A three-phase flow simulation of local scour caused by a submerged wall jet with a water-air interface

Lee, Cheng-Hsien; Xu, Conghao; Huang, Zhenhua

doi:10.1016/j.advwatres.2017.07.017

Cited by 36 publications

(16 citation statements)

References 44 publications

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“…The scouring process occurs because of the presence of a complex vortex system. This system consists of horseshoe vortex, wake vortex, trailing vortex, and bow wave vortex [1,2]. In recent years, several studies have been carried out to investigate the effect of different factors on the formation of vortex systems around bridge piers.…”

Section: Introductionmentioning

confidence: 99%

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

Farooq

Ghumman

2019

Water

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Previous experimental research on utilizing pier modifications as countermeasures against local scour has focused primarily on circular pier. It is of utmost importance to further investigate the most suitable pier shape for pier modification countermeasure separately and in combination. This experimental study aims to reduce the stagnation of the flow and vortex formation in front of the bridge pier by providing a collar, a hooked collar, a cable, and openings separately and in combination around a suitable pier shape. Therefore, six different pier shapes were utilized to find out the influence of pier shape on local scouring for a length-width ratio smaller than or equal to 3. A plain octagonal shape was shown as having more satisfactory results in reducing scour compared to other pier shapes. Furthermore, the efficiency of pier modification was then evaluated by testing different combinations of collar, hooked collar, cable, and openings within the octagonal bridge pier, which was compared to an unprotected octagonal pier without any modification. The results show that by applying such modifications, the scour depth reduced significantly. The best combination was found to be a hooked collar with cable and openings around an octagonal pier. It was revealed that the best combination reduced almost 53% of scour depth, as compared to an unprotected octagonal pier.

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Section: Introductionmentioning

confidence: 99%

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

Farooq

Ghumman

2019

Water

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“…Local scour around a hydraulic structure such as a bridge pier or abutment is caused by the enhanced transport capacity of sediment around a structure and by the formation of vortices. Excessive local scouring compromises the stability of these structures and has been attributed to be the main cause of bridge pier failure [1,2]; hence, reducing the maximum local scour depth at bridge piers has been a topic of safe design. The flow field at a pier is coupled with a complex horseshoe vortex system initiated from the downflow upstream of the pier, which is thought to be the major impelling process behind the growth of the scour depth, and wake vortices downstream of the pier [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Hooked-Collar for Bridge Piers Protection: Flow Fields and Scour

Chen

Tfwala

Wu³

et al. 2018

Water

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A new type of collar, the hooked-collar, was studied through experiments and numerical methods. Tests were conducted using a hooked collar of a width of 1.25b and a height of 0.25b, where b is the bridge-pier width. The hooked-collar efficiency was evaluated by testing different hooked-collar placements within the bridge-pier, which were compared to the bridge-pier without any collar. A double hooked-collar configuration, one placed at the bed level and the other buried 0.25b, was the most efficient at reducing the scour hole. In other cases, a hooked-collar positioned 0.25b above the bed slightly reduced the scour hole and had similar scour patterns when compared to the pier without the hooked-collar. The flow fields along the vertical symmetrical plane in the experiments are also presented. Laboratory experiments and numerical tests show that maximal downflow is highly reduced along with a corresponding decrease in horseshoe vortex strength for the experiments with the hooked-collar, compared to cases without the hooked-collar. The flow fields reveal that the maximum turbulent kinetic energy decreases with the installation of the hooked-collar.

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“…0, Rusche [34] suggests that the momentum equations (Eqs. (38) and (40)) should be converted into the following "phase-intensive" form by dividing ρ f 1 À c ðÞ and ρ s c:…”

Section: Semidiscretized Forms Of the Governing Equationsmentioning

confidence: 99%

“…This section briefly describes two examples that have been studied using the two-phase flow models described. The problem descriptions and numerical setups for these two problems are included here; for other relevant information, the reader is referred to Lee and Huang [35] and Lee et al [38].…”

Section: Applicationsmentioning

confidence: 99%

“…For numerical simulations, this problem includes water (fluid phase) and sediment (solid phase) and is best modeled by a liquid-solid two-phase flow approach. In the following, the numerical setup and main conclusions used in Lee et al [38] are briefly described. The experimental setup of Chatterjee et al [39] is shown in Figure 2.…”

Section: Scour Downstream Of a Sluice Gatementioning

confidence: 99%

See 1 more Smart Citation

Modeling of Fluid-Solid Two-Phase Geophysical Flows

Huang¹,

Lee²

2019

Advanced Computational Fluid Dynamics for Emerging Engineering Processes - Eulerian vs. Lagrangian

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Fluid-solid two-phase flows are frequently encountered in geophysical flow problems such as sediment transport and submarine landslides. It is still a challenge to the current experiment techniques to provide information such as detailed flow and pressure fields of each phase, which however is easily obtainable through numerical simulations using fluid-solid two-phase flow models. This chapter focuses on the Eulerian-Eulerian approach to two-phase geophysical flows. Brief derivations of the governing equations and some closure models are provided, and the numerical implementation in the finite-volume framework of OpenFOAM® is described. Two applications in sediment transport and submarine landslides are also included at the end of the chapter.

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A three-phase flow simulation of local scour caused by a submerged wall jet with a water-air interface

Cited by 36 publications

References 44 publications

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

Impact Assessment of Pier Shape and Modifications on Scouring around Bridge Pier

A Hooked-Collar for Bridge Piers Protection: Flow Fields and Scour

Modeling of Fluid-Solid Two-Phase Geophysical Flows

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