Hydromorphological Numerical Model of the Local Scour Process Around Bridge Piers

Omara, Hamdy A.; Elsayed, Sami M.; Abdeelaal, G. M.; Abd-Elhamid, Hany F.; Tawfik, Ahmed

doi:10.1007/s13369-018-3359-z

Cited by 26 publications

(16 citation statements)

References 43 publications

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“…In order to obtain the closest results in the numerical simulation of local scour around the bridge pile foundation, Omara et al [54] modeled the bed-load transport parameters of sediment scour by comparing three equations, resulting in the Van Rijn equation model with results rather close to those obtained by Ahmed & Rajaratnam's [37] experimental study. Therefore, the Van Rijn equation model is applied in this numerical study.…”

Section: Van Rijn Equation [53]mentioning

confidence: 98%

Numerical Simulation of Local Scour around Three Cylindrical Piles in a Tandem Arrangement

Tang

Puspasari

2021

Water

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Scouring is one of the most common potential causes of bridge pile foundation failure, with loss of life, economic and environmental impacts. Comprehensive studies on the numerical simulation of local scour around pile groups are still limited. This paper presents a numerical simulation using Flow-3D software to calculate the maximum sediment scour depth and investigate the mechanism around the groups of three cylinders in a tandem arrangement. A validation using the experimental study was carried out to confirm the reliability of the present numerical model. By using the Van Rijn transport rate equation and RNG k-ε turbulence model, the results of time evolution of scour depth and bed elevation contour show good agreement with the experimental study. The numerical simulation of three cylinders in a tandem arrangement were conducted with pile spacing ratios, G/D of 2 and 3. The local scour is affected by the horseshoe vortex from the downflow driven by the downward pressure gradient and rotates in front of the pile and the high bed shear stress, triggered by flow acceleration. The deepest maximum local scour depth is always obtained by the front pile as a shield pile, followed by the piles behind. The trend of the maximum local scour depth in a tandem arrangement is in accordance with the experimental studies and has a better agreement than previous numerical studies with the same model setup. This means that the numerical model used to simulate pile groups is accurate and capable of calculating the depth of sediment scour.

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Section: Van Rijn Equation [53]mentioning

confidence: 98%

Numerical Simulation of Local Scour around Three Cylindrical Piles in a Tandem Arrangement

Tang

Puspasari

2021

Water

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“…This work investigated the scour around the pipelines under wave-current conditions. Omara et al [80] simulated the scour processes, both hydrodynamically and morphologically, around vertical and inclined piers in a new version of FLOW-3D that estimates the motion of sediment transport (suspended, settling, entrainment, and bed load). Tofany et al [71,72] studied the effects of breakwater steepness and wave overtopping on the scouring process in front of impermeable and vertical breakwaters.…”

Section: Applicability Of the Simple Approachmentioning

confidence: 99%

Advances in Numerical Reynolds-Averaged Navier–Stokes Modelling of Wave-Structure-Seabed Interactions and Scour

Díaz-Carrasco

Croquer

Tamimi

et al. 2021

JMSE

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This review paper presents the recent advances in the numerical modelling of wave–structure–seabed interactions. The processes that are involved in wave–structure interactions, which leads to sediment transport and scour effects, are summarized. Subsequently, the three most common approaches for modelling sediment transport that is induced by wave–structure interactions are described. The applicability of each numerical approach is also included with a summary of the most recent studies. These approaches are based on the Reynolds-Averaged Navier–Stokes (RANS) equations for the fluid phase, and mostly differ in how they tackle the seabed response. Finally, future prospects of research are discussed.

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“…where u p is the main flow velocity at point p, k is von Kàrmàn's constant (0.418), u* is the shear velocity related to the bottom shear stress (τ = ρu* 2 ), E is Young's modulus, ρ is the fluid density, c µ is the constant, kp is the turbulent kinetic energy at point p, z p is the distance from point p to the wall, and ∆B is the roughness function [42]. In this study, the parameters selected for sediment scour, obtained after calibration of many runs, were the critical Shields number (θ cr ) of 0.03 and the bed load coefficient (C b ) of 0.5…”

Section: Sediment Scour Modelmentioning

confidence: 99%

Investigation of Local Scouring around Hydrodynamic and Circular Pile Groups under the Influence of River Material Harvesting Pits

Daneshfaraz

Ghaderi

Sattariyan

et al. 2021

Water

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Mining activities can endanger the stability of hydraulic structures. Numerical modeling of local scouring around hydrodynamic and circular bridge pile groups, due to the action of clear water conditions via non-cohesive sediment, was performed using a computational fluid dynamics (CFD) model, a large eddy simulation (LES) turbulence model, and a van Rijn sedimentary model with FLOW-3D software. The pile groups were positioned upstream and downstream of a sand mining pit. The results showed that the scour depth around the downstream pile group was greater than that of the upstream one. Using hydrodynamic piers reduced the scour depth upstream of all piers and the material harvesting pit. The maximum reduction in scour depth was observed in front of the fifth pier, with a 29% reduction in scour depth. Additionally, for all models, as the material harvesting pit was moved downstream, the downstream turbulence was enhanced and stronger flow reversal and horseshoe vortices were detected in from of the downstream pile group. The flow patterns around the pile group showed that the presence of hydrodynamic piers in the upstream pile group leads to a decrease in the maximum flow velocity, whereas, when such piers were positioned in the downstream pile group, the velocity increases.

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Hydromorphological Numerical Model of the Local Scour Process Around Bridge Piers

Cited by 26 publications

References 43 publications

Numerical Simulation of Local Scour around Three Cylindrical Piles in a Tandem Arrangement

Numerical Simulation of Local Scour around Three Cylindrical Piles in a Tandem Arrangement

Advances in Numerical Reynolds-Averaged Navier–Stokes Modelling of Wave-Structure-Seabed Interactions and Scour

Investigation of Local Scouring around Hydrodynamic and Circular Pile Groups under the Influence of River Material Harvesting Pits

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