Spanwise Particle Clusters in DNS of Sediment Transport Over a Regular and an Irregular Bed

Spanwise Particle Clusters in DNS of Sediment Transport Over a Regular and an Irregular Bed The paper presents a comparison of two phase-resolving simulations of heavy particles in a turbulent open-channel flow to investigate the impact of the regularity of the underlying sediment bed on both the fluid and the particle phase. While a regular sediment bed is common practice for both experimental and numerical studies, it may introduce over-idealized conditions in the physical setup, which is investigated by juxtaposing these results with those obtained using a particularly designed irregular bed. It is found that the overall transport mode remains unchanged, but the configuration of the sediment bed has an impact on various statistical quantities that show quantitative differences for the two considered cases. The disturbed irregular bed enhances turbulent fluctuations and promotes formation of particle clusters as well as the resuspension of particles. It is shown that this change in the configuration yields more realistic results resembling bedforms such as subaqueous dunes that may be observed on the field-scale. The proposed type of irregularity constitutes a benchmark to investigate this issue in further experiments and simulations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png "Flow, Turbulence and Combustion" Springer Journals

Spanwise Particle Clusters in DNS of Sediment Transport Over a Regular and an Irregular Bed

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Publisher
Springer Netherlands
Copyright
Copyright © 2017 by Springer Science+Business Media B.V.
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer; Automotive Engineering
ISSN
1386-6184
eISSN
1573-1987
D.O.I.
10.1007/s10494-017-9850-x
Publisher site
See Article on Publisher Site

Abstract

The paper presents a comparison of two phase-resolving simulations of heavy particles in a turbulent open-channel flow to investigate the impact of the regularity of the underlying sediment bed on both the fluid and the particle phase. While a regular sediment bed is common practice for both experimental and numerical studies, it may introduce over-idealized conditions in the physical setup, which is investigated by juxtaposing these results with those obtained using a particularly designed irregular bed. It is found that the overall transport mode remains unchanged, but the configuration of the sediment bed has an impact on various statistical quantities that show quantitative differences for the two considered cases. The disturbed irregular bed enhances turbulent fluctuations and promotes formation of particle clusters as well as the resuspension of particles. It is shown that this change in the configuration yields more realistic results resembling bedforms such as subaqueous dunes that may be observed on the field-scale. The proposed type of irregularity constitutes a benchmark to investigate this issue in further experiments and simulations.

Journal

"Flow, Turbulence and Combustion"Springer Journals

Published: Sep 9, 2017

References

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