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Article

Numerical Study of Mixing Process by Point Source Pollution with Different Release Positions in a Sinuous Open Channel

by 1,2,*,†, 1,2,†, 1,2, 1,2 and 1,2
1
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
2
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Mauro De Marchis
Water 2022, 14(12), 1903; https://doi.org/10.3390/w14121903
Received: 30 April 2022 / Revised: 6 June 2022 / Accepted: 10 June 2022 / Published: 13 June 2022
(This article belongs to the Special Issue Advances in Experimental Hydraulics, Coast and Ocean Hydrodynamics)
The process of pollutant mixing is significantly influenced by secondary flow and turbulence in meandering rivers. To investigate the influence of different point source release positions on the pollutant mixing process in sinuous open channel flows, a 3D large-eddy simulation (LES) model based on OpenFOAM was established to simulate the process of passive scalar transport in a sinuous channel with a rectangular cross-section. After verification by a flume experiment, two sets of cases in which the point sources were arranged at identical intervals in spanwise and streamwise directions were configured to evaluate the mixing efficiency. The effect of flow structure, secondary motion, and the turbulent viscosity on the scalar transport and mixing was discussed. The distribution of scalar as well as the scalar flux was analyzed in detail, and the fluctuation characteristics were also described. The results demonstrate that due to the existence of secondary flow in the sinuous channel, different transverse and streamwise release positions of the point source have significant influence on mixing efficiency and spatial distribution of the pollutant. The point source placed near the center of the cross-section in transverse or near the apex of the bend in streamwise result in higher mixing efficiency. Mixing efficiency calculated by different indices can be different, which requires comprehensive assessment. View Full-Text
Keywords: sinuous open channel flow; point source; pollutant mixing; large-eddy simulation sinuous open channel flow; point source; pollutant mixing; large-eddy simulation
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MDPI and ACS Style

Zhu, H.; Lu, S.; Wang, L.; Xu, J.; Yuan, S. Numerical Study of Mixing Process by Point Source Pollution with Different Release Positions in a Sinuous Open Channel. Water 2022, 14, 1903. https://doi.org/10.3390/w14121903

AMA Style

Zhu H, Lu S, Wang L, Xu J, Yuan S. Numerical Study of Mixing Process by Point Source Pollution with Different Release Positions in a Sinuous Open Channel. Water. 2022; 14(12):1903. https://doi.org/10.3390/w14121903

Chicago/Turabian Style

Zhu, Hai, Shengjie Lu, Lingling Wang, Jieru Xu, and Saiyu Yuan. 2022. "Numerical Study of Mixing Process by Point Source Pollution with Different Release Positions in a Sinuous Open Channel" Water 14, no. 12: 1903. https://doi.org/10.3390/w14121903

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