Investigation on the effects of Bragg reflection on harbor oscillations

Gao, Junliang; Ma, Xiaozhou; Dong, Guohai; Chen, Hongzhou; Liu, Qian; Zang, Jun

doi:10.1016/j.coastaleng.2021.103977

Cited by 192 publications

(71 citation statements)

References 52 publications

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“…For large volume structures, linear potential theory is recommended to calculate the diffraction and radiation forces. Computational Fluid Dynamics (CFD) approach is utilized to mathematically model a physical-fluid-flow related phenomenon (Gao et al, 2020;Gao et al, 2021). CFD approach is used to solve strongly nonlinear problems.…”

Section: Wavementioning

confidence: 99%

The impact of initial imperfections on the fatigue assessment of tower flange connections in floating wind turbines: A review

Zou

Niu

et al. 2022

Front. Mar. Sci.

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During the massive manufactures and installations of fixed offshore wind turbines in China, initial imperfections were often found in the inspection. As more and more attentions and efforts of the wind energy sector have been devoted to deep waters with fixed and floating wind turbines (FWTs), the impact of such initial imperfections on fatigue assessment is paramount to the reliable design and safe operation, which warrant rigorous study. This paper presents a comprehensive review of three different initial imperfections and their impacts on the fatigue lifetime of FWTs’ tower flange connections. A brief introduction on FWTs and flange connections is provided at first. This is followed by a detailed discussion of the environmental loadings and fatigue assessment on the flange bolted connections. Finally, a comprehensive review of the state-of-art research on three common initial imperfections, including flatness divergence, bolt loosening and tower inclination, are presented. Their impact on fatigue assessment is further discussed.

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Section: Wavementioning

confidence: 99%

The impact of initial imperfections on the fatigue assessment of tower flange connections in floating wind turbines: A review

Zou

Niu

et al. 2022

Front. Mar. Sci.

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“…The latter, including a higher-order spectral (HOS) method (Liu & Yue 1998), a fully nonlinear Boussinesq model (Gao et al. 2021) and Navier–Stokes solver models (Huang & Dong 2002; Hsu et al. 2014), have the potential to capture possible nonlinearities involved.…”

Section: Introductionmentioning

confidence: 99%

“…Mei 1985; Davies, Guazzelli & Belzons 1989;Chamberlain & Porter 1995;Porter & Porter 2003;Liu & Zhou 2014), although various nonlinear numerical simulations are also widely used. The latter, including a higher-order spectral (HOS) method (Liu & Yue 1998), a fully nonlinear Boussinesq model (Gao et al 2021) and Navier-Stokes solver models (Huang & Dong 2002;Hsu et al 2014), have the potential to capture possible nonlinearities involved. These theoretical and numerical studies as well as laboratory experiments (e.g.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Bragg scattering of surface waves over a two-dimensional periodic structure

et al. 2022

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Bragg scattering of nonlinear surface waves over a wavy bottom is studied using two-dimensional fully nonlinear numerical wave tanks (NWTs). In particular, we consider cases of high nonlinearity which lead to complex wave generation and transformations, hence possible multiple Bragg resonances. The performance of the NWTs is well verified by benchmarking experiments. Classic Bragg resonances associated with second-order triad interactions among two surface (linear incident and reflected waves) and one bottom wave components (class I), and third-order quartet interactions among three surface (linear incident and reflected waves, and second-order reflected/transmitted waves) and one bottom wave components (class III) are observed. In addition, class I Bragg resonance occurring for the second-order (rather than linear) transmitted waves, and Bragg resonance arising from quintet interactions among three surface and two bottom wave components, are newly captured. The latter is denoted class IV Bragg resonance which magnifies bottom nonlinearity. It is also found that wave reflection and transmission at class III Bragg resonance have a quadratic rather than a linear relation with the bottom slope if the bottom size increases to a certain level. The surface wave and bottom nonlinearities are found to play opposite roles in shifting the Bragg resonance conditions. Finally, the results indicate that Bragg resonances are responsible for the phenomena of beating and parasitic beating, leading to a significantly large local free surface motion in front of the depth transition.

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“…Previously, there was a considerable number of studies focused on hydrodynamic characteristics of aquaculture structures (Gao et al, 2020;Gao et al, 2021). Tsukrov et al (2003) proposed a consistent net element to predict the hydrodynamic forces on aquaculture net panels.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on the hydrodynamics of a multi-body floating aquaculture platform exposed to sloping seabed environment

Zhao

Xie

2022

Front. Mar. Sci.

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The coastal area near islands has become a key area for aquaculture because of the long offshore distance and suitable wave conditions. There is a topographic change near the islands, and the reflected waves generated by the topography modify the wave field in the aquaculture area, which may cause structural damage to the offshore net cage. Most studies on the hydrodynamic characteristics of aquaculture structures do not consider the effects of topography. Therefore, we investigated the hydrodynamic characteristics and wave field of a multi-body floating aquaculture platform under the influence of sloping seabed by leveraging a physical model approach. The results show that the low-frequency component of the surge motion of the cage on the weather side increases significantly under the influence of sloping seabed. However, the heave and pitch motions change slightly. Considering the presence of the sloping seabed, the wave elevations inside cages have been changed too., The wave breaking inside the cage on the weather side becomes more evident when the incident wavelength is equal to the width of the cage. And its wave response gradually shifts from wave frequency to high frequency. Regarding the cage on the lee side, the wave response inside it is positively correlated with the incident wavelength. The results of this study provide a reference for the design and optimization of aquaculture structures anchored near islands.

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Investigation on the effects of Bragg reflection on harbor oscillations

Cited by 192 publications

References 52 publications

The impact of initial imperfections on the fatigue assessment of tower flange connections in floating wind turbines: A review

The impact of initial imperfections on the fatigue assessment of tower flange connections in floating wind turbines: A review

Nonlinear Bragg scattering of surface waves over a two-dimensional periodic structure

Experimental investigations on the hydrodynamics of a multi-body floating aquaculture platform exposed to sloping seabed environment

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