Physical and Numerical Modeling of Large Headwater Ratios for a 15° Labyrinth Spillway

Savage, Bruce; Crookston, Brian M.; Paxson, Greg

doi:10.1061/(asce)hy.1943-7900.0001186

Cited by 55 publications

(16 citation statements)

References 14 publications

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“…VOF has been shown to be able to reproduce complex experimental and real free surface flow phenomena. Examples of the application of VOF to simulate flow over labyrinth weirs can be found in Crookston et al (2012) Paxson and Savage (2006) or Savage et al (2016). Furthermore, the capability of CFD models to simulate the prototype scale make it possible to utilise numerical simulations to determine scale effects of a physical model.…”

Section: Introductionmentioning

confidence: 99%

Investigating Scale Effects of a Hydraulic Physical Model with 3D CFD

Torres

Borman

Sleigh

et al. 2018

Smart Dams and Reservoirs

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SYNOPSISIn the present study, the three-dimensional (3D) Computational Fluid Dynamics (CFD) Volume of Fluid (VOF) method is validated to reproduce hydraulic free surface flows over a labyrinth weir and a spillway for several flow rates using the open source toolbox OpenFOAM 3.0.1 and the commercial CFD package ANSYS Fluent 17.2. The CFD solvers are employed to simulate the 1:25 scale Froude number similarity physical model of the scheme, with validation conducted using experimental observations and measurements. It is found that both solvers are capable of accurately reproducing the velocities and depths measured in the physical model and are also able to capture complex flow features. The models are applied to simulate the prototype hydraulic flows so that scale effects from the physical model can be quantified. Results show the overall decrease in water depth and increase in velocity in the prototype can be up to 15% and 10%, respectively, for the lower flow rates, with scale effects reducing for larger flow rates. The prototype scale simulations also exhibit some variation in the labyrinth weir rating curve when compared to the scaled case; showing lower heads upstream of the crest for the same discharge. As theory would suggest, discrepancies in the rating curve at the two scales are more pronounced for low flow rates.

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Section: Introductionmentioning

confidence: 99%

Investigating Scale Effects of a Hydraulic Physical Model with 3D CFD

Torres

Borman

Sleigh

et al. 2018

Smart Dams and Reservoirs

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show abstract

“…After that, B.M. Savage [20] and Liu [21] used this method to judge the convergence of the grid. When using the GCI convergence factor to judge, the grid size should be 3 or more.…”

Section: Convergence Of Gridmentioning

confidence: 99%

Numerical and Experimental Investigations of Flow Pattern and Anti-Vortex Measures of Forebay in a Multi-Unit Pumping Station

Yang

Zhang

Liu

et al. 2021

Water

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The forebay of a pumping station is an important building connecting the diversion channel and the intake pool. Based on the physical model test and research method of computational fluid dynamics (CFD) based on the improved fluid volume model, the flow field in a forebay of a multi-unit pumping station is analyzed in combination with the engineering practice of the Exi River flood discharge station in the Anhui Province, China. Aiming at the technical problems of a large-scale swing water area in the forebay internal flow field of a lateral intake pumping station, the technical problems are discussed. Different rectification measures are selected to adjust the flow pattern in the forebay of a pumping station. The internal rectification flow pattern in the forebay under different plans, the uniformity of flow velocity distribution in the measurement section, and the reduction rate of the vortex area are studied and compared, and the optimal plan is given. The results show that the flow pattern of the 7.5 m and 15 m solutions of the lengthened inflow wall is still poor, and the ability to eliminate vortices is not strong or even counterproductive. The combination plan of a rectifier sill and a rectifier pier has a better effect and can eliminate more than 90% of the vortex, but the uniformity of flow speed has not been significantly improved at the inlet of the pumping station; the combination plan of a rectifier sill and a diversion wall opening has the best effect; the reduction rate of the vortex area is more than 85%, and the velocity uniformity of three measuring sections is better than that of the original plan. The uniformity of flow rate near the pumping station is increased by 4% and that far away from the pumping station is increased by 13%. The combination plan of a rectifier sill and diversion wall with openings is recommended.

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“…Prior to the implementation of these cases, the grid convergence index (GCI) is necessary to be computed from the numerical-model mesh-refinement method [51,52]. Turbulence kinetic energy (TKE), which varies with simulation time because of landslide movement and wave propagation [5,8], is chosen to validate calculation convergence with a minimum four-mesh resolution.…”

Section: Numerical Casesmentioning

confidence: 99%

Efficient and Accurate 3-D Numerical Modelling of Landslide Tsunami

Chen

et al. 2019

Water

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High-speed and accurate simulations of landslide-generated tsunamis are of great importance for the understanding of generation and propagation of water waves and for prediction of these natural disasters. A three-dimensional numerical model, based on Reynolds-averaged Navier–Stokes equations, is developed to simulate the landslide-generated tsunami. Available experiment data is used to validate the numerical model and to investigate the scale effect of numerical model according to the Froude similarity criterion. Based on grid convergence index (GCI) analysis, fourteen cases are arranged to study the sensitivity of numerical results to mesh resolution. Results show that numerical results are more sensitive to mesh resolution in near field than that in the propagation field. Nonuniform meshes can be used to balance the computational efficiency and accuracy. A mesh generation strategy is proposed and validated, achieving an accurate prediction and nearly 22 times reduction of computational cost. Further, this strategy of mesh generation is applied to simulate the Laxiwa Reservoir landslide tsunami. The results of this study provide an important guide for the establishment of a numerical model of the real-world problem of landslide tsunami.

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Physical and Numerical Modeling of Large Headwater Ratios for a 15° Labyrinth Spillway

Cited by 55 publications

References 14 publications

Investigating Scale Effects of a Hydraulic Physical Model with 3D CFD

Investigating Scale Effects of a Hydraulic Physical Model with 3D CFD

Numerical and Experimental Investigations of Flow Pattern and Anti-Vortex Measures of Forebay in a Multi-Unit Pumping Station

Efficient and Accurate 3-D Numerical Modelling of Landslide Tsunami

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