Numerical investigation of the local scour around a coconut tree root foundation under wave-current joint actions

Deng, Xu Lei; He, Sizhong; Cao, Zhouhong

doi:10.1016/j.oceaneng.2022.110563

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…In some numerical studies in nearly clear water scour conditions, only the bed load terms in Equations ( 25) and ( 26) are considered, and suspended load is neglected [40,55,[70][71][72] because the contribution of the suspended load is negligibly small. Some numerical studies used the sediment transport model embedded in commercial software, such as ANSYS Fluent [73,74] or Flow3D [52,53,[75][76][77][78][79][80], or in open-source software OpenFoam [58,81] to simulate local scour. Omara, Elsayed [82] conducted a detailed numerical study to examine the accuracy of Flow3D in the simulation of scour around bridge piers and demonstrated the accuracy of the hydromorphological model.…”

Section: Scour Predictionmentioning

confidence: 99%

A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures

Zhao

2022

JMSE

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This paper reviews the recent development of numerical modelling of local scour around hydraulic and marine structures. The numerical models for simulating local scour are classified into five categories: sediment transport rate models, two-phase models, CFD-DEM models, equilibrium scour models and depth-averaged models. The sediment transport rate models are the most popularly used models because of their high calculation speed and availability of empirical formulae for predicting sediment transport rates. Two-phase models were developed to simulate sediment transport in the format of sheet flow under strong current velocity or strong turbulence. The CFD-DEM model simulates the motion of every individual sediment particle. Its speed is the slowest, but it provides the opportunity to understand fundamental mechanisms of flow–particle interaction and particle–particle interaction using small-scale simulations. Equilibrium scour models predict the final scour profile at the equilibrium stage but cannot predict scour history. The depth-averaged models that were developed early are not recommended for local scour problems because they are not able to predict three-dimensional features around structures. Although many numerical models have been developed and many studies have been conducted to investigate local scour, some challenging problems remain to be solved, for example, the effects from scaling and sediment gradation. In addition, people’s understanding of local scour of cohesive sand is still very shallow, and more experimental and numerical research in this area is needed.

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Section: Scour Predictionmentioning

confidence: 99%

A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures

Zhao

2022

JMSE

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“…Active scour protection involves the addition of structures at the bottom of the OWF, such as collars and anchor branches (Pandey et al, 2020;Yu et al, 2020;Zhang et al, 2021). These methods can change the flow pattern at the bottom of the OWF and strengthen the ability to protect the seabed, thereby further reducing sediment transport at the junction (Yang et al, 2020;Yang F. et al, 2021;Deng et al, 2022). Active scour protection structures, such as skirted mudmat foundations, multi-bucket jacket foundations, composite bucket foundations, and skirted caisson foundations, have also been designed to solve scour damage under various complex conditions (Yu et al, 2019;Yao et al, 2020;Lian et al, 2022;Wei 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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Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

Wang

Cheng

2023

Front. Struct. Civ. Eng.

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Numerical investigation of the local scour around a coconut tree root foundation under wave-current joint actions

Cited by 5 publications

References 23 publications

A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures

A Review on Recent Development of Numerical Modelling of Local Scour around Hydraulic and Marine Structures

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

Numerical modeling of current-induced scour around multi-wall foundation using large-eddy simulation

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