What is it about?
Water flow involves a variety of turbulent eddies, ranging from very small scales up to the depth of the water, the width of the channel, and even larger. Recently, researchers have shown the presence of turbulent structures called very-large-scale motions (VLSMs), which can extend up to 50 times the water depth. Based on experimental data, we discuss the generation process of VLSMs, energy transfers, and how VLSMs contribute to hydraulic resistance.
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Why is it important?
Our work presents a new method for investigating VLSMs using structure functions. Additionally, it introduces, for the first time, a potential mechanism by which VLSMs contribute to mixing momentum and, consequently, hydraulic resistance.
Perspectives
I enjoyed collaborating on this article with knowledgeable and enthusiastic co-authors, and I am proud to have contributed to the fascinating topic of turbulence in water flows.
Andrea Zampiron
Universita degli Studi di Padova
Read the Original
This page is a summary of: Very-large-scale motions in open-channel flow: Insights from velocity spectra, correlations, and structure functions, Physics of Fluids, April 2024, American Institute of Physics,
DOI: 10.1063/5.0205033.
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