Coherent structures in a self-similar adverse pressure gradient turbulent boundary layer

A. Sekimoto, V. Kitsios, C. Atkinson, J. Jiménez, J. Soria

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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 languageEnglish
Title of host publicationProceedings of the 20th Australasian Fluid Mechanics Conference (AFMC)
PublisherAustralasian Fluid Mechanics Society
Number of pages4
ISBN (Electronic)9781740523776
Publication statusPublished - Dec 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


ConferenceAustralasian Fluid Mechanics Conference 2016
Abbreviated titleAFMC 2016

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