Turbulent bursting and higher-order moments in the wake flow behind two horizontal cylinders

Article Type

Research Article

Publication Title

Acta Geophysica

Abstract

Turbulent bursting in near- and far-wake flow zones past two horizontal cylinders was studied in the present article. The bursting events and associated time and frequency were first computed from the experimental data and then higher-order moments were evaluated to validate the experimental findings. From the stress ratio of Reynolds Shear Stress (RSS) plots, sweep was found to be the main contributing event that attains the maximum value up to 600% to the development of RSS in the near-wake flow zone in the vicinity of the bed, causing a rush of accelerating fluid streaks. The average duration and interval of the bursting events indicate that in the near-wake flow zone, the bursting events are fundamentally shorter than their interval of occurrence. Furthermore, third-order moments have been evaluated and utilized to validate the bursting events by comparing with the residual shear stress. The present study should enrich the knowledge of the bursting events in bluff-body hydrodynamics by adding new experimental findings in open-channel turbulence.

First Page

4583

Last Page

4604

DOI

10.1007/s11600-025-01618-1

Publication Date

10-1-2025

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