Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session D29: Turbulent Boundary Layers II
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B401
Chair: Dennice Gayme, Johns Hopkins University
Abstract ID: BAPS.2018.DFD.D29.2
Abstract: D29.00002 : Multiscale analysis of non-equilibrium boundary layers at moderate Reynolds numbers*
2:43 PM–2:56 PM
Presenter:
Adrian Lozano-Duran
(Stanford University)
Authors:
Adrian Lozano-Duran
(Stanford University)
Marco Giometto
(Columbia University)
George Ilhwan Park
(University of Pennsylvania)
Parviz Moin
(Stanford University)
dimensional turbulent boundary layers at friction Reynolds numbers up to 1000 using direct numerical simulation of planar channels subjected to a sudden spanwise pressure gradient. It is shown that the scaling properties and regimes of the flow across different Reynolds numbers can be explained in terms of a hierarchy of self-similar wall-attached eddies with characteristic time-scales proportional to their distance the wall. These momentum-carrying eddies are shown to undergo Reynolds stress depletion caused by the formation of a spanwise boundary layer which inhibits the redistribution of energy via pressure-strain correlation. Our findings answer fundamental questions regarding the structural changes of equilibrium wall-turbulence under the imposition of additional strain.
*Funded by ONR under Grant #N00014-16-S-BA10.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D29.2
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