A Hybrid Model for Simulating Velocity Field of a River with Complex Geometry Plunged by Multiple Jets

Li, Lianxia; Liao, Huasheng; Li, Tian-xiang

doi:10.1016/s1001-6058(07)60017-1

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…The turbulent equations (8)(9)(10)(11)(12)(13)(14)(15) are closed as the initial and boundary conditions are determined. In this paper, the Variable Density Turbulent Buoyant Jet is taken into account by introducing the density state equation.…”

Section: Anisotropic Turbulent Buoyant Jet Modelmentioning

confidence: 99%

Multiple Objectives for Genetically Optimized Coupled Inversion Method for Jet Models in Flowing Ambient Fluid

Liang

et al. 2014

Engineering Applications of Computational Fluid Mechanics

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ABSTRACT:Optimal dilution and the lowest possible energy consumption are essential environmental and economic objectives for deep sea sewage discharge. In this paper, a new method with multiple parameters and objectives, nonlinear, genetically optimized and coupled inversion for determining jet ratios and angles was established by coupling Genetic Algorithms (GAs) with Anisotropic Turbulent Buoyant Jet Models with variable densities to achieve these objectives. The multiple objectives were taken into account for the jet model and the Operation Energy Consumption Equation was input into the GAs. Real coding methodology was utilized to avoid the precision losses of binary coding. A multiple parameters matching designed cases methodology was used to improve the convergence velocity. The fluctuated convergence curves that were utilized for searching for the optimal multiple parameters showed that the present method is suitable for the multiple objectives optimizing inversion problem. The numerical results of the re-calibrations and comparisons showed that the multiple parameters and objectives, nonlinear, genetically optimized and coupled inversion method has the advantages of improving the jet's water mixing efficiency with environmental waters, while also reducing the energy consumption. The optimal multiple parameters of a jet ratio of 4, and a jet angle of 90 degrees, satisfy the demands of the multiple objectives.

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Section: Anisotropic Turbulent Buoyant Jet Modelmentioning

confidence: 99%

Multiple Objectives for Genetically Optimized Coupled Inversion Method for Jet Models in Flowing Ambient Fluid

Liang

et al. 2014

Engineering Applications of Computational Fluid Mechanics

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“…Pagliara et al (2012) analyzed the impact of vertical jets colliding at different angles and provided relationships to predict the main parameters of the scour geometry, including the maximum scour depth, scour hole length and scour hole width. Li et al (2006) studied the impact of multiple jets on the scour formed downstream of the Xiluodu power plant on the Yangtze River. A hybrid model combining physical and numerical models was used to simulate the velocity field with several jets.…”

Section: Introductionmentioning

confidence: 99%

Effect of sediment gradation on scour by symmetric crossing jets: an experimental investigation

2022

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A laboratory study with 162 experiments was designed and conducted to investigate the effect of three non-uniform sediment samples on the scour morphology by the symmetric crossing jets. The bed sediment materials with close median diameter values and different non-uniformities were utilized to investigate the scour at various crossing angles. The results were also compared with the equivalent single jet. The proper novel relationships were presented to predict the scour hole depth, and dimensions. The results showed that at a crossing angle of 30° with low and medium tailwater depth, the scour depth increases with increasing the non-uniformity of the bed materials. At the crossing angle of 30°, the armor layer was created perfectly that was thick on the bottom of the scour hole, but for the crossing angles of 70° and 110° it was thin and was a mixture of the coarse and fine particles. At low tailwater depth at the crossing angles of 70° and 110°, by increasing the non-uniformity of the sediments, the scour tended to be more asymmetric. At the high tailwater depth, for the crossing angles of 70° and 110° the scouring was less than that of the crossing angle of 30° and single jet.

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“…Zhang and Mai (2008) performed 3D numerical simulations of the dynamic flow characteristics of a water jet in a hybrid type flip bucket. Li et al (2006) used a hybrid model to simulate the flow fields in a river with complicated geometries including multiple jets. Li and Zhou (2004) used a Lagrange particle method based on SPH to simulate the flood discharge flow from a breaking dam with the result agreeing well with experimental data.…”

Section: Introductionmentioning

confidence: 99%

Prototype and numerical studies of interference characteristics of two ski-jump jets from opening spillway gates

Xiao

Wang

Zeng

et al. 2015

Engineering Computations

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Purpose -The purpose of this paper is to experimentally and numerically investigate the interference characteristics between two ski-jump jets on the flip bucket in a large dam spillway when two floodgates are running. Design/methodology/approach -The volume of fluid (VOF) method together with the Realizable k-ε turbulence model were used to predict the flow in two ski-jump jets and the free surface motion in a large dam spillway. The movements of the two gates were simulated using a dynamic mesh controlled by a User Defined Function (UDF). The simulations were run using the prototype dam as the field test to minimize errors due to scale effects. The simulation results are compared with field test observations. Findings -The transient flow calculations, accurately predict the two gate discharges compared to field data with the predicted ski-jump jet interference flow pattern similar to the observed shapes. The transient simulations indicate that the main reason for the deflected nappe is the larger opening difference between the two gates as the buttress side gate closes. When both gates are running, the two ski-jump jets interfere in the flip bucket and raise the jet nappe to near the buttress to form a secondary flow on this jet nappe surface. As the gate continues to close, the nappe surface continues to rise and the surface secondary flow become stronger, which deflects the nappe over the side buttress. Originality/value -A dynamic mesh is used to simulate the transient flow behavior of two prototype running gates. The transient flow simulation clarifies the hydraulics mechanism for how the two ski-jump jets interfere and deflect the nappe.

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A Hybrid Model for Simulating Velocity Field of a River with Complex Geometry Plunged by Multiple Jets

Cited by 9 publications

References 2 publications

Multiple Objectives for Genetically Optimized Coupled Inversion Method for Jet Models in Flowing Ambient Fluid

Multiple Objectives for Genetically Optimized Coupled Inversion Method for Jet Models in Flowing Ambient Fluid

Effect of sediment gradation on scour by symmetric crossing jets: an experimental investigation

Prototype and numerical studies of interference characteristics of two ski-jump jets from opening spillway gates

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