A review on the progress and research directions of ocean engineering

Tavakoli, Sasan; Khojasteh, Danial; Haghani, Milad; Hirdaris, Spyros

doi:10.1016/j.oceaneng.2023.113617

Cited by 56 publications

(7 citation statements)

References 737 publications

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“…The approach presented comprises the following three steps namely (1) Step I where CFD modelling by OpenFOAM is used for wave generation. A two-dimensional wave flume with a length of 30 m and height of 2.2 m is designed to generate waves at various observation points; (2) Step II that focuses more on the analysis of the autocorrelation of waves. To capture the lag feature of waves, an autocorrelation function is used.…”

Section: Methodsmentioning

confidence: 99%

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A deep learning method for the prediction of focused waves in a wave flume

Zhang

Tavakoli

Hirdaris

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Rogue waves pose a significant risk to marine safety, emphasizing the need to accurately predict their occurrence in the open ocean. However, the complexity of their evolution, which may involve nonlinear physical phenomena such as wave-wave interaction and modulation instability, makes this task challenging. Currently the reconstruction of rogue waves involves generating focused waves through the superposition of different spectral components of irregular waves that are in phase at the focusing point. Despite its effectiveness, this approach is limited. The paper introduces a deep learning method based on Long short-term memory (LSTM) to predict focused waves generated in a Computational Fluid Dynamics (CFD) flume in the time domain. The model is trained on 60% of the generated wave time series, with the remaining 40% used for both validation and testing. The results demonstrate that the proposed method can assist with the prediction of focused waves at various observation points, indicating its potential as a promising approach for predicting rogue wave behaviour in the ocean.

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Section: Methodsmentioning

confidence: 99%

“…Rouge waves can be a potential natural source of danger for ships and offshore structures as they can result in very large sea loads [1,2]. Over last decades, several ship accidents have been found to be triggered by such waves [3].…”

Section: Introductionmentioning

confidence: 99%

A deep learning method for the prediction of focused waves in a wave flume

Zhang

Tavakoli

Hirdaris

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In the riverbed scour problem, influenced by the coupling of many factors, the base scour of submerged structures is involved in a dynamic evolution process with a high Reynolds number, and most of the flow field is turbulent. The use of turbulence models in different problems dealing with energetic water flow is highly important, has been the topic of a great number of studies, and has received the attention of researchers over last decade, as discussed by Tavakoli et al [22]; thus, an accurate simulation of the turbulence characteristics of the flow field domain is the key to calculating the scour depth. Currently, the main turbulence simulations can be broadly classified as a direct numerical simulation (DNS), large eddy simulation (LES), and Reynolds average numerical simulation (RANS) [23][24][25].…”

Section: Turbulence Modelmentioning

confidence: 99%

Refined Simulation Study on the Effect of Scour Environments on Local Scour of Tandem Bridge Piers

Gao

Xian-you

2023

Sustainability

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Ice cover is a natural phenomenon unique to rivers in cold regions, and its existence is one of the reasons for the collapse of structural foundations of bridge piers across rivers. In order to understand the influence of different scouring environments on the hydrodynamics and sand bed morphology in the local scour holes around bridge pier foundations, this paper simulates the dynamic evolution process of the local scouring of tandem combination piers under open-flow and ice-cover environments, based on a turbulence model using the Reynolds-averaged Navier Stokes (RANS) method and a sediment transport model considering the slope collapse effect, respectively. This study also takes the vortex flow and shear stress distribution at different characteristic moments of the pier perimeter section as the penetration point to analyze the effect of the influence law of the scouring environment on the morphology and relative time scale of the scour hole, and makes a detailed comparison with the results of the indoor flume test. The results of this study show that: for local scouring in open-flow conditions, sediment initiation is doubly inhibited and the hydrodynamic forces in the scouring hole are weakened; the local scouring caused by ice cover contributes to the total scouring of the submerged pier within its coverage area, which significantly increases the depth and range of the local scouring hole; and, although the interaction of turbulent eddies and shear stress on the pier side is the main dynamic mechanism of the scouring generated around the pier, the two have a strong correlation. The results of this study, obtained by accurately quantifying the amount of eddies and shear stress around the pier, are the basis for the reasonable estimation of the maximum local scouring depth, which can provide a reference for the study of the evolution of the riverbed around submerged structures in cold areas and is essential to avoid structural damage to the piers and reduce the economic loss of traffic..

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“…With the expansion of marine resource exploration, the demand for marine engineering steel (hereinafter referred to as MES) has increased. [1,2] Extra-thick steel plates for marine engineering are widely used in the manufacture of large ships and the heavy marine engineering machinery. [3][4][5] Most traditional marine steel plates comprise Ni-Cr-Mo steel with a strength of 355-690 MPa or higher, and the thickness specifications are gradually increasing.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of a Marine Engineering Steel for Novel 980 MPa Grade Extra‐Thick Plate

Wang,

Ren,

Liu

et al. 2024

steel research int.

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The hot deformation behavior of a marine engineering steel for a novel 980 MPa grade extra‐thick plate is investigated through hot compression tests at temperatures of 850–1200 °C and strain rates of 0.01–10 s−1. The flow stress curves are corrected to eliminate the effects of friction on the flow stress, and a modified constitutive model is established to accurately quantify the flow behaviors of the steel. Hot working maps of the steel are derived by using a dynamic materials model and the Prasad instability criterion. The effects of the deformation parameters on the dynamic recrystallization (DRX) nucleation mechanisms are evaluated using scanning electron microscopy and electron backscatter diffraction. The flow stress and peak strain increased with decreasing deformation temperature and increasing strain rate, respectively. The activation energy for hot deformation after friction correction is 380.49 kJ mol−1. The DRX mechanism involves the migration of subgrains. The deformation parameters are optimized by combining the degree of DRX and the size of recrystallized grain. The optimum hot working window is determined as 1100–1200 °C and 0.1–10 s−1.

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A review on the progress and research directions of ocean engineering

Cited by 56 publications

References 737 publications

A deep learning method for the prediction of focused waves in a wave flume

A deep learning method for the prediction of focused waves in a wave flume

Refined Simulation Study on the Effect of Scour Environments on Local Scour of Tandem Bridge Piers

Hot Deformation Behavior of a Marine Engineering Steel for Novel 980 MPa Grade Extra‐Thick Plate

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