Validation of Hydrodynamic Loads on a Large-Diameter Monopile in Regular Waves

Dadmarzi, Fatemeh Hoseini; Thys, Maxime; Bachynski, Erin Elizabeth

doi:10.1115/omae2019-95929

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…The model tests for the documentation of wave kinematics and for the measurement of wave loads on rigid models were carried out at Froude scale of 1:50 [7,8]. The tank is equipped with a wave maker and a towing carriage.…”

Section: Experimental Datamentioning

confidence: 99%

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Validation of Numerical Wave Tank Simulations Using Reef3d With Jonswap Spectra in Intermediate Water Depth

Pákozdi¹,

Fouques²,

Thys³

et al. 2021

Preprint

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As offshore wind turbines increase in size and output, the support structures are also growing. More sophisticated assessment of the hydrodynamic loads is needed, particularly for the ultimate limit state design. For higher-order phenomena related to rare steep wave events such as ringing, a better understanding of the stochastic loads is needed. As an innovative step forward to reduce the cost of extensive model tests with irregular waves, a larger number of investigations can be carried out using highperformance high-fidelity numerical simulations after an initial stochastic validation with model test data.In this paper, the open-source hydrodynamic model REEF3D::FNPF (Fully Nonlinear Potential Flow) is used to carry out three-hour long simulations with the JONSWAP spectrum in intermediate water depth conditions. Statistical properties of the free surface elevation in the numerical wave tank are validated using the available data from model tests carried out at SINTEF Ocean/NTNU. The spectral shape, significant wave height, peak period, skewness, kurtosis, and wave crest height statistics are compared. The results are analyzed and it is found * Address all correspondence to this author. that the numerical model provides reasonably good agreement with the model test data.

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Section: Experimental Datamentioning

confidence: 99%

“…In the present work, a new model test is chosen for validation. This model test was performed in June-July 2018 in the small wave tank at SINTEF Ocean [7,8] as part of the research project WAS-XL [9]. The purpose of the test was documentation of wave kinematics and measurement of wave loads on rigid models.…”

Section: Introductionmentioning

confidence: 99%

Validation of Numerical Wave Tank Simulations Using Reef3d With Jonswap Spectra in Intermediate Water Depth

Pákozdi¹,

Fouques²,

Thys³

et al. 2021

Preprint

Self Cite

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show abstract

“…The experiments were carried out in SINTEF/NTNU's small towing tank [17] and [18,19]. Two types of wave makers are available: a single flap hinged wave maker and a piston type wave maker.…”

Section: Experimental Datamentioning

confidence: 99%

Representation of Breaking Wave Kinematics in the Fully Nonlinear Potential Flow Model REEF3D::FNPF

Pákozdi

Kamath

Wang

et al. 2020

Volume 8: CFD and FSI

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Robust simulations over three-hours are essential to represent a stationary sea state and derive wave statistics and structural response of marine structures in a reliable manner. This means that the numerical model used for the simulation of the sea state should be computationally efficient, stable and accurate. The fully nonlinear potential flow (FNPF) model solving the Laplace equations is found to be a good tool for this application. The drawback of using the FNPF model is the representation of wave breaking. Due to the assumptions of irrotational flow, it is not possible to represent an overturning free surface which occurs as a result of wave breaking. Therefore, there is a need to investigate a method to represent the effect of wave breaking in an efficient yet accurate manner. In this paper, the open-source model REEF3D::FNPF is used. The model demonstrates good robust performance and stability even in the presence of breaking waves in the domain. However, it is noticed that the free surface in the aftermath of wave breaking is slightly over predicted. This results in waves in the post-breaking region that are higher and steeper than expected after wave breaking. This difference can be avoided by incorporating techniques to correctly reduce the wave energy in the post-breaking region by the means of a reasonable damping mechanism. Breaking waves generated in the facility at SINTEF Ocean/NTNU are simulated in REEF3D::FNPF. Earlier presented results of Star-CCM+ [1] are used in the comparison. The free surface measured at several different locations in the Small towing tank are compared to the numerical results. As published earlier, the CFD model represents the model test data well. Further, the effect of wave breaking in the numerical models is investigated by comparing the numerical results from both models. The difference in the free surface representation is used to analyze the damping factor required in the FNPF model, compared to the wave kinematics represented in the CFD model. Further, REEF3D::FNPF is used to carry out three-hour long simulations with the JONSWAP spectrum in intermediate water depth conditions in order to identify the influence of the breaking model parameters on the statistical properties of the generated waves and compared against model test data.

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Validation of Hydrodynamic Loads on a Large-Diameter Monopile in Regular Waves

Cited by 2 publications

References 8 publications

Validation of Numerical Wave Tank Simulations Using Reef3d With Jonswap Spectra in Intermediate Water Depth

Validation of Numerical Wave Tank Simulations Using Reef3d With Jonswap Spectra in Intermediate Water Depth

Representation of Breaking Wave Kinematics in the Fully Nonlinear Potential Flow Model REEF3D::FNPF

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