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 L35: Geophysical Fluid Dynamics: General
4:05 PM–6:41 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B407
Chair: Alfredo Pinelli, City University London
Abstract ID: BAPS.2018.DFD.L35.5
Abstract: L35.00005 : Time-resolved and statistical PIV measurements in a refractive index matched flume to elucidate the turbulent flow structure over 3D bedforms*
4:57 PM–5:10 PM
Presenter:
Nathaniel Bristow
(University of Notre Dame)
Authors:
Nathaniel Bristow
(University of Notre Dame)
Gianluca Blois
(University of Notre Dame)
Jim Best
(University of Illinois at Urbana-Champaign)
Kenneth Thor Christensen
(University of Notre Dame)
Barchan dunes are three-dimensional, crescent-shaped bedforms, and while most commonly associated with aeolian environments, recent observations have shown them to form in subaqueous and extraterrestrial environments as well. As barchans migrate in the direction of the flow, they interact with their neighbors, typically by way of a collision. The morphodynamics of such collision processes are complex, where the role of the turbulent flow structure is strongly coupled to that of the sediment transport and morphological change. Here we study the flow structure in a decoupled manner through measurements of the turbulent flow over fixed-bed models of barchan dunes in various configurations involved in a barchan collision process. Particle image velocimetry is used to measure the flow in a refractive-index matched flume environment that enables uninhibited access to the whole flow field around these geometrically complex bedforms. Presented herein are results from temporally resolved stereo PIV measurements showing the dynamics of turbulent flow structure in the cross-plane, as well as turbulent statistics from low frame-rate 2D PIV measurements in streamwise–wall-parallel planes.
*This work was supported by the National Science Foundation through grant CBET-1603211.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.L35.5
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