Turbulent structures and local scour around a cylindrical pier under unsteady flows

Misuriya, Gaurav; Eldho, T. I.

doi:10.1007/s10652-023-09951-z

Cited by 3 publications

(1 citation statement)

References 44 publications

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“…Several factors can affect the mechanism of local scouring around bridge piers, including the shape and size of the pier, the flow velocity, the sediment size and type, and the water depth. Detailed studies have confirmed the existence and importance of the horseshoe vortex in the scouring process around bridge piers (Breusers et al 1977, Raudkivi 1986, Kothyari et al 1992, Graf and Istiarto 2002, Arneson et al 2012, Wang et al 2017a, Kaveh et al 2021, Misuriya and Eldho 2023. The creation of the horseshoe vortex and the process of local scouring around the bridge pier is presented in figure 2.…”

Section: Mechanism Of Scouring Around Bridge Piersmentioning

confidence: 71%

Scouring around bridge pier: a comprehensive review of countermeasure techniques

Baranwal,

Das

2024

Eng. Res. Express

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Scouring around bridge piers significantly threatens bridge stability and can cause tragic failures if not addressed effectively. Several remedial techniques have been developed to reduce local scour depth around bridge piers, including using scour countermeasures such as riprap, collar plate, slot, submerged vane, sacrificial pile, etc. These countermeasures can be used alone or in combination to provide additional protection against local scour. The selection of countermeasures depends on flow velocity, river bed sediment type, and bridge geometry. A thorough analysis of these factors is necessary before selecting a countermeasure. In this paper, an attempt has been made to summarize the efficiency of different remedial techniques to reduce scour depth around the bridge pier. The stability of the bed armouring device depends on its depth and installation position around the bridge pier, and its efficiency decreases as flow velocity increases. It is found that significant scour protection devices are more efficient in clear water scouring (CWS) conditions (V/Vc1.0) than live bed scouring (LBS) conditions (V/Vc>1.0). The combination of flow-altering devices is crucial in reducing scour, with a collar plate and slot combination being more effective than a single slot. The findings of this review paper are to provide a valuable resource for engineers and policymakers seeking to design and implement effective strategies for mitigating local scour around bridge piers.Keywords: Local scour, bridge pier, remedial technique, bed armouring devices, flow-altering devices

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Section: Mechanism Of Scouring Around Bridge Piersmentioning

confidence: 71%

Scouring around bridge pier: a comprehensive review of countermeasure techniques

Baranwal,

Das

2024

Eng. Res. Express

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Turbulent Flow Field and Scour Characteristics around Bridge Pier in Combined Wave and Current Conditions

Misuriya,

Eldho,

Mazumder

2024

J. Waterway, Port, Coastal, Ocean Eng.

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Effects of submergence ratio on flow around a circular pier in combined wave–current flows using particle image velocimetry

Aravind,

Eldho,

Mazumder

2024

Physics of Fluids

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The present study illustrates an experimental investigation of flow hydrodynamics in the vicinity of a submerged circular pier across various submergence levels under only current and wave–current combined flow conditions. The instantaneous velocity data are collected using particle image velocimetry for three distinct frequencies of waves to determine the influence of wave superimposition on the current-induced turbulence parameters. The distribution of phase averaged turbulence quantities, such as mean velocities, Reynolds shear stress, turbulent kinetic energy, flow patterns, and vorticity analysis by Q-criterion, are presented. The results provide insight into the impacts of wave frequency and submergence ratio on the formation of horseshoe vortices, trailing vortex, and reverse flow zones. From the results it is observed that a decrease in the submergence level of the structure causes the formation of strong horseshoe vortices and reverse flow zones in the absence of waves. Also, an increase in wave frequency intensifies the turbulence kinetic energy at the upstream of the pier and eddy generation behind the pier. The present findings highlight the effects of pier submergence and wave characteristics, such as frequency, wave height, and wave period, on flow patterns and turbulent flow characteristics and aid in the design of marine structures. Furthermore, experimental data serve as a valuable resource for validating theoretical or mathematical models related to combined wave–current environments.

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Turbulent structures and local scour around a cylindrical pier under unsteady flows

Cited by 3 publications

References 44 publications

Scouring around bridge pier: a comprehensive review of countermeasure techniques

Scouring around bridge pier: a comprehensive review of countermeasure techniques

Turbulent Flow Field and Scour Characteristics around Bridge Pier in Combined Wave and Current Conditions

Effects of submergence ratio on flow around a circular pier in combined wave–current flows using particle image velocimetry

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