Critical assessment of hydrodynamic load models for a monopile structure in finite water depth

Suja-Thauvin, Loup; Bachynski, Erin Elizabeth; Pierella, F.; Borg, Michael; Krokstad, Jørgen R; Bredmose, Henrik

doi:10.1016/j.marstruc.2020.102743

Cited by 17 publications

(10 citation statements)

References 29 publications

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“…The Rainey load model is derived on energy conservation grounds only, and does not make any assumptions on the incoming waves, except for the fact that the cylinder is slender and does not modify the wave surface, also called the wavy lid assumption. While this point force differs from the F ψ in Kristiansen and Faltinsen [17], a recent study of Suja-Thauvin et al [18] concluded that the third-harmonic content of the two terms agree for large waves.…”

Section: The Force Modelsmentioning

confidence: 76%

The DeRisk database: Extreme Design Waves for Offshore Wind Turbines

Pierella,

Lindberg,

Bredmose

et al. 2020

Preprint

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The estimation of extreme loads from waves is an essential part of the design of an offshore wind turbine. Standard design codes suggest to either use simplified methodologies based on regular waves, or to perform fully nonlinear computations. The former might not provide an accurate representation of the real extreme waves, while the latter is computationally too intensive for fast design iterations. Here, we address these limitations by using the fully nonlinear solver OceanWave3D to establish the DeRisk database, a large collected dataset of extreme waves kinematics in a two-dimensional domain. From the database, which is open and freely available, a designer can easily extract fully-nonlinear wave kinematics for a wave condition and water depth of interest by identifying a suitable computation in the database and, if needed, by Froude-scaling the kinematics.The fully nonlinear solver is first validated against the DeRisk model experiments at two different water depths, 33.0[m] and 20.0[m], and an excellent agreement is found for the analyzed cases. The experiments are used to calibrate OceanWave3D's numerical breaking filter constant, and the best agreement is found for β = 0.5. We then compare the experimental static force with predictions obtained by the DeRisk kinematics database and the Rainey force model, and with state-of-the-art industrial practices. For milder storms, we find a good agreement in the predicted extreme force between the present methodology and all of the standard methodologies. At the deep

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Section: The Force Modelsmentioning

confidence: 76%

The DeRisk database: Extreme Design Waves for Offshore Wind Turbines

Pierella,

Lindberg,

Bredmose

et al. 2020

Preprint

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show abstract

“…and Faltinsen [23], a recent study of Suja-Thauvin et al [24] concluded that the third-harmonic content of the two terms agree for large waves. No slamming model is included in the present force computations.…”

Section: The Force Modelmentioning

confidence: 90%

Generation of highly nonlinear irregular waves in a wave flume experiment: Spurious harmonics and their effect on the wave spectrum

Pierella¹,

Bredmose²,

Dixen

2021

Coastal Engineering

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“…Both of these force models include a point load at the free surface which is not included here due to its third-order magnitude. A recent study by Suja-Thauvin et al (2020) suggested that although these two point loads appear to differ by a factor of 8, their third-harmonic force for large-amplitude regular waves are remarkably close.…”

Section: Journal Pre-proofmentioning

confidence: 96%

“…First, the peak loads values are usually underpredicted due the missing higher-order corrections, and second, the nonlinear load contributions at the super and sub harmonic frequencies outside the linear spectrum are not included. Recent examples of these effects are given in Suja-Thauvin et al (2020), Pierella et al (2021) and Wang et al (2021). For design of offshore wind turbine substructures, the IEC61400-3-1 (2019) standard thus requires to take nonlinear kinematics into account for the ULS loads.…”

Section: Introductionmentioning

confidence: 99%