Assessment of Scour on Bridge Foundations by Means of in Situ Erosion Evaluation Probe

Kayser, Mohammad; Gabr, M. A.

doi:10.3141/2335-08

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…Flow-3D is a widely-known computational code, and in the recent past several authors have performed scientific works directed to its validation. Among others, Kocaman et al [41], Cho [42], Jin and Meng [43], Kim et al [44], and Kayser and Gabr [45] have validated the Flow-3D solver in steady and unsteady problems involving cylinders and free surfaces, always obtaining rather satisfactory results. Though, in the present context, the issue of validation is in some way subtle.…”

Section: Validation Of the Navier-stokes Solvermentioning

confidence: 99%

Numerical Simulations of Wave-Induced Flow Fields around Large-Diameter Surface-Piercing Vertical Circular Cylinder

Alfonsi

2015

Computation

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A computational analysis is performed on the diffraction of water waves induced by large-diameter, surface-piercing, vertical circular cylinder. With reference to linear-wave cases, the phenomenon is preliminarly considered in terms of velocity potential, a simplified theoretical framework in which both hypotheses of inviscid fluid and irrotational flow are incorporated. Then, and as a first-approximation analysis, the Euler equations in primitive variables are considered (a framework in which the fluid is still handled as inviscid, but the field can be rotational). Finally, the real-fluid behavior is analyzed, by numerically integrating the full Navier-Stokes equations (viscous fluid and rotational field) in their velocity-pressure formulation, by following the approach of the Direct Numerical Simulation (DNS, no models are used for the fluctuating portion of the velocity field). For further investigation of the flow fields, the swirling-strength criterion for flow-structure extraction, and the Karhunen-Loève (KL) decomposition technique for the extraction of the most energetic flow modes respectively, are applied to the computed fields. It is found that remarkable differences exist between the wave-induced fields, as derived within the different computing frameworks tested.

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Section: Validation Of the Navier-stokes Solvermentioning

confidence: 99%

Numerical Simulations of Wave-Induced Flow Fields around Large-Diameter Surface-Piercing Vertical Circular Cylinder

Alfonsi

2015

Computation

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“…This shows that scour is one of the most common potential causes of bridge pile foundation failure which causes loss of life, economic and environmental impacts. Therefore, monitoring and assessment of the scour depth around bridge pile foundation is necessary during the design [20], operation and maintenance of hydraulic structures [21]. One way to avoid serious damage is to monitor local scour around the bridge pile foundation [22] and to ensure the safety and stability of the structure, thereby preventing the loss of life and financial loss.…”

Section: Introductionmentioning

confidence: 99%

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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“…This computational code solves the flow momentum equations using the finite-volumes, and has been satisfactorily validated by several authors in different flow cases [30][31][32][33][34].…”

Section: Calculationsmentioning

confidence: 99%

Recent Results from Analysis of Flow Structures and Energy Modes Induced by Viscous Wave around a Surface‐Piercing Cylinder

Alfonsi

Lauria

Primavera

2017

Mathematical Problems in Engineering

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Due to its relevance in ocean engineering, the subject of the flow field generated by water waves around a vertical circular cylinder piercing the free surface has recently started to be considered by several research groups. In particular, we studied this problem starting from the velocity-potential framework, then the implementation of the numerical solution of the Euler equations in their velocity-pressure formulation, and finally the performance of the integration of the Navier-Stokes equations in primitive variables. We also developed and applied methods of extraction of the flow coherent structures and most energetic modes. In this work, we present some new results of our research directed, in particular, toward the clarification of the main nonintuitive character of the phenomenon of interaction between a wave and a surface-piercing cylinder, namely, the fact that the wave exerts its maximum force and exhibits its maximum run-up on the cylindrical obstacle at different instants. The understanding of this phenomenon becomes of crucial importance in the perspective of governing the entity of the wave run-up on the obstacle by means of wave-flow-control techniques.

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Assessment of Scour on Bridge Foundations by Means of in Situ Erosion Evaluation Probe

Cited by 8 publications

References 20 publications

Numerical Simulations of Wave-Induced Flow Fields around Large-Diameter Surface-Piercing Vertical Circular Cylinder

Numerical Simulations of Wave-Induced Flow Fields around Large-Diameter Surface-Piercing Vertical Circular Cylinder

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

Recent Results from Analysis of Flow Structures and Energy Modes Induced by Viscous Wave around a Surface‐Piercing Cylinder

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