Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session R02: Turbulence: Shear Layers
1:50 PM–3:34 PM,
Monday, November 20, 2023
Room: Ballroom B
Chair: Katepalli Sreenivasan, New York University
Abstract: R02.00005 : Revisiting Taylor's Hypothesis in Homogeneous Turbulent Shear Flow
2:42 PM–2:55 PM
Presenter:
Frank G Jacobitz
(University of San Diego)
Authors:
Frank G Jacobitz
(University of San Diego)
Kai Schneider
(Aix-Marseille University)
crucial importance for experimental studies and theoretical investigations. Results from direct numerical simulations are used here to study the
applicability of Taylor’s Hypothesis in homogeneous turbulent shear flow by considering the correlation of the Eulerian acceleration with the convective
acceleration (i.e., the nonlinear term). Using a wavelet-based scale decomposition of the accelerations, their correlations at different scales of motion
are investigated. This approach allows us to revisit Taylor's Hypothesis by examining the cancellation properties of Eulerian and convective accelerations
at different flow scales. The results show that Taylor's hypothesis holds at small scales of the flow as reflected by the anti-alignment of the Eulerian
acceleration and the convective term. Such anti-alignment, however, is not observed at the largest scales of the turbulent motion, indicating that
Taylor's hypothesis does not generally hold for homogeneous turbulent shear flow.
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