Schwarzmeier C, Rettinger C, Kemmler S, Plewinski J, Núñez-González F, Köstler H, Rüde U, Vowinckel B (2023)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2023
Book Volume: 961
Pages Range: R1
DOI: 10.1017/jfm.2023.262
Open Access Link: https://doi.org/10.1017/jfm.2023.262
The interaction of supercritical turbulent flows with granular sediment
beds is challenging to study both experimentally and numerically. This
challenging task has hampered advances in understanding antidunes, the
most characteristic bedform of supercritical flows. This article
presents the first numerical attempt to simulate upstream-migrating
antidunes with geometrically resolved particles and a liquid–gas
interface. Our simulations provide data at a resolution higher than
laboratory experiments, and they can therefore provide new insights into
the mechanisms of antidune migration and contribute to a deeper
understanding of the underlying physics. To manage the simulations’
computational costs and physical complexity, we employ the cumulant
lattice Boltzmann method in conjunction with a discrete element method
for particle interactions, as well as a volume-of-fluid scheme to track
the deformable free surface of the fluid. By reproducing two flow
configurations of previous experiments (Pascal et al., Earth Surf. Process. Landf.,
vol. 46, issue 9, 2021, pp. 1750–1765), we demonstrate that our
approach is robust and accurately predicts the antidunes’ amplitude,
wavelength and celerity. Furthermore, the simulated wall shear stress, a
key parameter governing sediment transport, is in excellent agreement
with the experimental measurements. The highly resolved data of fluid
and particle motion from our simulation approach open new perspectives
for detailed studies of morphodynamics in shallow supercritical flows.
APA:
Schwarzmeier, C., Rettinger, C., Kemmler, S., Plewinski, J., Núñez-González, F., Köstler, H.,... Vowinckel, B. (2023). Particle-resolved simulation of antidunes in free-surface flows. Journal of Fluid Mechanics, 961, R1. https://doi.org/10.1017/jfm.2023.262
MLA:
Schwarzmeier, Christoph, et al. "Particle-resolved simulation of antidunes in free-surface flows." Journal of Fluid Mechanics 961 (2023): R1.
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