TY - GEN

T1 - Coherent structures in a self-similar adverse pressure gradient turbulent boundary layer

AU - Sekimoto, A.

AU - Kitsios, V.

AU - Atkinson, C.

AU - Jiménez, J.

AU - Soria, J.

N1 - Funding Information:
The support of the ARC, NCI and Pawsey SCC funded by the Australian and Western Australian governments as well as the support of PRACE funded by the European Union are gratefully acknowledged.
Publisher Copyright:
© 2006 Australasian Fluid Mechanics Society. All rights reserved.

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

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M3 - Conference contribution

AN - SCOPUS:85084013002

T3 - Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016

BT - Proceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2006

PB - Australasian Fluid Mechanics Society

T2 - 20th Australasian Fluid Mechanics Conference, AFMC 2006

Y2 - 5 December 2016 through 8 December 2016

ER -