Article
Engineering, Marine
Dong Jin Kim, Hujae Choi, Kunhang Yun, Dong Jin Yeo, Yeon Gyu Kim
Summary: This paper investigates the turning characteristics of KVLCC2 tanker in long-crested irregular waves through 1/100 scaled free-running model tests. It is found that the drifting distances of steady turning trajectories increase with increasing sea states, and turning trajectories in irregular waves are more complex compared to regular waves.
Article
Mechanics
C. Lawrence, K. Trulsen, O. Gramstad
Summary: Experimental and numerical evidence suggest that nonuniform bathymetry can significantly alter the statistical properties of surface elevation in irregular wave fields. When long-crested irregular waves propagate into shallower water, the probability of rogue waves increases near the edge of the upslope. The statistics of horizontal fluid velocity differ from those of surface elevation, especially in cases of abrupt depth changes in shallow water, with non-Gaussian statistics observed.
Article
Engineering, Marine
Dag Myrhaug, Muk Chen Ong
Summary: This article derives the time scale of pipeline scour caused by 2D and 3D nonlinear irregular waves and current for wave-dominant flow, providing a simple engineering tool for assessing equilibrium pipeline scour. The method assumes the random wave process to be stationary and narrow banded, applicable to a range of random waves plus current flow conditions.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Mechanics
Junpeng Liu, Xingya Feng, Junnan Cui
Summary: The PB solution of the nonlinear Schrodinger equation is used to model ocean extreme waves, showing triangular spectral features over the nonlinear evolution. A background random wave is superposed to the PB to simulate a more realistic sea state. Spectral analysis reveals that the wave elevations exhibit similar triangular spectral features with a relatively mild background wave. Furthermore, the second harmonic elevations of the extreme waves also exhibit triangular spectral features, suggesting the potential use of both first and second harmonic elevations for the detection of extreme wave formation.
Article
Mechanics
Danny Dunbar, Dominic A. A. van der A, Pietro Scandura, Tom O'Donoghue
Summary: The hydrodynamics of turbulent oscillatory flow over a gravel-based irregular rough wall is studied using experimental measurements and numerical simulation. Four different flow shapes are investigated, and the results show good agreement with previous studies. Evidence of Prandtl's secondary flows and turbulence structures are observed. Non-Gaussian turbulence statistics are observed near the wall. The results provide valuable insights into the characteristics of turbulent oscillatory flow over a rough wall.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Environmental Sciences
Hung-Jie Tang, Ray-Yeng Yang, Hao-Cheng Yao
Summary: The study investigates the hydrodynamic behaviors of mooring line failure in net cages under irregular waves and currents. Experimental and numerical analyses show that the remaining mooring line experiences increased load and the floating collar undergoes significant yaw rotation when one of the upstream mooring lines is disconnected. Furthermore, increasing current velocity leads to higher tension, drift displacement, and rotational angles.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Engineering, Ocean
S. Draycott, P. K. Stansby, M. L. McAllister, T. Davey, L. Jordan, T. Tosdevin, M. Hann
Summary: This study assesses a time-reversal approach for accurately replicating experimentally generated irregular wave fields numerically, demonstrating its effectiveness in different laboratories and various sea states.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Ocean
Weijie Liu, Yushi Liu, Xizeng Zhao, Yue Ning
Summary: The study investigated irregular wave propagation over sinusoidal bars on the reef flat using the Boussinesq model FUNWAVE-TVD. Results showed that increasing the amplitude of sinusoidal bars can enhance the Bragg reflection of irregular waves, while increasing the number of sinusoidal bars has no regular effect.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Civil
Julie Caroe Kristoffersen, Henrik Bredmose, Christos Thomas Georgakis, Fabio Pierella
Summary: A wind-forcing model is implemented into a fully nonlinear potential flow solver for water wave propagation. The model is capable of simulating a large number of waves and generating fully nonlinear wave kinematics. The effect of wind on waves is examined, and the model is calibrated and validated using experimental data. The results show that wind leads to increased wave steepness, a larger number of breaking waves, and an increase in local forces near the free surface.
COASTAL ENGINEERING
(2022)
Article
Mechanics
Jie Zhang, Michel Benoit
Summary: This study investigates the formation of abnormal waves in coastal areas through numerical analysis, highlighting the significant impact of non-equilibrium dynamics on extreme wave occurrence and the role of the de-shoaling process in modulating parameters and enhancing wave kurtosis.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Marine
Ying Tang, Shi-Li Sun, Hui-Long Ren
Summary: A three-dimensional fully nonlinear time domain method is introduced to simulate ship advancing in regular and irregular waves, using a mixed Eulerian-Lagrangian method and boundary element method. The spring analogy method is utilized to ensure mesh optimization, and auxiliary functions are deduced to decouple strongly nonlinear hydrodynamic forces and ship motion. The numerical results for a 13500 TEU container ship are validated against experimental data, showing good agreement in regular and irregular waves.
Article
Oceanography
Antoine Villefer, Michel Benoit, Damien Violeau, Christopher Luneau, Hubert Branger
Summary: A series of experiments were conducted in a wind-wave tank facility in France to study the effects of preexisting swell conditions on wind-wave growth. The presence of monochromatic long waves significantly reduced the energy of wind-waves, while the addition of JONSWAP-type long waves resulted in a downshift of the wind-wave peak frequency but no significant energy reduction. The study found that the presence of long waves affected the wind-wave energy and frequency variations with fetch.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2021)
Article
Engineering, Civil
Julie Caroe Kristoffersen, Henrik Bredmose, Christos Thomas Georgakis, Hubert Branger, Christopher Luneau
Summary: The study indicates that wind has an impact on waves and the structural load, altering wave morphology, increasing the number of breaking waves, and enhancing wave-induced pressure. Through experiments, the effect of wind on waves has been effectively explored.
COASTAL ENGINEERING
(2021)
Article
Environmental Sciences
Yanna Zheng, Yifan Zhou, Ruijia Jin, Yingna Mu, Ming He, Lingxiao Zhao
Summary: This study presents analytical solutions for analyzing wave dissipation and bottom flow characteristics of permeable submerged horizontal plates. The experimental results show that solid submerged plates effectively attenuate waves, with a greater effect at smaller depths. However, this attenuation effect becomes reduced after a certain threshold.
Article
Environmental Sciences
Beihan Jiang, Hui Zhang, Tuofu You, Yuanmin Sun, Chenming Fu, Weijie Liao, Feng Cai
Summary: As a marine ecological engineer, oyster reefs play important ecological functions and also reduce damage from waves to protective structures. Oyster reefs in shallow water change the nonlinear characteristics of waves and impact sediment transport and coastal evolution. Through analysis using Fourier spectrum and Wavelet Transform, the study examines the influence of artificial bag oyster reefs on the energy and nonlinear phase coupling of irregular waves through physical experiments. The results show that oyster reefs have a significant effect on wave energy and nonlinear interactions.
FRONTIERS IN MARINE SCIENCE
(2022)
