Article
Chemistry, Multidisciplinary
Chaoqun Wang, Xugang Hua, Zhiwen Huang, Qing Wen
Summary: Research has been conducted on the aerodynamic characteristics of coupled twin cylinders in cross flow and their effects on synchronous galloping. Experimental results show that there are two typical flow patterns around twin cylinders with different spacing, and there is a critical spacing below which vortex shedding of the upstream cylinder is suppressed by the downstream cylinder. This leads to a peak in total lift force for the twin cylinders.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Civil
F. H. Robertson, D. Soper, C. Baker
Summary: Through experiments and analysis, the study revealed two unstable flow modes in long platoons, as well as their impacts on vehicles within the platoon.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2021)
Article
Construction & Building Technology
Dehui Ouyang, Weichao Yang, E. Deng, Youwu Wang, Xuhui He, Linbo Tang
Summary: The study aims to investigate the influence of the presence and absence of a tunnel portal on the aerodynamic performance of a moving train through wind tunnel tests. The results suggest that the tunnel portal can cause serious distortion of the aerodynamic load amplitude, and the appropriate model testing should take into account the scale ratio and Reynolds number.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Civil
Wei-Wei Guo, Bao-Shuo Cai, Fei-Xia Sun, Bao-Ze Ni, Peng-Yu Chen
Summary: An experimental and numerical study was conducted to investigate the aerodynamic characteristics of train vehicles on a truss bridge and the surrounding flow field. The results showed that the pressure coefficients on the surface of the train vehicle were significantly reduced when it moved from a box deck to a truss deck. The flow field inside the truss structure was uneven, with higher wind speeds occurring near the leeward truss panel.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Engineering, Multidisciplinary
Yiping Wang, Ziyi Zhang, Qianwen Zhang, Zhen Hu, Chuqi Su
Summary: This study investigates the aerodynamic performance and dynamic response of a sedan passing by a bridge pylon in crosswind using a dynamic coupling method of computational fluid dynamics (CFD) coupled with multibody dynamics. The results demonstrate the significant influence of the flow field around the sedan on its behavior, with step crosswind producing the largest lateral force and yaw moment. The dynamic coupling method provides a more realistic way to understand the interaction between aerodynamic loads and dynamic responses.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Metallurgy & Metallurgical Engineering
Hu Hao, Xiang Huo-yue, Liu Ke-hong, Zhu Jin, Li Yong-le
Summary: This article discusses the controlling factors in wind-vehicle-bridge systems when two trains pass each other and proposes a wind tunnel testing device to measure the aerodynamic characteristics of moving vehicles under crosswinds. The results show that the test device has good repeatability, and the intersection mode, yaw angle, and lane spacing affect the aerodynamic coefficients of the leeward train. Additionally, there is a significant difference in aerodynamic coefficients between the head vehicle and the tail vehicle.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Engineering, Civil
Cong Chen, Klaus Thiele
Summary: During the bridge-launching phase, steel-concrete composite bridge decks with bluff and lightweight cross section may be susceptible to galloping instability. Wind tunnel tests in turbulent flow showed that the incident turbulence can either promote or suppress the galloping instability of the open cross section deck.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Yunfeng Zou, Zhipeng Liu, Kang Shi, Jun Song, Xuhui He, Qingkuan Liu
Summary: This study systematically investigates the aerodynamic characteristics of a suspended monorail transport under crosswinds using wind tunnel tests. The effects of vehicle-bridge combinations and the aerodynamic coupling effects are examined. The results show that considering the aerodynamic coupling effects significantly increases the aerodynamic characteristics of the vehicle and bridge models. The location of the running vehicle has a significant impact on the aerodynamic characteristics of the bridge.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Engineering, Civil
Weichao Yang, Huan Yue, E. Deng, Youwu Wang, Xuhui He, Yunfeng Zou
Summary: This study investigates the influence of different turbulent conditions on the aerodynamic response of high-speed trains passing through a tunnel-bridge-tunnel section. The results show that turbulence intensity and average wind speed have a significant impact on the aerodynamic loads of the train, especially at the bridge section. A simplified pulsating incoming flow simulation scheme is proposed.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Engineering, Civil
E. Deng, Weichao Yang, Xuhui He, Zhihui Zhu, Hanfeng Wang, Youwu Wang, Ang Wang, Lei Zhou
Summary: The study shows that a wind barrier with a height of 3 meters and 30% porosity in the bridge-tunnel section can significantly weaken the sharp change effect of the aerodynamic coefficient of high-speed trains, thus reducing train safety. Additionally, the wind barrier can reduce the aerodynamic fluctuation amplitudes in the bridge-tunnel section and minimize the difference in pressure distribution in the longitudinal direction.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2021)
Article
Chemistry, Analytical
Yunfeng Zou, Zhipeng Liu, Kang Shi, Shuangmei Ou, Xuhui He, Honggui Deng, Shuai Zhou
Summary: This study systematically investigates the aerodynamic characteristics and interference effects of the suspended monorail (SM) vehicle-bridge system under various spacing ratios. A wireless wind pressure acquisition system is proposed for multi wind pressure test taps synchronization. The recommended spacing ratio of 3.5 ensures the running safety and stability of the SM system under exposure to crosswinds.
Article
Thermodynamics
Qing Xie, Yuen Liu, Min Yao, Hua Zhou, Zhuyin Ren
Summary: Jacobian clustering is proposed to reduce the computational cost in reactive flow simulations by clustering the evaluation and factorization of the system Jacobian, achieving fast convergence of the Newton iteration.
COMBUSTION AND FLAME
(2022)
Article
Engineering, Mechanical
Xiao-Hui Zeng, He-Mu Shi, Han Wu
Summary: This study established a dynamic analysis model of railway vehicles considering the influences of aerodynamic loads, and found that under unsteady aerodynamic loads, the vehicle system usually exhibits quasi-periodic motion with significant differences in amplitude and phase, containing abundant frequency components in the dynamic responses.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Civil
Weichao Yang, Huan Yue, E. Deng, Xuhui He, Yunfeng Zou, Youwu Wang
Summary: This study investigates the difference in calculation results of three turbulence models (LES, IDDES, and URANS) when a high-speed train runs on a tunnel-bridge section. The results show that the turbulence model has a significant impact on the aerodynamic loads, particularly in the head carriage. The URANS model yields higher values for side force, lift force, rolling moment, yawing moment, and pitching moment compared to the LES model. A formula is proposed to quantitatively describe the relationship between the side force amplitude calculated by the URANS model and the corresponding value of the LES model, which can be used to correct the boundary inflow wind speed conditions of the URANS model.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Energy & Fuels
Olga Poddaeva, Pavel Churin
Summary: This study investigates the interaction between a long-span bridge and wind flow through wind tunnel experiments. Static and dynamic tests were conducted on a large-scale model of the bridge, examining its stability and oscillation amplitudes under different conditions. The influence of motor traffic and snow accretions on barriers was also evaluated, with no significant impact observed.
Article
Engineering, Multidisciplinary
Zia Ullah, Hasan Saeed Qazi, Ahmad Alferidi, Mohammed Alsolami, Badr Lami, Hany M. Hasanien
Summary: This study presents a novel method for optimizing energy trading within microgrids by using a hybrid of particle swarm optimization and gravitational search algorithms. The proposed approach promotes cooperative energy trading among microgrids and the main grid, considering network constraints and the uncertainty of renewable energy. Simulation results show that this method maximizes renewable energy utilization, reduces load burden on the main grid, and significantly decreases energy costs.
ALEXANDRIA ENGINEERING JOURNAL
(2024)
Article
Engineering, Multidisciplinary
Chin Joo Tan
Summary: In this study, the effect of mesh sensitivity on the hole-flanging process was investigated by varying the mesh layouts and punch surface meshing techniques. The results showed that the punch displacement and mesh parameters have significant effects on the wall thickness distributions and forming load profiles. Additionally, calibrating the simulation model's stiffness with the experimental peak load through matching the simulated peak load with the experimental peak under stability conditions was recommended.
ALEXANDRIA ENGINEERING JOURNAL
(2024)
Article
Engineering, Multidisciplinary
Wei-Chao Yang, Lun Zhao, E. Deng, Yi-Qing Ni, Wen Zhao, Yi-Kang Liu, De-Hui Ouyang
Summary: This paper establishes a three-dimensional coupled train-subgrade-wind dynamics model, and investigates the aerodynamic load variation and flow field mechanisms when high-speed trains transit different types of subgrade-cutting transition sections in crosswind conditions. The results indicate that the aerodynamic performance of the train deteriorates in these transition sections, and the aerodynamic load of the head car varies in different operating scenarios.
ALEXANDRIA ENGINEERING JOURNAL
(2024)
Article
Engineering, Multidisciplinary
Shashi Bhushan, Anoop Kumar, Eslam Hussam, Manahil SidAhmed Mustafa, Mohammed Zakarya, Wedad R. Alharbi
Summary: In the sample survey theory, accurate estimation of parameters is essential for survey practitioners. This paper suggests optimal classes of estimators by modifying conventional estimators under stratified ranked set sampling (SRSS). The suggested estimators have been shown to outperform traditional estimators, particularly regression (BLU) estimators, both theoretically and experimentally.
ALEXANDRIA ENGINEERING JOURNAL
(2024)
Article
Engineering, Multidisciplinary
Laila A. Al-Essa, Ahmed A. Soliman, Gamal A. Abd-Elmougod, Huda M. Alshanbari
Summary: In this study, the class of lifetime distributions with bathtub-shaped failure rate functions is examined. Statistical inference methods are used to estimate the parameters of the model, and the Bayesian approach is compared with classical methods. The study also discusses the evaluation of product relative merits based on lifetime duration under a hybrid censoring scheme.
ALEXANDRIA ENGINEERING JOURNAL
(2024)
Article
Engineering, Multidisciplinary
Mohammad Partohaghighi, Marzieh Mortezaee, Ali Akguel, Ahmed M. Hassan, Necibullah Sakar
Summary: The study introduces a new variant of the fractal-fractional diffusion equation using the fractal-fractional operator. It proposes a novel operational matrix technique to solve the equation, transforming it into an algebraic system. The study presents graphical and tabular representations of exact and approximated solutions, along with corresponding errors, and conducts comparative analysis of solutions at specific time points.
ALEXANDRIA ENGINEERING JOURNAL
(2024)