Three-Dimensional Numerical Study of Flows in Open-Channel Junctions

Huang, Jianchun; Weber, Larry; Lai, Yong G.

doi:10.1061/(asce)0733-9429(2002)128:3(268)

Cited by 186 publications

(94 citation statements)

References 14 publications

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“…These values are very close to the experimental one of 0.306. In comparison with the previous study results (for example, Huang et al 8) ), the present predicted results are better in terms of water-surface mapping and the minimum water surface elevation (this minimum elevation predicted with Huang et al 8) is 0.311). The main reason may be attributed to non-hydrostatic pressure considered and effect of surface tension and viscosity is taken into account in evaluating dynamic boundary condition.…”

Section: (2) Water Surface Elevationsupporting

confidence: 56%

“…At the boundary inlets, the value of k is chosen to be (0.05U) 2 (U=average velocity at each inlet); the level of ε is determined from the value of k at the inlets and Eq. (8) by specifying the ratio D t /ν=100. In order to consider effect of the rapid attenuation of turbulence intensities in the vertical direction near the free surface, the following damping function, f s , is multiplied to the eddy viscosity.…”

Section: (4) Boundary Conditionsmentioning

confidence: 99%

“…As well as two-dimensional numerical model, there were a few of studies using three-dimensional numerical model to address with the confluence flow. Huang et al 8) developed and validated a three-dimensional numerical model in order to investigate the effect of junction angle on the confluence flow. In their study, hydrostatic pressure was assumed and the k-ω turbulence model was used to calculate the turbulence eddy viscosity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Three-Dimensional Simulation of Flow at an Open-Channel Confluence With Turbulence Models

Thanh

Kimura

Shimizu

2011

J. JSCE

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Open-channel confluence flows are common in natural river systems as well as in environmental and hydraulic engineering, such as in river engineering. Often, these flows are three-dimensional and complex, while numerical studies fully describing confluence flow are still few. This paper presents the results of investigation of confluence flow using a three-dimensional numerical model with the linear and nonlinear k-ε models. To treat the dynamic boundary condition at the free surface, non-hydrostatic pressure is included in the present model. The model is validated using the experimental data available. Adequacy of the present model with two turbulence models above is indicated based on the result analysis. The nonlinear model is indicated as the more advantageous one than the linear one.

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Section: (2) Water Surface Elevationsupporting

confidence: 56%

Section: (4) Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Simulation of Flow at an Open-Channel Confluence With Turbulence Models

Thanh

Kimura

Shimizu

2011

J. JSCE

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“…The measurement data published by Weber et al (2001) and simulated by Huang et al (2002) allows for comparison of velocities as well as water depths. Both measurements and simulations indicate an upstream effect into the tributary, with the same patterns of flow contraction and water surface depressions near the downstream corner.…”

Section: Discussionmentioning

confidence: 99%

Experimental investigation of the flow evolution in the tributary of a 90° open channel confluence

Creëlle¹,

Schindfessel²,

Ramos³

et al. 2016

River Flow 2016

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“…Numerical flow models have also been used to reproduce the observed flow structures [4,5] from the viewpoint of fluid mechanics. However, the obtained results are not very practical because the test flumes were often straight and had rectangular cross sections, which amount to an oversimplification of the configurations of real rivers.…”

Section: Introductionmentioning

confidence: 99%

Flood flow at the confluence of compound river channels

Ishikawa¹,

Akoh²,

Arai³

2015

WIT Transactions on Ecology and the Environment

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The implementation of a compound cross section is often used to enhance a river system by increasing the channel capacity for high water and stabilizing the stream during low water. The design of the confluence is one of the most difficult aspects of the implementation of a compound channel because the streamlines during high water may deviate from the banks of the low-water channel depending on the inflow conditions. This paper reports a field study on flood flow at the confluence of the Tone River and Watarase River in Japan, wherein aerial photograph analysis and numerical flow simulation were employed. The surface velocity field was obtained by stereo image analysis of the aerial photographs taken at a flood peak in 1981. The analysis revealed the occurrence of flow divergence and convergence across the banks of the lowwater channel as well as flow stagnation around the tree communities in the high-water channel. A quasi-3D shallow water model with an unstructured triangular mesh system was used to simulate the flow field. The drag force of the tree communities was also taken into consideration based on the results of a field survey. The simulation fairly well reproduced the surface flow field obtained by image analysis. The calculated difference between the streamlines at the surface and bottom of the water suggested that dispersive stress may have significantly affected the flow near the banks of the low-water channel, especially around the tree communities.

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Three-Dimensional Numerical Study of Flows in Open-Channel Junctions

Cited by 186 publications

References 14 publications

Three-Dimensional Simulation of Flow at an Open-Channel Confluence With Turbulence Models

Three-Dimensional Simulation of Flow at an Open-Channel Confluence With Turbulence Models

Experimental investigation of the flow evolution in the tributary of a 90° open channel confluence

Flood flow at the confluence of compound river channels

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