Article
Engineering, Marine
H. Yamashita, A. Arnold, P. M. Carrica, R. W. Noack, J. E. Martin, H. Sugiyama, C. Harwood
Summary: This study presents a methodology for simulating the transitions of amphibious vehicles between land and marine modes in the surf zone. It combines existing solvers for multibody and fluid dynamics and introduces new features for the combined solver. Controllers are implemented to simulate autonomous operations of the vehicle. The proposed approach is validated through experimental results and simulations of autonomous amphibious vehicle operations in surf zones with breaking waves.
Article
Oceanography
Roxanne J. Carini, C. Chris Chickadel, Andrew T. Jessup
Summary: This study focuses on remote observation and wave-by-wave analysis of spilling and plunging waves breaking, finding differences in key parameters between the two types of breaking waves. Additionally, wave face slope and gamma are identified as useful indicators for determining the type of wave breaking.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Roxanne J. Carini, C. Chris Chickadel, Andrew T. Jessup
Summary: This study presents an extensive methodology to combine data from a line-scanning LIDAR and thermal infrared cameras for remote observation and wave-by-wave analysis of breaking waves in the surf zone. The researchers analyzed a large number of non-breaking and breaking waves to improve breaker parameterizations, estimating wave height, instantaneous wave speed, wave slope, and breaking wave face foam coverage. The results provide insights into improving model assumptions and enhancing understanding of wave dynamics in the surf zone.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Engineering, Marine
Jen-Yi Chang, Chia-Cheng Tsai
Summary: This study investigates the combined effect of breaking and energy dissipation of water waves by variable bottoms in the surf zone. The shoreline is modeled as a partially reflecting vertical wall, with steps approximating the geometric profile of the varied bottom. The proposed model uses conservation laws to match eigenfunctions over the shelves, and incorporates breaking and energy dissipation through empirical formulas.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Haigang Tian, Xiaobiao Shan, Han Cao, Tao Xie
Summary: This paper conducts detailed simulation analyses of an airfoil-based piezoaeroelastic energy harvester with two degrees of freedom motion, investigating the effects of key structural parameters on performance and identifying crucial factors affecting the harvesting efficiency.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Mechanics
Haifei Chen, Qingping Zou
Summary: This study investigates the effects of wind on the evolution of breaking waves due to dispersive focusing. The results show that following wind delays breaking and shifts the breaking location downstream, while opposing wind has the opposite effect. The wind-induced drift current is mainly responsible for these shifts. The shift of breaking location and time is approximately linearly proportional to the wind speed under weak winds, but saturates under strong winds. Strong wind forcing enhances the initiation of wave breaking, while strong opposing wind may change breaking type or suppress wave breaking of large intensity. The wave shape at breaking onset is altered considerably under strong winds.
Article
Engineering, Ocean
Ting Cui, Arun Kamath, Weizhi Wang, Lihao Yuan, Duanfeng Han, Hans Bihs
Summary: This study investigates the wave loading on cylinders in a pile group under different arrangements using numerical simulations. The results show that the wave forces on cylinders are affected by the relative distance and pile arrangement.
JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Geosciences, Multidisciplinary
Kevin Martins, Philippe Bonneton, Olivier de Viron, Ian L. Turner, Mitchel D. Harley, Kristen Splinter
Summary: Accurately mapping the changing underwater topography in wave-breaking areas is challenging but crucial for understanding sandy beach morphodynamics. Existing linear depth-inversion algorithms face theoretical and/or technical issues in the surf zone, limiting their accuracy. In this study, we propose a new depth-inversion approach based on Boussinesq theory, which quantifies nonlinear dispersion effects in nearshore waves. Experimental results show that this approach significantly improves accuracy in the surf zone, making it a promising method for practical applications using remote sensing technologies.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Marine
Yuan Li, Chi Zhang, Jiacheng Song, Shanhang Chi, Shaohua Zhao, Hongshuai Qi, Jian Shi
Summary: The study reveals the significant influence of tidal levels on wave characteristics and breaking regimes, particularly in the intertidal zone where wave protection and disaster mitigation are crucial.
Article
Engineering, Civil
Marc Batlle Martin, Jeffrey C. Harris, Jean-Francois Filipot, Florian Hulin, Alan Tassin, Paul Renaud
Summary: This paper presents new results on numerical simulations of breaking wave impacts on a surface-piercing cylinder. The computational fluid dynamics solver code_saturne, using the volume of fluid approach, is used for offshore hydrodynamics. The numerical results are compared with experimental data and show good agreement in terms of force impulse but need improvement in maximum force. The study describes the fluid shape and kinematics during the breaking process and investigates the load produced by a plunging breaker on a rigid cylinder.
COASTAL ENGINEERING
(2023)
Article
Engineering, Marine
Michael E. Thompson, Alex Atkinson, Evan Watterson, Nick Naderi, Heiko Loehr, Tom E. Baldock
Summary: This paper presents a camera-based measurement method called Wave Peel Tracking (WPT) for quantifying wave breaking over submerged structures designed for surf amenity. The WPT algorithm was successfully applied in the wave basin through controlled artificial lighting, image rectification, and classifier model modification. The accuracy of the WPT results was verified using overhead footage and showed similar results to the algorithm previously applied in the field. The results from testing various submerged structures under different wave conditions demonstrate the effectiveness of the WPT algorithm in quantifying surf amenity for design optimization.
Article
Engineering, Marine
Yung-Wei Chen, Cheng-Cheng Pan, Yi-Hsien Lin, Chao-Feng Shih, Jian-Hong Shen, Chun-Ming Chang
Summary: This study investigates the acoustic field radiated by propellers and underwater vehicles using numerical methods and experiments. The results show that water pressure can be used to estimate the magnitude of propeller thrust at different water depths. The simulated results are consistent with experimental values, demonstrating the accuracy and practicality of numerical procedures in engineering applications.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Tatsumasa Ishikawa, Hiroyuki Nishida, Yoshiyuki Tagawa
Summary: In this study, the impact of the number of bubbles on laser-induced microjet velocity is numerically investigated. The results show that the velocity of the microjet increases with the impulse of the pressure wave, but decreases with the increase in the number of bubbles. Additionally, the propagation of the pressure waves has two types.
Article
Thermodynamics
Guangchao Zhang, Xiaoxiao Zheng, Shi Liu, Minxin Chen, Caiqian Wang, Xueyao Wang
Summary: Wind energy is rapidly developing, but the sporadic and random nature of wind poses challenges to stable and efficient power supply. This paper proposes a tensor-based method that combines Tucker decomposition and computational fluid dynamics to reconstruct 3D wind velocity distributions. The proposed method accurately reconstructs wind fields and offers an innovative approach to short-term wind forecasting.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Civil
Chi Zhang, Yuan Li, Yu Cai, Jian Shi, Jinhai Zheng, Feng Cai, Hongshuai Qi
Summary: The study reveals a composite dependence of the wave breaker index gamma on both offshore wave steepness and normalized local water depth, proposing a new gamma formula that significantly improves wave height prediction accuracy. There are two counteractive physical mechanisms at play, the breaking intensification mechanism and the breaking resistance mechanism, explaining the opposite relationships between gamma and water depth under different offshore wave steepness conditions.
COASTAL ENGINEERING
(2021)
