulation (DNS). The desired self-similar APG-TBL is achieved by a modification of the far-field velocity boundary condition. The required wall-normal velocity in the far-field to produce the necessary adverse pressure gradient was estimated based on the analytical free-stream streamwise velocity distribution for a flow at the point of separation, and the assumption that the streamlines of the outer flow follow the growth of the boundary layer thickness. The APG-TBL develops over a momentum thickness based Reynolds number upto 12000, and achieves a self-similar region of constant friction coefficient, pressure velocity and shape factor. Turbulence statistics in this region show self-similar collapse when scaled by the external velocity and the displacement thickness. In this study, the coherent structures of a self-similar APG-TBL are investigated by using topological methodology and visualisation techniques.

Original language | English |
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Title of host publication | Proceedings of the 20th Australasian Fluid Mechanics Conference (AFMC) |

Publisher | Australasian Fluid Mechanics Society |

Number of pages | 4 |

ISBN (Electronic) | 9781740523776 |

Publication status | Published - Dec 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 |