Article
Geochemistry & Geophysics
Jiangyang Zhang, Fan Zhang, Jian Lin, Hongfeng Yang
Summary: The convergence of tectonic plates at subduction zones causes flexural bending of the subducting plate, leading to normal faulting and influencing water budget and seismic behavior. 3-D plate bending deformations can affect slab pull force, particularly when deflection changes along the trench.
Article
Mechanics
Changze Zhao, Qian Wang, Haocheng Lu, Hua Liu
Summary: This study investigates the evolution of water entry cavity and the flow structures for a sphere interacting with periodic waves, using both numerical simulation and experimental validation. Large eddy simulation is applied to accurately capture the turbulent flow near the surface and within the cavity. An overset mesh-based numerical wave tank is developed to ensure high-resolution simulation of velocity fields. The experimental setup allows for precise control and validation of the computed results, showing good agreement between numerical and experimental results.
Article
Engineering, Aerospace
Johannes Ruhland, Florian M. Heckmeier, Christian Breitsamter
Summary: The study aims to impose disturbance on the near field of a wake vortex system of a high-lift transport aircraft configuration by oscillating flaps, excite long wave instabilities in the downstream development of the wake vortex system. Experimental and numerical results show that oscillating flaps can introduce significant disturbance in the wake vortex system's extended near field, with good agreement between experimental and numerical data.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
Nang X. Ho, Truong V. Vu, Binh D. Pham
Summary: The study presents numerical simulation results of an axisymmetric compound drop solidifying on a cold plate, showing that the solid-liquid interface solidifies first around the inner gas core and last at the drop top. The presence of an inner gas bubble prolongs the solidification time, with the solidification time decreasing with an increase in Stefan number or Bond number.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Geosciences, Multidisciplinary
Nathan L. Bangs, Julia K. Morgan, Rebecca E. Bell, Shuoshuo Han, Ryuta Arai, Shuichi Kodaira, Andrew C. Gase, Xinming Wu, Richard Davy, Laura Frahm, Hannah L. Tilley, Daniel H. N. Barker, Joel H. Edwards, Harold J. Tobin, Tim J. Reston, Stuart A. Henrys, Gregory F. Moore, Dan Bassett, Richard Kellett, Valerie Stucker, Bill Fry
Summary: When large seamounts collide with the overriding plate at subduction zones, it causes permanent deformation and creates structural and compositional heterogeneities that can control megathrust slip behavior. Subducting seamounts can either temporarily lock plates, leading to large earthquakes, or redistribute stress to reduce seismic slip. Three-dimensional seismic data from the Hikurangi Plateau off the coast of New Zealand's North Island reveals that the presence of seamounts uplift the overriding plate and leave sediment lenses in their wake, with low seismic velocities and overpressured fluid-rich sediments. These sediment lenses create zones that enable slow slip, as seen in the 2014 slow-slip earthquake event. This study suggests that sediment lenses left behind by subducting seamounts can maintain long-lasting fluid pressures and support slow-slip behavior at sediment-rich subduction zones.
Article
Thermodynamics
Zhicheng Pan, Ruiping Zhang, Xiaoyong Li, Ling Wang, Taihe Huang, Xiaoqing Zhang, Jianye Chen
Summary: In this paper, a new miniature Joule-Thomson (J-T) cryocooler was proposed and its steady-state cooling characteristics were analyzed via CFD numerical simulation. The performance characteristics were assessed for nitrogen under different inlet pressure and temperature, as well as different orifice widths. The results showed that the cooler had excellent cooling performance, small axial height and simple fabrication. The heat transfer increase improved the cooler stable operating temperature, and the minimum temperature could reach 138.3 K when the inlet pressure was 10 MPa. An optimal throttle orifice width delta value between 0.1 mm and 0.2 mm was found, which achieved maximum cooling capacity under minimum temperature.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Biotechnology & Applied Microbiology
Mohsen Nakhaei, Manon Sterba, Jean-Marc Foletti, Laurent Badih, Michel Behr
Summary: The increasing use of 3D-printed Ti6Al4V surgical implants for patient-specific medical orthopedic prostheses has raised uncertainties due to varying printing parameters, particularly in terms of fatigue limit. To address this issue, a stress-life fatigue analysis approach coupled with finite element simulation was used to numerically estimate the fatigue limit and failure location of 3D-printed surgical osteosynthesis plates, and the results were experimentally validated.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Construction & Building Technology
Mouayed H. Z. Al-Toki, Wael Najm Abdullah, Ridha A. Ahmed, Nadhim M. Faleh, Raad M. Fenjan
Summary: This study numerically investigates the dynamic characteristics of sandwich plates under periodic and thermal loads. The stability boundaries of the sandwich plate are found to depend on load parameters, porosities, skin thickness, and temperature.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Anchen Ni, Zhifei Shi
Summary: In this study, the concept of topological insulator is introduced into plates in civil engineering, and successfully obtains topologically protected interface states of flexural waves. Through topological wave transport between two domains with distinct topological phases, this novel topological metamaterial plate realizes wave guiding and wave attenuation simultaneously. The influence of geometric and material parameters on the interface states and band gap is discussed in detail. The dynamic characteristics of this novel type of plate are studied through full-field simulation in the frequency domain and experimentally validated. The study demonstrates high transmission efficiency and strong robustness against defects. The performance of the topological metamaterial plate in ambient vibration control is assessed based on measured acceleration records, facilitating the application of topological insulators in vibration mitigation, energy harvesting, and signal detection.
ENGINEERING STRUCTURES
(2023)
Article
Geosciences, Multidisciplinary
Adam F. Holt
Summary: Subduction zones generate pressure fields that cause dynamic topography on Earth's surface. However, global mantle flow models often oversimplify subduction zones and associated pressure fields. This study reveals the existence of positive pressure and resultant uplift beneath subducting plates, which can be better predicted by incorporating subduction zones into mantle flow models.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
B. Thawani, R. Hazael, R. Critchley
Summary: The study found that a layer of compressed sand formed around the projectile aids in energy absorption and dissipation during impact. The addition of plates improved the energy absorption characteristics, with Aluminum plates being the preferred choice for a modified sandbag.
JOURNAL OF COMPUTATIONAL SCIENCE
(2021)
Article
Acoustics
Xiang Wan, Meiru Liu, Xuhui Zhang, Hongwei Fan, Qinghua Mao, Ming Dong, Xing Wang, Hongwei Ma
Summary: In this study, the excitation and propagation of ultrasonic guided waves were proposed for detecting defects in hexagonal pipes. Through deriving dispersion curves, the longitudinal L(0, 2) mode was selected for inspection. The results demonstrated the promising and effective alternative of using ultrasonic guided waves for defect detection in hexagonal pipe structures.
SHOCK AND VIBRATION
(2021)
Article
Mechanics
Xinran Zhao, Zongxin Yu, Jean-Baptiste Chapelier, Carlo Scalo
Summary: This paper investigates the pre- and post-reconnection dynamics of a trefoil knotted vortex, finding that the self-advection velocity before reconnection scales with inviscid parameters and reconnection occurs earlier and more rapidly at higher Reynolds numbers. The vortex propagation velocities after reconnection are affected by viscous effects, with the larger vortex ring carrying most of the helicity and enstrophy. The total helicity dissipation rate agrees reasonably well between large-eddy simulations and direct numerical simulations, with vortex centerline helicity and vortex-tube-integrated helicity being less sensitive to the reconnection process.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Geography, Physical
Makoto Matsubara, Katsuhiko Shiomi, Hisatoshi Baba, Hiroshi Sato, Takahito Nishimiya
Summary: The study used seismic station data to analyze the seismic velocity structure below 40-60 km depth in the Tokai region, revealing the subduction structure and surface geometry of the PHS plate.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Construction & Building Technology
Tinghong Pan, Huaijin Teng, Hengcheng Liao, Yaqing Jiang, Chunxiang Qian, Yu Wang
Summary: This study achieved precise control of the shape of 3D printed cement-based structures, elimination of curved sides and internal stress concentration, and enhancement of mechanical properties through a specially designed shaping plate apparatus. Results show that the shaping plate apparatus effectively constrains the expansion of extrudate, improves the surface finish quality and mechanical properties of the printed structure.
CEMENT AND CONCRETE RESEARCH
(2022)