Article
Chemistry, Multidisciplinary
Neda Mardani, Mohammadreza Khanarmuei, Kabir Suara, Richard Brown, Adrian McCallum, Roy C. Sidle
Summary: The study demonstrates that assimilating Lagrangian data obtained from GPS-tracked drifters into a tidal channel for a few hours can significantly improve the modeled velocity fields (up to 30% herein). Additionally, a 40% improvement in residual current direction was achieved when assimilating both Lagrangian and Eulerian data.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Omar S. Salih, Hengan Ou, Wei Sun
Summary: This study developed a novel three-dimensional fully coupled thermo-mechanical finite element model based on the Coupled Eulerian-Lagrangian approach to simulate the friction stir welding (FSW) process. The model successfully captured the evolution of temperature, plastic deformation, and residual stresses and was validated with experimental testing. The results revealed that the tool rotation speed significantly influenced temperature evolution and plastic deformation, with higher plastic deformation resulting in improved weld quality.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Mathias Klahn, Per A. Madsen, David R. Fuhrman
Summary: This study focuses on the mean and variance of fluid velocities below the surface in deep water irregular wave fields, deriving new asymptotic approximations using second-order potential flow theory. The accuracy of the formulations is tested against fully nonlinear simulations of irregular wave fields, showing good match even in the presence of third-order effects. This marks the first fully nonlinear investigation of Eulerian and Lagrangian velocities below the surface in irregular wave fields.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Engineering, Industrial
Shenliang Yang, Xiaoliang Jin, Serafettin Engin, Raja Kountanya, Tahany El-Wardany, Seung-Yub Lee
Summary: Cutting fluid is essential in machining for prolonging tool life and improving surface quality. The use of cutting fluid can reduce surface tensile residual stress and create a more uniform shrinkage of the workpiece material.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Marine
Sheng Yan, Zhili Zou, Zaijin You
Summary: This study derives the Eulerian description of the Stokes drift effect on tracer transport, showing that it can be automatically accounted for in the wave-averaged advection-diffusion equation. The theoretical analysis is verified through numerical simulations and experimental observations.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Mohamed Ragab, Hong Liu, Guan-Jun Yang, Mohamed M. Z. Ahmed
Summary: A numerical simulation study of the FSW of 1Cr11Ni2W2MoV steel showed good agreement with experimental results at different tool rotation rates. The peak temperature, plastic strain, surface roughness, and flash size increased with an increase in tool rotation rate. Lack-of-fill defect and an asymmetrical stir zone were observed at the highest tool rotation rate.
APPLIED SCIENCES-BASEL
(2021)
Article
Meteorology & Atmospheric Sciences
Jinzhen Yu, Xueqing Zhang, Xiaoxuan Sheng, Wensheng Jiang
Summary: Using a numerical hydrodynamic model and Lagrangian particle tracking method, this study derived the Lagrangian flow network and Lagrangian residual velocity in the tide-dominant Bohai Sea. The characteristics of the Lagrangian flow network show distinct regional features and the Lagrangian residual velocity can be well maintained over multiple tidal periods. The mechanism behind these features was explained theoretically. This research provides insights into analyzing flow and transport pathways in shallow, tide-dominated coastal regions using the Lagrangian flow network.
Article
Engineering, Environmental
Xiaomei Zhong, Yongsheng Wu, Charles Hannah, Shihan Li, Haibo Niu
Summary: This study used a combination of FTLE values, residual currents, and tidal excursion lengths to investigate the effects of tidal dispersion on oil spill trajectories. The results showed that tidal type and phase significantly influenced the FTLE fields, and transport barriers formed in certain areas of the inlet. The FTLE analysis was found to be reliable for oil spill tracking and could be a valuable tool for oil spill response planning.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Atul Kumar Choudhary, Rahul Jain
Summary: In this study, a numerical model based on the coupled Eulerian-Lagrangian method and the Volume of Fluid concept was developed to predict and analyze various types of defects in friction stir welding. The effect of process parameters on defect formation was investigated, and a process parameter window indicating defective and non-defective weld conditions was established.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Manufacturing
Yang Liu, Dongdong Xu, Mathias Agmell, Aylin Ahadi, Jan-Eric Stahl, Jinming Zhou
Summary: This study investigates the influence of previous cuts on surface residual stresses in multiple cuts of Inconel 718 alloy, considering cutting parameters, procedure, and tool geometries. Results show that accumulated stress/strain from previous cuts lead to a more curled chip morphology and affect cutting forces in subsequent cuts. Optimizing previous cuts can control residual stress levels for desired surface integrity.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Environmental Sciences
Suhui Qian, Yunfei Du, Zilu Wei, Jicai Zhang, Jun Cheng, Daosheng Wang, Ya Ping Wang
Summary: In this study, the effects of different bottom friction coefficient (BFC) parameterization schemes on tidal modelling in the East China Seas were investigated. The results showed that the spatial varying BFC scheme (SV-BFC) outperformed others, with amphidromic point locations different from the empirical constant (EC-BFC) and sediment-dependent form (SD-BFC) schemes.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Mechanics
Sidhartha Sankar Roy, Kishore Chandra Biswal
Summary: This study investigates the non-linear slosh dynamics of a sloped wall tank with a bottom-mounted object under seismic excitation. The potential flow theory is used to model the liquid domain using a mixed Eulerian-Lagrangian method. The study successfully quantifies the non-linear seismic response of the tank and the influence of the internal object on the hydrodynamic behavior. A parametric investigation is conducted by altering the object's height. Comparison with linear analysis justifies the necessity of non-linear analysis. The developed non-linear finite element model is found to be more effective and can be used in designing structure-coupled sloped wall TLDs.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2024)
Article
Environmental Sciences
Jie Zhang, Guang Li, Li Shi, Ning Huang, Yaping Shao
Summary: This study hypothesizes that large eddies are crucial in the entrainment of aeolian particles. Wind-tunnel experiments were conducted to measure the particle entrainment rate under various conditions. By using a fluttering cloth, large eddies similar to convective eddies, referred to as quasi-convective turbulence, were generated. The results show that quasi-convective turbulence increases surface shear stress and enhances the entrainment of sand and dust particles.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Metallurgy & Metallurgical Engineering
Tie Yi, Sheng-dan Liu, Chen Fang, Geng-duo Jiang
Summary: This study investigates the role of oxides in the formation of hole defects in the friction stir welded joint of 2519-T87 aluminum alloy. It is found that oxides are present at the edge of tunnel hole and in the micropores in the joint. The oxides tend to aggregate in the weak region of material flow, preventing material contact and diffusion, resulting in hole defects.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Engineering, Mechanical
Chun Lu, Jiabao Yin, Jiliang Mo, Junyong Wang
Summary: This study proposes a simulation methodology using finite element modeling, Archard theory, and Arbitrary Lagrangian-Eulerian (ALE) technique to predict the accumulated wear degradation of railway friction blocks. The method is validated through tribological and dynamic behavior tests during the running-in and formal testing processes. The results show that the contact area increases during running-in, while the average contact pressure initially decreases and then fluctuates around a stable value. In formal testing, the wear mass of the friction block increases with the number of braking cycles, but the growth rate decreases rapidly in the first few cycles and then slows down. The proposed method has a prediction error of less than 5% for accumulated wear mass. This research provides a deep understanding of the wear degradation mechanism of friction blocks and offers an effective method for predicting friction block wear degradation.
Article
Geosciences, Multidisciplinary
Masaru Yamamoto, Naoki Hirose
GEOPHYSICAL RESEARCH LETTERS
(2011)
Article
Engineering, Ocean
Eunjeong Lee, Yign Noh, Naoki Hirose
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
(2013)
Article
Oceanography
Jae-Hong Moon, Naoki Hirose, Akihiko Morimoto
JOURNAL OF OCEANOGRAPHY
(2012)
Article
Oceanography
Naoki Hirose
JOURNAL OF OCEANOGRAPHY
(2011)
Review
Oceanography
Satoshi Nakada, Naoki Hirose, Tomoharu Senjyu, Ken-ichi Fukudome, Toshihiro Tsuji, Noriyuki Okei
PROGRESS IN OCEANOGRAPHY
(2014)
Review
Oceanography
Jae-Hong Moon, Naoki Hirose
PROGRESS IN OCEANOGRAPHY
(2014)
Article
Meteorology & Atmospheric Sciences
Shusaku Sugimoto, Naoki Hirose
Review
Geosciences, Multidisciplinary
Jae-Hong Moon, Naoki Hirose, Ig-Chan Pang, Kyung Hoon Hyun
TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
(2012)
Article
Oceanography
Sooyeon Han, Naoki Hirose, Shinichiro Kida
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2018)
Article
Oceanography
Daehyuk Kim, Hong-Ryeol Shin, Cheol-Ho Kim, Naoki Hirose
CONTINENTAL SHELF RESEARCH
(2020)
Article
Oceanography
Shinichiro Kida, Katsumi Takayama, Yoshi N. Sasaki, Hiromi Matsuura, Naoki Hirose
Summary: Research indicates that the increasing trend in the transport of the Japan Sea Throughflow is linked to a northward shift in the Kuroshio axis, causing sea levels to rise along the southern coast of Japan. This signal then propagates anticyclonically along the coast as topographic Rossby waves and Kelvin waves, leading to an increase in transport through the Tsushima Strait.
JOURNAL OF OCEANOGRAPHY
(2021)
Article
Engineering, Marine
Jeong-Yeob Chae, Chanhyung Jeon, Pyeongjoong Kim, Naoki Hirose, Ahyoung Ku, Jae-Hun Park
Summary: The passage of typhoons can lead to changes in the ocean environment, affecting the energy of internal tides. The tilting of the pycnocline towards the coast allows for the propagation of tidal energy towards shallow regions, while downwelling events deepen the pycnocline and concentrate energy near the coast. The study proposes a mechanism to explain the observed variations in tidal energy near the coast.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Marine
Bin Wang, Lei Wu, Ning Zhao, Tianran Liu, Naoki Hirose
Summary: This study investigated the features of coastal upwelling in the southwestern Yellow Sea using oceanology data and a regional circulation model. It found that in addition to tidal-induced upwelling, the summer monsoon plays a critical role in vertical circulation in the region. The study also suggests that changes in the summer monsoon and its curl may have contributed to the formation of upwelling in the past decade.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
M. Yamamoto, T. Ohigashi, K. Tsuboki, N. Hirose
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2011)