Numerical simulation of scour and backfilling processes around a circular pile in waves

Baykal, Cüneyt; Sumer, B. Mutlu; Fuhrman, David R.; Jacobsen, Niels Gjøl; Fredsøe, Jørgen

doi:10.1016/j.coastaleng.2017.01.004

Cited by 89 publications

(53 citation statements)

References 59 publications

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“…In the wave test simulated in this research, 100 cells were used in the vertical for cases C01 to C08, and 200 cells for cases C09 and C10. If these vertical resolutions are compared with the configuration adopted by Bihs et al (2016) and Baykal et al (2017), a better description of the hydrodynamics induced by waves around cylindrical piles can be expected from our numerical simulation.…”

Section: Discussionmentioning

confidence: 96%

“…According to their results, a grid with 40 cells in the vertical axis is enough to describe the waves and the hydrodynamics induced by it. Baykal et al (2017), as a continuation of the Roulund et al (2005) study, numerically studied the scour and the backfilling processes around a mono pile. The flow is defined using a solution of RANS equations with K − ω as a turbulent closure model.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical simulation of scour around circular piles due to unsteady currents and oscillatory flows

Quezada

Tamburrino

Niño

2018

Engineering Applications of Computational Fluid Mechanics

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Numerical modeling of pile scour is performed due to the action of unsteady currents and oscillatory flow greens, using 3D Reynolds averaged Navier-Stokes (RANS) equations for the hydrodynamic description and the Exner equation for the morphological evolution of the bed, all of them incorporated into the computational fluid dynamics tool called REEF3D. As a first task, the numerical model was calibrated by comparing its results of scour against two sets of data, the first one obtained from numerical simulations and the second one from experimental tests. From these results it was possible to define the closure model of turbulence and a relaxation coefficient on the bed load equation necessary to increase the mobility of the sediments in the vicinity of the pile. Once the model was calibrated, a set of numerical simulations of pile scour under unsteady flow and oscillatory flow was performed using different hydrographs and wave conditions. There is a strong agreement between the simulated data and the experimental data reported by other authors for unsteady flow. In the case of scour associated with oscillatory flow, the numerical results showed the same statistical behavior as the experimental data previously published by others. When the numerical results are analyzed according to the Keulegan-Carpenter number, they represent the scour phenomenon in the same order of magnitude of the experiments. A conclusion of the study is the necessity to improve the sediment transport description, in order to avoid the use of a dedicated relaxation coefficient that reduces the threshold condition of the incipient transport.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Numerical simulation of scour around circular piles due to unsteady currents and oscillatory flows

Quezada

Tamburrino

Niño

2018

Engineering Applications of Computational Fluid Mechanics

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“…where U wm is the maximum velocity of the undisturbed wave-induced oscillatory flow at the sea bottom above the wave boundary layer, D is the pile diameter, and T is the wave period. In contrast to the controlling role of the lee-wake vortices in eroding the sediment grains around a cylinder, the HSV would be less significant because the wave boundary layer is usually thin (see [29,30]), especially for relatively small KC numbers [26]. Regarding monopile foundations for OWTs, the corresponding value of KC number is usually low due to the large diameter [31].…”

Section: Local Scour Around a Monopile 21 General Description And Scmentioning

confidence: 99%

Local Scour around a Monopile Foundation for Offshore Wind Turbines and Scour Effects on Structural Responses

Qi¹,

Gao²

2020

Geotechnical Engineering - Advances in Soil Mechanics and Foundation Engineering

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Monopile is the most commonly used foundation type for offshore wind turbines. The local scour at a monopile foundation generated by the incoming shear flow has significant influence on both quasi-static lateral responses and dynamic responses of the monopile. This chapter focuses particularly on characterizing the local scour in both spatial and temporal scales and revealing the scour mechanisms associated with the flow field around a monopile. The predicting methods for the equilibrium scour depth and the time scale of scour are detailed under various representative flow conditions in the marine environment. The scale effect while extrapolating the results of model tests to prototype conditions is highlighted. The local scour imposes significant influence not only on the deformation and stiffness of the monopile foundation, but also on the natural frequency and fatigue life of the structure system. Monopiles with diameters up to 10 m have become a feasible option as the industry is currently advancing into deeper waters. More meticulous considerations for monopile design associated with the scour depth prediction and evaluation of scour effects are still in need to efficiently minimize the cost while remaining safety simultaneously.

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“…Baykal et al [42] presented a numerical model for scour around a pier exposed to waves. They used the experimental data of Sumer et al [26,27] and simulated their model with a k-ω turbulence closure.…”

Section: Scour Depthmentioning

confidence: 99%

Scour around Piers under Waves: Current Status of Research and Its Future Prospect

Gazi

Afzal

Dey

2019

Water

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In this review article, the current status of research on pier scour under waves is presented. This includes a summary of different bridge failure events due to scour, scour mechanism, scour depth predictors under waves, influence of pier shape on scour depth formation, shape of scour hole around piers, and many others. Further, this article describes the scour process, development of scour depth predictors, and the complexity involved in the scour related calculations. Finally, the future scope of research is delineated.

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Numerical simulation of scour and backfilling processes around a circular pile in waves

Cited by 89 publications

References 59 publications

Numerical simulation of scour around circular piles due to unsteady currents and oscillatory flows

Numerical simulation of scour around circular piles due to unsteady currents and oscillatory flows

Local Scour around a Monopile Foundation for Offshore Wind Turbines and Scour Effects on Structural Responses

Scour around Piers under Waves: Current Status of Research and Its Future Prospect

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