Three-dimensional Computational Fluid Dynamics modelling of scour around a single pile due to combined action of the waves and current using Level-Set method

Gautam, Shekhar; Dutta, Debasish; Bihs, Hans; Afzal, Mohammad Saud

doi:10.1016/j.coastaleng.2021.104002

Cited by 40 publications

(16 citation statements)

References 58 publications

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“…The calculation process of Sumer method is simple but the important parameter of KC number is hard to measure accurately in actual engineering. This method purposed that no horseshoe vortex develops for KC < 6 in waves alone, however, previous studies [6] and a lot of experiments have shown that the scour depth due to waves combined with strong currents varies significantly [37]. Therefore, it also cannot effectively predict the maximum equilibrium scour depths in engineering design.…”

Section: Discussionmentioning

confidence: 99%

Experimental Study on Local Scour Depth around Monopile Foundation in Combined Waves and Current

Zhang

Shen

et al. 2021

Sustainability

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Local scour is one of the key factors that cause the collapse of structures. To avoid structure failures and economic losses in water, it is usually essential to predict the equilibrium scour depth of the foundation. In this study, several design models which were presented to predict the equilibrium scour depth either under steady clear water conditions and combined waves and current conditions were recommended. These models from China, the United States and Norway were analyzed and compared through experiments. Moreover, flume tests for monopile foundation embedded in sand under different flow conditions were carried out to observe the process and gauge the maximum depth around the pile. Based on this study, for predicting the equilibrium scour depth around bridge piers, the computational results of three design methods are all conservative, as expected. For the foundation of offshore structures in marine environment, most of the predicted scour depths by design methods are different from field data; in particular, the mean relative error with these design methods proposed may reach up to 966.5%, which may lead to underestimation of the problem, overdesign and consequently high construction cost. To further improve the ability of the scour prediction in a marine environment, data from flume tests and some field data from a previous study were used to derive the major factors of scour. Based on the dimensional analysis method, a new model to estimate the equilibrium scour depth induced by either current or waves is proposed. The mean relative error of the new formula is 49.1%, and it gives more accurate scour depth predictions than the existing methods.

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Section: Discussionmentioning

confidence: 99%

Experimental Study on Local Scour Depth around Monopile Foundation in Combined Waves and Current

Zhang

Shen

et al. 2021

Sustainability

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“…In the past decades, many experimental and theoretical studies have been conducted on the scour phenomenon around piles under various conditions. They include (1) the scour mechanism due to diverse vortex systems (Sumer et al, 1992;Sumer and Fredsøe, 2001;Roulund et al, 2005;Jenkins et al, 2007;Baykal et al, 2015), (2) the scour development process over time and prediction of the scour balance time (McGovern et al, 2014;Ma et al, 2018;Schendel et al, 2018;Lu et al, 2022), and (3) the main factors affecting the scour results and characteristics (Zhao et al, 2010;Yao et al, 2018;Gautam et al, 2021;Yang Q. et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of offshore wind power pile foundation scour with different arrangements of artificial reefs

et al. 2023

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The industrial integration of offshore wind power and marine ranches has been actively explored and developed in many countries. This emerging industrial synergy can significantly improve the ecological friendliness of offshore wind power and contribute to the development of the marine economy in the region. This industrial synergy is an important development direction for future offshore engineering. Artificial reefs (ARs) are critical components of marine ranches and are widely placed around offshore wind foundations (OWFs). The ARs can block the water flow and form a complex wake region behind it, which changes the original turbulence structure and reduces scour around the OWF. Therefore, determining the arrangement of ARs for scour protection around an OWF is of great engineering significance. In this study, a three-dimensional numerical model is established using a prototype of the first offshore wind power-marine ranch demonstration project in China. The turbulent change and sediment movement between the OWF and ARs are solved using the Reynolds-averaged Navier-Stokes (RANS) and sediment transport equations. Moreover, the variations in the maximum scour depth and scour volume around the OWF at different arrangements of ARs are explored. The results demonstrate that the arrangement of ARs weakens the horseshoe vortices in front of the OWF and destroys the vortex shedding behind the OWF, thereby producing a beneficial scour protection effect. Various arrangements of ARs have different effects on scour results around the OWF. Increasing the height of the AR could significantly reduce the scour results around the OWF and play an effective role in scour protection, followed by the tandem arrangement of ARs, whereas the parallel arrangement of ARs will produce negative scour effects. This study will serve a vital guiding role in the arrangement of ARs and practical significance for scouring protection around the OWF.

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“…To the best of our knowledge, studies considering the combined effects of wind, waves, and currents on complex piers have not been reported so far. With the advancements in modern numerical simulation methods, the CFD (computational fluid dynamics)-based flow model incorporating free surface capturing and bed sediment models has been employed to study pier/pile scour in wave conditions (e.g., [14][15][16][17][18][19][20]). To enhance the conciseness of the paper and mitigate redundancy, for more details on the progress of CFD modelling of scour for marine structures, readers are referred to the reviews by Lai et al (2022) [21] and Zhao (2022) [22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Flow and Scour around Complex Bridge Piers in Wind–Wave–Current Conditions

Yang,

Li,

Zou

et al. 2023

JMSE

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A sea-crossing bridge is typically constructed in a marine environment with complex piers, and is susceptible to severe scour at the foundation. This study presents a numerical investigation on flow and scour around a complex pier, specifically focusing on a real-world sea-crossing bridge in China. A comprehensive CFD model incorporating hydrodynamic, free surface, sediment transport, and morphological models is employed for numerical modeling. Additionally, a wind shear stress model is considered to accurately simulate wind generation. The validation of the CFD model is achieved through comparison with experimental data of scour around a cylinder, demonstrating its capability to accurately replicate scour morphology and the temporal evolution of scour depth. Subsequently, the validated model is utilized for full-scale simulation of scour around the complex bridge pier under different wind, wave, and current conditions. The results indicate that compared to single piers with uniform cross-sectional shapes, flow patterns around complex piers are much more complicated. Scour predominantly occurs around the first row of group piles, while downstream piles experience less scour due to the sheltering effect from upstream piles. Furthermore, it becomes evident that the current exerts greater influence on pier scour than waves and wind, while the latter two factors primarily influence the superstructure of the bridge.

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Three-dimensional Computational Fluid Dynamics modelling of scour around a single pile due to combined action of the waves and current using Level-Set method

Cited by 40 publications

References 58 publications

Experimental Study on Local Scour Depth around Monopile Foundation in Combined Waves and Current

Experimental Study on Local Scour Depth around Monopile Foundation in Combined Waves and Current

Numerical simulation of offshore wind power pile foundation scour with different arrangements of artificial reefs

Numerical Investigation of Flow and Scour around Complex Bridge Piers in Wind–Wave–Current Conditions

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