Unsteady dynamics of turbulent flow in the wakes of barchan dunes modulated by overlying boundary-layer structure

• Published in: Journal of fluid mechanics Vol. 920
• Main Authors: Bristow, Nathaniel R., Blois, Gianluca, Best, James L., Christensen, Kenneth T.
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 10.08.2021
• Subjects: Amplitude modulation; Bed forms; Bedforms; Boundary layers; Computational fluid dynamics; Dunes; Dynamics; Flow structures; Fluid flow; Flumes; Identification; JFM Papers; Momentum; Morphology; Particle image velocimetry; Reynolds number; River beds; Roughness; Sediment transport; Sedimentary structures; Shear stress; Swirling; Three dimensional flow; Turbulent boundary layer; Turbulent flow; Vortices; Wakes; Wavelet analysis; turbulent boundary layers; topographic effects; boundary layer structure

The dynamics of turbulent flow structures in the wakes of barchan dunes is investigated to understand the complex, long-range interactions that occur between these three-dimensional bedforms. High-frame-rate stereo-particle image velocimetry measurements are collected from the cross-stream plane in...