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Open AccessReview

A Review of Numerical Simulations of Secondary Flows in River Bends

1
Department of Civil Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa, ON K1N 6N5, Canada
2
Department of Water Resources Engineering, Dalian University of Technology, Dalian 116024, China
*
Authors to whom correspondence should be addressed.
Academic Editors: Ahmad Shakibaeinia and Amir Reza Zarrati
Water 2021, 13(7), 884; https://doi.org/10.3390/w13070884
Received: 21 February 2021 / Revised: 15 March 2021 / Accepted: 18 March 2021 / Published: 24 March 2021
(This article belongs to the Special Issue Computational Fluid Mechanics and Hydraulics)
River bends are one of the common elements in most natural rivers, and secondary flow is one of the most important flow features in the bends. The secondary flow is perpendicular to the main flow and has a helical path moving towards the outer bank at the upper part of the river cross-section, and towards the inner bank at the lower part of the river cross-section. The secondary flow causes a redistribution in the main flow. Accordingly, this redistribution and sediment transport by the secondary flow may lead to the formation of a typical pattern of river bend profile. It is important to study and understand the flow pattern in order to predict the profile and the position of the bend in the river. However, there are a lack of comprehensive reviews on the advances in numerical modeling of bend secondary flow in the literature. Therefore, this study comprehensively reviews the fundamentals of secondary flow, the governing equations and boundary conditions for numerical simulations, and previous numerical studies on river bend flows. Most importantly, it reviews various numerical simulation strategies and performance of various turbulence models in simulating the flow in river bends and concludes that the main problem is finding the appropriate model for each case of turbulent flow. The present review summarizes the recent advances in numerical modeling of secondary flow and points out the key challenges, which can provide useful information for future studies. View Full-Text
Keywords: river bends; secondary flow; numerical model; flow field river bends; secondary flow; numerical model; flow field
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MDPI and ACS Style

Shaheed, R.; Mohammadian, A.; Yan, X. A Review of Numerical Simulations of Secondary Flows in River Bends. Water 2021, 13, 884. https://doi.org/10.3390/w13070884

AMA Style

Shaheed R, Mohammadian A, Yan X. A Review of Numerical Simulations of Secondary Flows in River Bends. Water. 2021; 13(7):884. https://doi.org/10.3390/w13070884

Chicago/Turabian Style

Shaheed, Rawaa; Mohammadian, Abdolmajid; Yan, Xiaohui. 2021. "A Review of Numerical Simulations of Secondary Flows in River Bends" Water 13, no. 7: 884. https://doi.org/10.3390/w13070884

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