Experimental investigation of scour around semi-conical piers under steady current action

Aghaee-Shalmani, Yasin; Hakimzadeh, Habib

doi:10.1080/19648189.2014.968742

Cited by 15 publications

(5 citation statements)

References 17 publications

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“…The flow past semi-conical piers vertically mounted on the bed was simulated based on the configurations in the experimental study of flow and scour around semi-conical piers by Aghaee-Shalmani and Hakimzadeh (2015). Semi-conical piers with various side slopes α = 0 • , 5 • , 10 • and 15 • were tested in the numerical model.…”

Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

“…Bozkus and Yildiz (2004); Vaghefi et al (2016) reported reducing scour depth for inclined pier toward the downstream. Sumer et al (1995); Fredsøe and Sumer (1997); Pourahmadi and Hakimzadeh (2011); Aghaee-Shalmani and Hakimzadeh (2015) in their experimental studies have shown that the semi-conical piers can reduce the scour depth. Sumer et al (1995) indicated that the bed shear stresses around cone-shaped piers are decreased as the side slopes are increased, and robustness of the horseshoe vortices are mainly reduced compared to a circular cylinder (Sumer et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Large eddy simulation of flow around semi-conical piers vertically mounted on the bed

Aghaee-Shalmani

Hakimzadeh

2022

Environ Fluid Mech

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In this paper, details, and results of three-dimensional numerical modeling of flow around the semi-conical piers vertically mounted on the bed in a channel, are presented. For flow simulation, 3-D Navier-Stokes equations are solved numerically using the finite volume method and large eddy simulation (LES). In this study, the semi-conical piers with different side slope angles are tested, and the flow around them is compared with the cylindrical reference pier. Flow structures, vortex shedding behind piers, horseshoe vortices, instantaneous and time-averaged flow structures are presented and discussed. Numerical model results show that the semi-conical piers are eventuated remarkable reduction (up to 25%) in downward flow velocity in the upstream side of the piers, and much more reduction (up to 46%) in bed shear stresses in comparison with the cylindrical pier. Moreover, the model results showed some decrease in vortex shedding frequency for the semi-conical piers compared to the cylindrical pier.We report on numerical results of large eddy simulation of the flow around semi-conical piers with different side slopes. This research is significant because of the effect of these piers on the:reduction of the downward flow and the bed shear stress around the piers.reduction of vortex shedding frequency for the semi-conical piers compared to the cylinder.different behavior of the horseshoe vortices at the upstream compared to the cylinder.

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Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of flow around semi-conical piers vertically mounted on the bed

Aghaee-Shalmani

Hakimzadeh

2022

Environ Fluid Mech

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“…The results showed that external sweep and internal ejection events were an effective mechanism for sediment entrainment around a single circular bridge pier. Aghaee-Shalmani & Hakimzadeh [10] presented the experimental results of scour around semi-conical piers to show the effect of their lateral slopes on the scour depth under steady current. The results showed that the scour depth of the pier with circular section with the largest lateral slope angle was reduced about 36 and 53% at the upstream and downstream sides of the pier in comparison with those of the circular cylinder, respectively.…”

Section: Introductionmentioning

confidence: 99%

The effect of circular bridge piers with different inclination angles toward downstream on scour

Vaghefi

Ghodsian

Salimi

2016

Sadhana

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A fundamental principle in the safe design of bridge piers is to estimate maximum scour depth. As such, many researchers devoted their efforts to study the phenomenon of scour around bridge piers and to present relationships to estimate maximum scour depth. In the current research, scour around circular bridge piers with two different diameters and different inclination angles toward downstream has been investigated experimentally under clear water and different discharges. The obtained results revealed that increase in the inclination angle leads to a significant decrease in the scour depth, dimensions of sediment ridge and scour hole. Moreover, by comparing the data obtained from vertical bridge pier and well-known relationships, a relationship having the most agreement with the results was selected and modified to estimate equilibrium scour depth around inclined piers.

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“…Finally Aghaee-Shalmani, and Hakimzadeh. [9] and Al-tameemi et al [10] used in their research works semi conical pier but Al-tameemi et al [10] used upstream curved face too with the conical pier .The study was confined to clear-water flow around bridge piers with nonuniform sediment sizes.The main objective of the present study was to determine the best system which combines several countermeasures to reduce the local scour as much as possible.…”

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confidence: 99%

“…): Comparison between calculated and measured relative scour depth for oblong pier using Eqns (9). and(15).…”

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confidence: 99%

Reduction of Local Scour around Bridge Piers Using Different Countermeasures.(Dept.C)

Allam

Shamaa

2021

MEJ. Mansoura Engineering Journal

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 I. INTRODUCTION COUR is a common phenomenon caused by the erosive behavior of flowing water on river and alluvial channel beds and side slopes. Scour is defined as the erosion of the streaming sediment in a flow field around a blockage. Breusers et al. [1] defined scour as a natural phenomenon caused by the accumulation and movement of water in rivers and alluvial channel. Scouring process has the ability to damage the structural integrity of bridges and hydraulic structures. It can eventually lead to failure when systemic foundations are compromised. Due to

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Experimental investigation of scour around semi-conical piers under steady current action

Cited by 15 publications

References 17 publications

Large eddy simulation of flow around semi-conical piers vertically mounted on the bed

Large eddy simulation of flow around semi-conical piers vertically mounted on the bed

The effect of circular bridge piers with different inclination angles toward downstream on scour

Reduction of Local Scour around Bridge Piers Using Different Countermeasures.(Dept.C)

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