Numerical investigations of the round-nosed bridge pier length effects on the bed shear stress

Bouabdellah, Guemou; Seddini, Abdelali; Ghenim, Abderrahmane Nekkache

doi:10.1504/pcfd.2016.078753

Cited by 8 publications

(4 citation statements)

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“…It is also used to systematically study the effect of pier configurations on the flow and scour patterns. The configuration variables mainly include geometric scale (Huang et al 2009), cross section shape (Guemou et al 2013), stream attack angle (Tao et al 2013), and so on.…”

Section: Introductionmentioning

confidence: 99%

Streamlining of Bridge Pier as a Scour Countermeasure: A Feasibility Study

Tao

2015

Ifcee 2015

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Scour around bridge pier is known as one of the most critical causes to bridge failure. Countermeasures suggested by HEC-23 (2009) include riprap, gabions, spurs, guide banks, and so on. The principals of these countermeasures are either mechanically stabilizing the channel bed surface to prevent the development of the scour hole, or reducing the vortex intensity. Streamlining of the piers is a potentially feasible countermeasure to bridge scour by reducing the vortex strength. In this paper, Computational Fluid Dynamics (CFD) models are developed to evaluate the feasibility of streamlining as a countermeasure. Five test cases with different streamlining features are systematically analyzed and compared. It is found that the vertical profile of the pier nose and sidewalls has significant effects on the development of vortex structures around piers. Streamlined pier nose and sidewalls help reduce the downward flow in front of the piers, the vortex extent around the pier and the bed shear stress intensity. If the pier is not aligned with the incoming flow, however, the effectiveness of streamlining as a scour countermeasure may be highly compromised.

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Section: Introductionmentioning

confidence: 99%

Streamlining of Bridge Pier as a Scour Countermeasure: A Feasibility Study

Tao

2015

Ifcee 2015

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“…Furthermore, the results proved the high capability of the kepsilon turbulence of the model to captures the flow field, the vortices especially at the wake region of bridge piers [18], no vortex shedding has been captured at upstream of the pier as shown in Figure 3. Figure 4 shows the architecture of the flow at the three berths in the created model.…”

Section: Resultsmentioning

confidence: 80%

Comparing the 3D Flow Behavior Around Different Bridge Pier Shapes Using CFD-Fluent: Implications for Reducing Local Scour

Ahmed,

Ismael

2024

MMEP

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The current study deals with simulation of 3D-flow around three different types of bridge pier shapes on a flatbed surface. The main objective of this article is to explore how water flows around various types of bridge piers. In this article, the CFD-Fluent (k-epsilon) turbulence model was used to simulate the flow turbulence around untraditional piers named upstream facing aero-foiled shaped pier (US-FASP) and downstream facing aero-foiled shaped pier (DS-FASP) and were compared with the circular pier, Results from the experiments were compared to the expected flow velocity (m/s), turbulent kinetic energy (TKE), and other variables. The results of the threedimensional simulation of the water flow behavior and turbulent kinetic energy around the three various designs of bridge piers support that. The findings suggest that (DS-FASP) is the most effective sort of form to employ since it allows water to flow around it extremely smoothly, resulting in minimal obstruction of the water flow in addition to the lowest TKE. In this investigation, root mean errors were used. mean squared errors (MSE), mean absolute errors (MAE), and both the correlation coefficient (R) and the root mean square error (RMSE). The findings also demonstrated that the type of form (DS-FASP) outperformed pavements with other diverse shapes in terms of performance. From this, it was found that the turbulent kinetic energy (TKE) and longitudinal velocity (u) had mean least square errors (MSE) of 1.5E-0 and 7.6E-08, respectively, and coefficients (R 2 ) of 0.92 and 0.98. The shape of a wake vortex in a wake region is captured by the (k-epsilon) model. The k-epsilon turbulence model showed good similarities with the experimental results. The study's findings suggest that local cleaning in the vicinity of bridge piers can be scaled back in the future.

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“…Another approach is changing the flow pattern through a collar, deflectors, bed sills, sacrificial piles, or slot. The shape of the pier and the degree of scour can significantly influence the flow pattern around the pier, so square piers exhibiting downward flow and horseshoe vortex compared to circular piers [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Floating Debris on Flow Characteristics around Slotted Bridge Piers: A Numerical Simulation

Mohammad Ali Nezhadian,

Hamidifar

2023

Water

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Bridge pier scouring is a significant concern in hydraulic engineering, requiring thorough investigation under various conditions to estimate maximum scour depth and mitigate the risk of bridge failure. This study aims to conduct a numerical simulation of flow around a bridge pier with slots in the presence of floating debris, with the objective of analyzing variations in parameters such as velocity, shear stress, turbulent intensity, and turbulent kinetic energy. The FLOW−3D software package (Version 11), along with the k−ε (RNG) turbulence model, was employed for the simulation. The results indicate that the presence of a slot in the bridge pier provided a smooth pathway for the flow, resulting in a reduction in the pressure gradient and alleviating the negative impacts on the flow. This, in turn, led to a decrease in the velocity of the flow. Additionally, turbulence intensity around the pier ranges between 0 and 49, while turbulent kinetic energy varies from 0 to 0.005. The findings reveal that models without slots exhibit higher turbulence and vorticity levels, as well as greater flow separation, compared to models with slots. This disparity can be attributed to the slot’s ability to neutralize detrimental lateral and downward flows. Furthermore, the results demonstrate a gradual decrease in shear stress as the flow approaches slotted bridge piers, accompanied by a reduction in vortex intensity. These findings suggest that the accumulation of floating debris can counteract the influence of slots in reducing scour around bridge piers, necessitating thorough consideration during the design phase.

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Numerical investigations of the round-nosed bridge pier length effects on the bed shear stress

Cited by 8 publications

References 0 publications

Streamlining of Bridge Pier as a Scour Countermeasure: A Feasibility Study

Streamlining of Bridge Pier as a Scour Countermeasure: A Feasibility Study

Comparing the 3D Flow Behavior Around Different Bridge Pier Shapes Using CFD-Fluent: Implications for Reducing Local Scour

Effects of Floating Debris on Flow Characteristics around Slotted Bridge Piers: A Numerical Simulation

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