Extreme wave groups in a wave flume: Controlled generation and breaking onset

Buldakov, Eugeny; Stagonas, Dimitris; Simons, Richard R.

doi:10.1016/j.coastaleng.2017.08.003

Cited by 40 publications

(31 citation statements)

References 19 publications

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“…Δt (Δr) min (13) where g is the acceleration due to gravity, Δt is the time step, and (Δr) min is the minimal distance between adjacent nodes. Free surface elevation is recorded at x t applying cubic interpolation between neighboring nodes.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

“…However, their study demonstrates a noticeable discrepancy between the theoretical and the measured surface elevations. Buldakov et al [13] improved the iterative wave generation method by application of the harmonics separation technique for linearization of the amplitude spectrum. They showed that experimental adjustment of the linear part of the spectrum only considerably improves the generation accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Application of Boundary Element Method for Determination of the Wavemaker Driving Signal

Khait

Shemer

2019

Journal of Offshore Mechanics and Arctic Engineering

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A method for the generation of steep nonlinear broad-banded wave trains having an arbitrary prescribed shape is developed. It is shown that the second-order contributions to the velocity field are negligible in deep water, while the second-order bound components of the surface elevation are significant. This fact allows improvement of an iterative method of the wavemaker driving signal adjustment that increases the accuracy of excitation of wave train with the prescribed free waves’ spectrum. The decomposition of the complex amplitude spectrum of the surface elevation into free and bound components is based on the approach adopted in the derivation of the Zakharov model. The iterative adjustment of the driving signal is carried out using the numerical wave tank based on the boundary element method. It is demonstrated that accurate wave train excitation is attained for different values of the wave steepness. The method allows decreasing the number of iterations needed for the driving signal adjustment. The surface elevation values measured in the laboratory wave tank agree closely with those obtained in the numerical simulations. The measured and the simulated frequency spectra are in agreement as well.

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Section: Formulation Of the Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Boundary Element Method for Determination of the Wavemaker Driving Signal

Khait

Shemer

2019

Journal of Offshore Mechanics and Arctic Engineering

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“…The wavemaker control does not account for dissipative and nonlinear effects, and the spectrum of a generated wave group differs from the input spectrum of the control system. The iterative procedure described in [26] is used to produce waves with the desired spectrum and focussed at the centre of the flume. We apply the iterations to generate a Gaussian wave group with peak frequency of f p = 1 Hz focussed at the centre of the flume with the linear focus amplitude of 2.5 cm.…”

Section: Experimental Datamentioning

confidence: 99%

“…For example, the phase shift ∆φ = π corresponds to the wavemaker input opposite to the original wave. Wave records with shifted phases can be used for their spectral decomposition and linearisation [26]. The linearised spectra of generated waves at x = 0 are shown on can be described as strongly nonlinear non-breaking waves.…”

Section: Experimental Datamentioning

confidence: 99%

Numerical models for evolution of extreme wave groups

Buldakov

Higuera²,

Stagonas

2019

Applied Ocean Research

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The paper considers the application of two numerical models to simulate the evolution of steep breaking waves. The first one is a Lagrangian wave model based on equations of motion of an inviscid fluid in Lagrangian coordinates. A method for treating spilling breaking is introduced and includes dissipative suppression of the breaker and correction of crest shape to improve the post breaking behaviour. The model is used to create a Lagrangian numerical wave tank, to reproduce experimental results of wave group evolution. The same set of experiments is modelled using a novel VoF numerical wave tank created using OpenFOAM. Lagrangian numerical results are validated against experiments and VoF computations and good agreement is demonstrated. Differences are observed only for a small region around the breaking crest.

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“…Deng, et al [10] studied freak wave forces acting on vertical cylinders by generating freak waves in a numerical wave flume based on dispersive focusing and amplitude-phase iteration. Moreover, breaking wave forces on vertical cylinders were investigated [11] by means of deterministic breaking focused waves [12]. Similar to vertical cylinders, focused wave action on horizontal cylinders was investigated with a similar approach [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Performance of Submerged Plates During Focused Waves

Fang

Yang

Guo

2019

JMSE

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Submerged horizontal plates are widely employed in research of wave structure interaction as a simplification of coastal and ocean engineering structures. The hydrodynamic performance of submerged horizontal plates under focused waves has been seldom reported. Based on potential flow theory, this paper presents a general solution of the hydrodynamic pressure and wave forces exerted on submerged plates by a focused wave group. An existing experiment and two limiting cases are used to validate the accuracy of the present analytical model. With the validated model, the effect of wave properties and the configuration of the wave structure system on the hydrodynamic performance of submerged plates are investigated. It is found that the hydrodynamic performance of submerged horizontal plates varies with incident focused wave with different peak frequencies. The structural breadth significantly changes the hydrodynamic performance while the structural height has little influence. This paper shows the usefulness of potential flow theory for the preliminary calculation of wave loads on coastal and ocean engineering structures generated by focused waves.

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Extreme wave groups in a wave flume: Controlled generation and breaking onset

Cited by 40 publications

References 19 publications

Application of Boundary Element Method for Determination of the Wavemaker Driving Signal

Application of Boundary Element Method for Determination of the Wavemaker Driving Signal

Numerical models for evolution of extreme wave groups

Hydrodynamic Performance of Submerged Plates During Focused Waves

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