A feasibility study of reducing scour around monopile foundation using a tidal current turbine

Yang, Bo; Wei, Kexiang; Yang, Wu; Li, Tieying; Qin, Bo

doi:10.1016/j.oceaneng.2020.108396

Cited by 23 publications

(8 citation statements)

References 26 publications

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“…Additionally, a phenomenon different from what has been found in previous re search is observed in the results shown in Figures 4 and 5. In previous studies [25], the deepest scour pits were often found appearing on the two sides of the monopile where horseshoe vortices occurred. However, Figures 4 and 5 illustrate that, regardless of the experimental conditions, the deepest scour pit always emerges in front of the monopile Figure 5 indicates that the application of pile vibration also exerts a great impact on the morphology of the scour pits.…”

Section: Impact Of Pile Vibration Direction On Scourmentioning

confidence: 76%

“…The sand in the sand pool was standard quartz sand, characterized by a D50 of 0.64 mm. As carried out in [25], carefully screening and cleaning the quartz sand in the pool was essential to ensure the reliability of the study.…”

Section: Methodsmentioning

confidence: 99%

“…This configuration mirrors a common OWT deployment scenario, aligned with prevailing practices within the current offshore wind industry. In addition, adhering to the guidelines outlined in [25] regarding the maximum permissible top deflection of the wind turbine tower, the utmost admissible deflection for the pipe at the shaker position (located at 1.3 m above the flume floor) can be up to 16 mm. Therefore, two pipe vibration amplitudes, 5 mm and 10 mm, were taken into account during testing.…”

Section: Testing Matrixmentioning

confidence: 99%

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A Study on the Scour Surrounding the Fixed Foundation of an Offshore Wind Turbine under Complex Waves, Tidal Currents, and Pile Vibration Conditions

Qin,

Qu,

Yang

et al. 2024

Energies

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Scouring around the fixed foundations of offshore wind turbines (OWTs) remains a pressing concern within the offshore wind industry, significantly jeopardizing OWT safety. Despite previous efforts, the current understanding of this phenomenon remains incomplete, as various factors related to offshore wind farms and OWT operations can exert intricate influences. To further explore this matter, this paper undertakes a new study to further understand the interplay between monopile vibrations, tidal currents, and sea waves, elucidating their combined impact on scour surrounding an OWT’s foundation. It was found that, besides pile vibration amplitude and frequency, the pile vibration direction can also notably influence the scour around the monopile. Specifically, the most pronounced scour mostly transpires when the monopile undergoes vibrations along the 135° direction relative to the inflow direction. The mildest scour mostly occurs when the pile vibrates along the 90° direction. Additionally, this study reveals that different types of waves, indicated by the ratio of water depth, H, to wavelength, L, also engender varying scour around the monopile. The influence of waves on scour increases with the decrease in the H/L ratio, implying that OWT foundations are more threatened by shallow water waves than by deep water waves.

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Section: Impact Of Pile Vibration Direction On Scourmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Section: Testing Matrixmentioning

confidence: 99%

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A Study on the Scour Surrounding the Fixed Foundation of an Offshore Wind Turbine under Complex Waves, Tidal Currents, and Pile Vibration Conditions

Qin,

Qu,

Yang

et al. 2024

Energies

Self Cite

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“…By using an approach based on CFD, it is possible to produce an accurate and cost-effective prediction model for scour on a large spatial scale without the complexities of in situ modelling. For example, Yang et al, [19] utilized the commercial CFD software ANSYS Fluent in order to determine the effectiveness of a submerged tidal current turbine (TCT) for scour mitigation and extra green energy production. CFD enabled the identification of a need for the correct positioning of the TCT at the base of the monopile for optimum performance.…”

Section: Introductionmentioning

confidence: 99%

Understanding Sediment Dynamics at a Shipwreck Site Using CFD Modelling

et al. 2022

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Shipwrecks are important cultural heritage sites offshore. In many instances, given their often long-term emplacement on the seafloor, they offer natural laboratories to study complex interactions between human-induced obstacles and seabed dynamics. Such interactions and induced sediment mobility also pose significant threats to offshore engineering infrastructure, such as turbine monopile foundations. Traditional methods can struggle to capture the nuance of these processes, with real-world surveys measuring effects only after installation, and laboratory models suffering from scale-down inaccuracies. Computational fluid dynamics (CFD) modelling offers an effective means of investigating the effects of obstacles on seabed dynamics, and by using shipwrecks as proxies for infrastructure, it can utilize long-term datasets to verify its predictions. In this study, high-resolution temporal bathymetric data were used in, and to verify, CFD modelling to investigate the interactions between hydro- and sediment dynamics at a shipwreck site in a tidally dominated wreck site. From this comparison, simulations of bed shear stress and scalar transport correlate well with known areas of erosion and deposition, serving as a basis for future scour prediction studies and creating effective tools in offshore renewable infrastructure planning and de-risking.

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“…Such a scour protection layer is mostly built with riprap, and can also be installed using concrete mattress and geotextile sand container [2,3]. Alternatively, flow-altering countermeasures, such as integrated tidal current turbine and anti-scour collar, are also promising engineering solutions for scour protection [4][5][6]. With the rise of new generation monopile OWTs, reducing the engineering cost and enhancing the functionality of the scour protection become significant issues.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Measurement and Model Effects in Monopile Foundation Scour Protection Experiments

Vos

Chavez

et al. 2021

JMSE

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The present work introduces an analysis of the measurement and model effects that exist in monopile scour protection experiments with repeated small scale tests. The damage erosion is calculated using the three dimensional global damage number S3D and subarea damage number S3D,i. Results show that the standard deviation of the global damage number σ(S3D)=0.257 and is approximately 20% of the mean S3D, and the standard deviation of the subarea damage number σ(S3D,i)=0.42 which can be up to 33% of the mean S3D. The irreproducible maximum wave height, chaotic flow field and non-repeatable armour layer construction are regarded as the main reasons for the occurrence of strong model effects. The measurement effects are limited to σ(S3D)=0.039 and σ(S3D,i)=0.083, which are minor compared to the model effects.

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A feasibility study of reducing scour around monopile foundation using a tidal current turbine

Cited by 23 publications

References 26 publications

A Study on the Scour Surrounding the Fixed Foundation of an Offshore Wind Turbine under Complex Waves, Tidal Currents, and Pile Vibration Conditions

A Study on the Scour Surrounding the Fixed Foundation of an Offshore Wind Turbine under Complex Waves, Tidal Currents, and Pile Vibration Conditions

Understanding Sediment Dynamics at a Shipwreck Site Using CFD Modelling

Quantification of Measurement and Model Effects in Monopile Foundation Scour Protection Experiments

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