Numerical simulation of deterministic freak wave sequences and wave-structure interaction

Gao, Ningbo; Yang, Jing; Zhao, Wenhua; Li, Xin

doi:10.1080/17445302.2015.1073864

Cited by 25 publications

(7 citation statements)

References 21 publications

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“…Moreover, the wave height, respectively by using the phase iteration (Gao et al, 2015) and amplitude-phase iteration (Deng et al, 2015) methods are 0.240 and 0.236 m, and the wave crest are 0.150 and 0.159 m, the modification results in this study are closer to the target values, by which the efficacy of the modification method can be verified.…”

Section: Numerical Simulation Of "Nyw"supporting

confidence: 57%

Numerical Simulation of Inline Forces on a Bottom-Mounted Circular Cylinder Under the Action of a Specific Freak Wave

2020

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Freak waves pose a great threat to the tension-leg platforms (TLPs) and monopile foundations of offshore wind turbines (OWTs), which necessitates comprehensive investigations on the characteristics of freak waves and the wave actions on those offshore renewable energy structures with circular cylinder. The recorded freak wave series “New Year Wave” (NYW) was numerically simulated using the Computational Fluid Dynamics methods. The compensation measure was adopted to effectively improve simulation accuracy. Under the action of the NYW, the inline forces and secondary load cycle (SLC) on a vertical-mounted cylinder, as the classic form for the TLPs and foundation of OWTs, were fully addressed. The simulation results were compared with the empirical formulations and experimental data to reveal the differences and the possible causes. The development of SLC was found to be closely related to the downstream vortex and return flow, which induces the reduction of the wall pressure and thus the inline force. The maximum inline forces vary with the cylinder position relative to the wave peak, and the simulation results reveal that the linear inline forces calculated by Morison formulation may be less than 65% of the total wave forces.

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Section: Numerical Simulation Of "Nyw"supporting

confidence: 57%

Numerical Simulation of Inline Forces on a Bottom-Mounted Circular Cylinder Under the Action of a Specific Freak Wave

2020

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“…By taking the temporal period of the Ma soliton to infinity, Peregrine introduced Peregrine breather solution in 1983, which describes the amplification of an initial infinitesimal disturbance of a plane wave where its maximum amplitude can reach three times that of the initial wave amplitude. It is also applied to investigate the wave force of the structures in different shape (Jensen 2008;Deng et al 2015;Gao et al 2015;Xiong et al 2015). The third-order nonlinear Schrödinger equation can be written as follows:…”

Section: Peregrine Breather Solutionmentioning

confidence: 99%

Fourth-order split-step pseudo-spectral method for the modified nonlinear Schrödinger equation

Yang

Tian

2016

Ships and Offshore Structures

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In the field of water waves, the modified nonlinear Schrödinger (mNLS) equation which models the wave propagation in water is numerically solved by using the split-step pseudo-spectral method. In the present paper, the fourth-order split-step pseudo-spectral method is introduced with better numerical results. The proposed method is based on a split-step method which decomposes the original equation into two parts, a linear problem and a nonlinear problem. In order to demonstrate the high accuracy and capability of the newly proposed method, a simple problem of periodic waves is presented to compare the traditional firstorder method with the fourth-order method in terms of the conservation error and computational cost. Meanwhile, another numerical experiment concerning the Peregrine breather solution of the nonlinear Schrödinger (NLS) equation is presented by using the fourth-order split-step pseudo-spectral method. It is found that the fourth-order scheme can provide higher conservative accuracy and is computationally more efficient compared with the first-order scheme.

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“…Distortional waves can be generated at specific times and spaces by using appropriate models. Zhang et al [16] and Gao et al [17] used a linear superposition model to generate freak waves. Because of the tremendous wave height, swift propagation speed, and extremely destructive characteristics of freak waves, it is important to study the safety of marine structures under the attack of freak waves.…”

Section: Introductionmentioning

confidence: 99%

Study on Slamming Pressure Characteristics of Platform under Freak Wave

Huo

Yang

Yao

et al. 2021

JMSE

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Freak waves have great peak energy, short duration, great contingency, and strong nonlinear characteristics, and can cause severe damage to ships and marine structures. In this study, numerical simulations in conjunction with experimental tests are applied to study air gap response and wave slamming loads of a semi-submersible offshore platform under a freak wave. A three-dimensional wave tank, which is created based on the computational fluid dynamics (CFD) method, is applied to study the hydrodynamic responses of a semi-submersible platform. The numerical model of the tank and offshore platform system are checked according to the experimental results. A typical freak wave is modelled in numerical wave tanks by the linear superposition method, and its significant wave height is 13.03 m. It is found that the freak wave is closely associated with the wave slamming. The appearance of the freak wave gives rise to a negative air, gap which appears on the side of the back wave surface at the bottom of the deck box, and considerable slamming pressure is generated. Furthermore, the wave run up at the junction of the column and the buoyancy tank is also seen due to the freak wave.

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Numerical simulation of deterministic freak wave sequences and wave-structure interaction

Cited by 25 publications

References 21 publications

Numerical Simulation of Inline Forces on a Bottom-Mounted Circular Cylinder Under the Action of a Specific Freak Wave

Numerical Simulation of Inline Forces on a Bottom-Mounted Circular Cylinder Under the Action of a Specific Freak Wave

Fourth-order split-step pseudo-spectral method for the modified nonlinear Schrödinger equation

Study on Slamming Pressure Characteristics of Platform under Freak Wave

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