Effects of Turbulence Models on the Numerical Simulation of Flow in Open Channel Junction

Yang, Qingyuan; Sun, Yi; Wang, Xianye; Lu, Wen-Hsiang; Wang, Xiekang

doi:10.1080/15376494.2011.621800

Cited by 6 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Standard k-ε, RNG k-ε, and RSM turbulence models At the section immediately after the junction, the secondary flow predicted by the numerical models was smaller than that of the experiment (Yang et al, 2011 Asymmetrical, shaped…”

Section: Asymmetrical Shapedmentioning

confidence: 88%

“…The computational results were compared with the experimental data and showed that the new modeling approach is more accurate than the RANS approach in addition to its ability of saving computational effort comparing to the LES approach. An experiment and 3D numerical simulation were used by Yang et al (2011) [27] to examine the flow in an asymmetrical 90-degree confluent channel. They utilized the standard k-ε, RNG k-ε, and RSM turbulence models to simulate the secondary flows and separation zones, and then the results of the numerical models' predictions and the experimental data were compared and evaluated.…”

Section: Asymmetrical Shapedmentioning

confidence: 99%

See 1 more Smart Citation

Review and Comparison of Numerical Simulations of Secondary Flow in River Confluences

Shaheed

Yan

Mohammadian

2021

Water

View full text Add to dashboard Cite

River confluences are a common feature in natural water resources. The flow characteristics in confluences are complicated, especially at junction areas between tributaries and the main river. One of the typical characteristics of confluences is secondary flow, which plays an important role in mixing, velocity, sediment transport, and pollutant dispersion. In addition to the experimental and field studies that have been conducted in this area, the development of computational fluid dynamics has allowed researchers in this field to use different numerical models to simulate turbulence properties in rivers, especially secondary flows. Nowadays, the hydrodynamics of flows in confluences are widely simulated by using three-dimensional models in order to fully capture the flow structures, as the flow characteristics are considered to be turbulent and three-dimensional at river junctions. Several numerical models have been recommended for this purpose, and various turbulence models have been used to simulate the flows at confluences. To assess the accuracy of turbulence models, flows have been predicted by applying different turbulence models in the numerical model and the results have been compared with other data, such as field, laboratory, and experimental data. The purpose behind these investigations was to find the suitable model for each case of turbulent flow and for different types of confluences. In this study, the performances of turbulence models for confluences are reviewed for different numerical simulation strategies.

show abstract

Section: Asymmetrical Shapedmentioning

confidence: 88%

Section: Asymmetrical Shapedmentioning

confidence: 99%

Review and Comparison of Numerical Simulations of Secondary Flow in River Confluences

Shaheed

Yan

Mohammadian

2021

Water

View full text Add to dashboard Cite

show abstract

“…[6] proposed a theoretical flow pattern according to the experimental observations in that study. Thereafter, the impacts of flow confluences at different channel junctions on the flow pattern and structures were widely investigated through various numerical and experimental studies in the past decades (e.g., [7][8][9][10][11][12][13][14][15][16][17][18][19][20]). All the results of these studies have shown and evidenced that the flow junctions with different properties (e.g., size ratio, angle and water depth change due to concordant/discordant bed) could affect greatly the characteristics of the flow pattern and structures and thus the hydrodynamic responses at the confluence zone, with indicating that the effects of the flow junctions and characteristics have to be considered and included in the hydraulic modeling process so as to obtain better physical interpretations and accurate numerical predictions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Hydrodynamic Influence of River Flow Confluences to the Open Channel Stage-Discharge Relationship

Wang

Yan

et al. 2016

Preprint

Self Cite

View full text Add to dashboard Cite

An accurate assessment of the stage-discharge relationship in open channel flows is necessary and important to the design and management of hydraulic structures and engineering in practical hydrosystems such as rivers and streams. While the flow structures and patterns at open channel junctions are interesting and have been widely studied in the literature, this paper focuses further on the effect of flow junctions on stage-discharge relationship at mountain river confluences. In this study, both the flume and physical model experiments are designed and performed carefully to test and analyze the complex flow structures and characteristics at river confluences with different configurations and hydraulic conditions. The impacts of the flow junctions on the traditional stage-discharge relationship are analyzed in this study. The results of this study are discussed in the paper for the understanding of flow structures at flow junctions and the design and management of hydraulic structures in river engineering.

show abstract

“…Figure 1(b) shows the threedimensional view of the confluence flow [4]. Due to the differences of centrifugal forces along the vertical direction, a secondary circulation is generated [5][6][7]. The separation zone and secondary circulation have significant impacts on the sediment transport [2,8,9] and the pollutant dispersion [10][11][12][13][14][15][16][17][18][19][20][21] in confluence region.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Confluence Flow in Open Channel with Dynamic Meshes Techniques

Yang

Liu

et al. 2013

Advances in Mechanical Engineering

View full text Add to dashboard Cite

Due to the interaction between branch flow and main stream at confluence zone in open channel, the water level of free surface often varies dramatically. In three dimensional simulations of confluence flow, multi-phase models are usually adopted in treating the free-surface boundary, for example, the Volume of Fluid model. The major dilemma for adopting multi-phase modes is that the method consumes more time and computation resources. In this study, the new mesh technique, the dynamic meshes, is adopted to track the position of free surface. The simulation results show that simulation adopting dynamic meshes converges rapidly and is in good agreement with the experimental data. In addition, simulations and comparisons of different turbulence models coupled with dynamic meshes, rigid lid, or the Volume of Fluid method are carried out to investigate the impact by tracing the free-surface boundary. The simulated position of free surface, velocity distribution, and vector field are all compared to the data collected in the flume test. The results of numerical simulations of confluence flow using the dynamic meshes present much better accuracy than those of Volume of Fluid or rigid-lid method, although they take the same turbulence model.

show abstract

Effects of Turbulence Models on the Numerical Simulation of Flow in Open Channel Junction

Cited by 6 publications

References 10 publications

Review and Comparison of Numerical Simulations of Secondary Flow in River Confluences

Review and Comparison of Numerical Simulations of Secondary Flow in River Confluences

Experimental Study on the Hydrodynamic Influence of River Flow Confluences to the Open Channel Stage-Discharge Relationship

Numerical Simulation of Confluence Flow in Open Channel with Dynamic Meshes Techniques

Contact Info

Product

Resources

About