Directional spectrum methods for deterministic waves

Pascal, Rémy; Bryden, Ian

doi:10.1016/j.oceaneng.2011.05.021

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…Therefore, the wave spectrum is expressed as a single vector of dimensions × Θ, ensuring that the same wave frequency component does not repeat itself along the spectrum. References [8] and [1] suggest uniformly distributing the directions in ascending order across the subfrequencies. This should give the maximum frequency difference between waves with the same direction.…”

Section: Single-sum Methodsmentioning

confidence: 99%

Computation of Wave Loads Under Multidirectional Sea States for Floating Offshore Wind Turbines

Duarte

Gueydon

Jonkman

et al. 2014

Volume 9B: Ocean Renewable Energy

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This paper focuses on the analysis of a floating wind turbine under multidirectional wave loading. Special attention is given to the different methods used to synthesize the multidirectional sea state. This analysis includes the double-sum and single-sum methods, as well as an equal-energy discretization of the directional spectrum. These three methods are compared in detail, including the ergodicity of the solution obtained. From the analysis, the equal-energy method proved to be the most computationally efficient while still retaining the ergodicity of the solution. This method was chosen to be implemented in the numerical code FAST. Preliminary results on the influence of these wave loads on a floating wind turbine showed significant additional roll and sway motion of the platform.

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Section: Single-sum Methodsmentioning

confidence: 99%

Computation of Wave Loads Under Multidirectional Sea States for Floating Offshore Wind Turbines

Duarte

Gueydon

Jonkman

et al. 2014

Volume 9B: Ocean Renewable Energy

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show abstract

“…Double-sum is converted into a single-sum wavemaker where each wave component has specific frequency and direction. Single summation was proposed before with variations in the distribution of wave components (Jefferys, 1987;Miles and Funke, 1989;Pascal and Bryden, 2011), and a useful schematic view was given in Pascal (2012). Based on this previous work, we rewrite the free-surface wave boundary condition :…”

Section: Corrected Single-sum Wavemakermentioning

confidence: 99%

“…A common solution is to increase the number of frequencies in the wavemaker spectrum, but this only reduces the probability of coherent interference, and is also computationally expensive. Building on previous work (Pascal and Bryden, 2011;Salatin et al, 2021), here we implement a single-sum wavemaker that is both computationally efficient and definitely devoid of coherent interference. To confirm that this is desirable in a numerical model, we validate the single-sum method and compare with the double-sum method for the first time with data from a directional wave basin experiment (Baker et al, 2023b).…”

Section: Introductionmentioning

confidence: 99%

Correction of coherent interference in wave-resolving nearshore models and validation with experimental data

Treillou,

Marchesiello,

Baker

2024

Ocean Modelling

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“…The resulting physically simulated random sea states in the curved tank are repeating complexperiodic processes, which do not require window functions to be applied in the analysis of recorded wave elevations. This has a significant advantage when it comes to measuring wave spectra for validation purposes, as it allows for more accurate spectral estimates [ 12 ].…”

Section: The Operation Of the Tankmentioning

confidence: 99%

Validation of a hydrodynamic model for a curved, multi-paddle wave tank

Gyöngy¹,

Richon²,

Bruce³

et al. 2014

Applied Ocean Research

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Obtaining a hydrodynamic model for a wave tank has many benefits, from allowing the useable test zone to be identified, to helping with the tuning of the wavemaker controllers. This paper explores a first-order, boundary element method (BEM) that has been previously proposed for modelling wave tanks, applying the method to a tank with a unique, curved geometry. In a series of experiments, the model is shown to provide a good representation of the wave profile across the tank. Inherent limitations in the method are also identified: in the case when only a single paddle is moved, significant, un-modelled second-order spurious waves are found to emerge. Moreover, the representation of the wave absorbers by a simple, partially reflecting surface does not adequately reproduce the measured spatial variation in the reflection coefficient.

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Directional spectrum methods for deterministic waves

Cited by 10 publications

References 15 publications

Computation of Wave Loads Under Multidirectional Sea States for Floating Offshore Wind Turbines

Computation of Wave Loads Under Multidirectional Sea States for Floating Offshore Wind Turbines

Correction of coherent interference in wave-resolving nearshore models and validation with experimental data

Validation of a hydrodynamic model for a curved, multi-paddle wave tank

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