Numerical experiments on using incline collar rings for controlling mean and fluctuating forces on circular bridge piers

Sabbagh-Yazdi, Saeed-Reza; Bavandpour, Majid

doi:10.1016/j.jfluidstructs.2019.102696

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…In the present study, based on the flow conditions and the range of wave height variations, the maximum measurement error is 5%. A piezometer was also used to measure static pressure [42,43].…”

Section: Model Description and Methodologymentioning

confidence: 99%

Performance Assessment of Shockwaves of Chute Spillways in Large Dams

Mousavimehr

Yamini

Kavianpour

2021

Shock and Vibration

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Spillways are the most important structures of large dams that are responsible for releasing the excessive flood discharge from the reservoir. Although many studies have been performed to determine the flow characteristics over these structures, however, the available information on the shockwaves’ characteristics for spillways’ design is limited. The supercritical flow below the chute piers generates an aerated flow known as shockwaves. Due to the flow interaction with the chute piers, three kinds of standing waves just downstream of the pier, in the middle of the chute, and on the sidewalls are generated. This phenomenon affects the flow domain and its hydraulic characteristics along the chute spillway. The height of the waves increases downstream, where they hit the chute walls and reflect again into the flow to interact together again. The process repeated and intensified downstream in a lozenge shape. The height of these waves can be more than twice the depth flow and thus run over the sidewalls. This is important for the design of chute walls in chute spillways with control gates. In this study, the experimental formation of the shockwaves and their behavior along the chute and their reduction measures are presented. Experiments were conducted on a scaled physical model (1/50) of Kheirabad Dam, Water Research Institute, Iran. It was realized that apart from the geometry of piers and chute spillway, Froude number of flow and gate opening are the main effective parameters on the hydraulic performance of shockwaves’ formation and their development on gated spillways.

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Section: Model Description and Methodologymentioning

confidence: 99%

Performance Assessment of Shockwaves of Chute Spillways in Large Dams

Mousavimehr

Yamini

Kavianpour

2021

Shock and Vibration

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“…The hydrodynamic calculations use the continuity equations for incompressible Newtonian fluids based on the Sabbagh-Yazdi assumptions as well as the equations of motion, both of which confine the flow motion, and the area and volume parameter terms are introduced in the two types of equations that simulate the fluid motion through the software's built-in fractional area/volume obstacle representation (FAVOR) grid technology. The governing equation expressions [20] are as follows:…”

Section: Hydraulics Model 211 Governing Equationmentioning

confidence: 99%

Refined Simulation Study on the Effect of Scour Environments on Local Scour of Tandem Bridge Piers

Gao

Xian-you

2023

Sustainability

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Ice cover is a natural phenomenon unique to rivers in cold regions, and its existence is one of the reasons for the collapse of structural foundations of bridge piers across rivers. In order to understand the influence of different scouring environments on the hydrodynamics and sand bed morphology in the local scour holes around bridge pier foundations, this paper simulates the dynamic evolution process of the local scouring of tandem combination piers under open-flow and ice-cover environments, based on a turbulence model using the Reynolds-averaged Navier Stokes (RANS) method and a sediment transport model considering the slope collapse effect, respectively. This study also takes the vortex flow and shear stress distribution at different characteristic moments of the pier perimeter section as the penetration point to analyze the effect of the influence law of the scouring environment on the morphology and relative time scale of the scour hole, and makes a detailed comparison with the results of the indoor flume test. The results of this study show that: for local scouring in open-flow conditions, sediment initiation is doubly inhibited and the hydrodynamic forces in the scouring hole are weakened; the local scouring caused by ice cover contributes to the total scouring of the submerged pier within its coverage area, which significantly increases the depth and range of the local scouring hole; and, although the interaction of turbulent eddies and shear stress on the pier side is the main dynamic mechanism of the scouring generated around the pier, the two have a strong correlation. The results of this study, obtained by accurately quantifying the amount of eddies and shear stress around the pier, are the basis for the reasonable estimation of the maximum local scouring depth, which can provide a reference for the study of the evolution of the riverbed around submerged structures in cold areas and is essential to avoid structural damage to the piers and reduce the economic loss of traffic..

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“…Thus, during the experimental work, the impact of this factor was considered in the current study. Drag force on baffle blocks (dissipated kinetic energy (ΔE) is a function of different variables; therefore, a dimensional analysis was conducted to generate non-dimensional equations, which in turn are functions for the ratio of (ΔE/E1) or (FB/F2) where flow is turbulent in all laboratory experiments [29,30]. The following equations show the non-dimensional variables:…”

Section: Compute Dissipated Kinetic Energy (δE)mentioning

confidence: 99%

The Effects of Different Shaped Baffle Blocks on the Energy Dissipation

et al. 2020

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Stilling basins can be defined as energy dissipaters constructed of the irrigation systems. This study aims at investigating the performance of the new seven baffle blocks design in terms of reducing the dimensions of stilling basins in irrigation systems. In order to assess the hydraulic efficiency of a new model for baffle block used in stilling basins, a Naval Research Laboratory (NRL) has conducted. The results of this study demonstrate that the performance of the new baffle block, in term of hydraulic jump length reduction and hydraulic energy dissipation, it's better than standard blocks. However, the ratios of the drag resistance attributed to the new baffles block (FB / F2) have been larger than that applied on the normal block. It was found that the new block dissipates the energy by 9.31% more than the concrete block, and decreases the length of the hydraulic jump by 38.6% in comparison with the standard blocks. However, the new block maximizes the drag force ratio by 98.6% in comparison with the standard baffle blocks. The findings indicated that in terms of energy reduction and dissipation in the length of the hydraulic jump, the new block is superior to the other kinds.

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Numerical experiments on using incline collar rings for controlling mean and fluctuating forces on circular bridge piers

Cited by 7 publications

References 12 publications

Performance Assessment of Shockwaves of Chute Spillways in Large Dams

Performance Assessment of Shockwaves of Chute Spillways in Large Dams

Refined Simulation Study on the Effect of Scour Environments on Local Scour of Tandem Bridge Piers

The Effects of Different Shaped Baffle Blocks on the Energy Dissipation

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