Article
Mechanics
Alessandro Chiarini, Davide Gatti, Andrea Cimarelli, Maurizio Quadrio
Summary: This study investigates the turbulent flow past a rectangular cylinder to understand the contribution of small and large scales to the sustaining mechanism of velocity fluctuations. The findings reveal forward and reverse energy transfers in the flow at the same time, with independent sources of velocity fluctuations acting at different scales.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Keunseob Lee, Yasuaki Kozato, Satoshi Kikuchi, Shigeki Imao
Summary: The control mechanism of a dielectric barrier discharge plasma actuator is investigated through numerical simulations in the flow field around a square cylinder. The study explores conditions for the burst frequency of the actuator and achieves a good control effect by repressing vortex shedding and reducing drag and lift coefficients through vortex interactions.
Article
Mechanics
Yang Liu, Sitao Ren
Summary: The study investigates the convective boundary layer flow on the external surface of an isothermally heated horizontal cylinder through numerical simulations. The results show that the curved boundary layer experiences initial growth, transitional, and developed states, with varying characteristics of velocity and thickness at different stages. The proposed scale relations provide a reasonable description of the curved boundary layer flow, with regression constants above 0.99.
Article
Engineering, Civil
Pengcheng Zou, Shuyang Cao, Jinxin Cao
Summary: In this study, the spanwise correlation and coherent structure of separated flow around a rectangular cylinder with a side ratio of B/D = 5 were numerically investigated using Large Eddy Simulation (LES) at Reynolds number Re = 22,000. The results showed the existence of a spanwise coherent flow structure associated with longitudinal vortices, with a wavelength of around 1.4D. A spanwise length of 3D was found to be sufficient in eliminating the influence of the spanwise coherent flow structure on the global aerodynamic parameters. The spanwise correlations of sectional forces and surface pressures decayed with increasing spanwise distance, and a finer spanwise resolution resulted in decreased spanwise correlations within the investigated range. The results also emphasized the need to consider multiple interacting factors, such as numerical method, three-dimensional grid discretization, and turbulence model, when selecting the spanwise resolution.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Thermodynamics
Sedem Kumahor, Mark F. Tachie
Summary: This study investigates the effects of Reynolds number (Re) on wake characteristics, Kelvin-Helmholtz instabilities, and von-Kármán vortex shedding process around a short rectangular cylinder with a length to height ratio of 0.5, using particle image velocimetry. The Reynolds numbers, based on the cylinder height and free-stream velocity, range from 3000 to 21000. Analyses of the flow characteristics reveal that the size of the wake vortex decreases but the magnitudes of the Reynolds stresses increase with increasing Re until Reynolds number independence is reached at Re = 10000. Regardless of the Reynolds number, spectral analyses, proper orthogonal decomposition, and flow visualization techniques show consistent results.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2023)
Article
Materials Science, Characterization & Testing
Benli Wan, Bin Hu, Xingle Chen
Summary: The study investigates the eddy current induction of a flexible eddy current array probe, composed of thin curved circular spiral coils, using the second-order vector potential formalism. Analytical expressions for the self-and mutual impedance change of coil array elements inside a conductive tube under three standard eddy current array operation modes are derived. The study finds that the coefficient matrices of characteristic equations in the different modes are the same regardless of the element's placement inside or outside the tube, facilitating quick solutions through transformation relationships.
NDT & E INTERNATIONAL
(2022)
Article
Engineering, Marine
Bin Liu, Renjie Jiang
Summary: The vortex-induced vibrations (VIV) of an elastically mounted rectangular cylinder with one degree of freedom in a viscous incompressible uniform flow were studied using the lattice Boltzmann method. The results showed that the side ratio and mass ratio have significant influences on the behaviors of the fluids and structures. The resonance can be extensively excited and its region expands with decreasing side ratio and mass ratio. Three distinct vortex wake modes were observed. Mechanistic analysis indicated that the shift of oscillation frequency was induced by the competition between the wake mode and structure mode, and large-amplitude vibrations in the resonance region were caused by power transfer between the fluids and structures. The excitation of wake mode was associated with the cylinder shape and response amplitude, and the process of vortex formation had significant influences on the cylinder motion.
Article
Thermodynamics
Nepal Chandra Roy, Md Anwar Hossain, Rama Subba Reddy Gorla, Sadia Siddiqa
Summary: This study investigates natural convective flow and heat transfer around a locally heated circular cylinder kept in a rectangular enclosure. Numerical simulations were used to determine the influence of width, breadth, and Rayleigh number on streamlines, isotherms, and Nusselt number. The results show that Nusselt number significantly increases with the increase in width, breadth, and Rayleigh number.
JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS
(2021)
Article
Engineering, Civil
Yuanyan Tang, Yi Hui, Ke Li
Summary: In this study, large eddy simulation (LES) is used to investigate the vortex-induced vibration (VIV) process of a rectangular cylinder with an aspect ratio of 4. The results show that the reattachment point of the separated shear layer moves upstream with increasing response amplitude. The characteristics of motion-induced wind loads at different wind speeds are also discussed.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Environmental Sciences
Xianrui Shi, Jia Dong, Genhua Yan, Chunyue Zhu
Summary: This study conducted experiments and analysis on the efficiency of the VIVACE device in low-velocity areas, investigating the factors affecting its performance and flow characteristics. By analyzing the impact of blockage ratio, Reynolds number, and aspect ratio on the flow field structure, new insights were provided for optimizing the VIVACE device.
Article
Optics
Huan Tang, Renxian Li, Shuhong Gong, Liu Yang, Lixia Yang, Bing Wei, Zitong Zhu, F. G. Mitri
Summary: By investigating the interaction between a dielectric circular cylinder rotating at a stable angular velocity and a plane wave, the curved photonic nanojet (CPNJ) phenomenon is studied. The optical Magnus effect of the dielectric circular cylinder is verified, and the analytical expressions for the internal and external electric fields are derived. The numerical results analyze the influence of size parameter, relative refractive index, and rotating dimensionless parameter on the CPNJ. The curved effect of the photonic nanojet is emphasized, which can be used for off-axis photonic nanojet (PNJ) generation by adjusting the angular velocity of the dielectric cylinder.
Article
Automation & Control Systems
Van-Binh Vu, Jose M. Gonzalez-Gonzalez, Volker Pickert, Mohamed Dahidah, Alicia Trivino
Summary: Electric vehicles (EVs) are gaining popularity due to their clean and efficient nature. Inductive charging as an alternative technology is receiving attention for its convenience and safety benefits. The proposed hybrid charger system aims to reduce component count and improve integration, with efficiency reaching 97.4% in conductive mode and 93.6% in inductive mode.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Multidisciplinary
Grzegorz Tytko
Summary: The paper introduces an eddy current system with an I-core sensor for testing conductive materials in cylinder shape, with analytical mathematical model developed using the TREE method. The Matlab implementation of the model provides a fast and effective program for determining sensor impedance, showing greater sensitivity compared to air-core sensors.
Article
Engineering, Mechanical
A. Mashhadi, A. Sohankar, Md Mahbub Alam
Summary: Numerical simulations were conducted to investigate unconfined flows over rectangular cylinders at different cross-sectional aspect ratios and Reynolds numbers. The study focused on the influence of the aspect ratio and Reynolds number on flow structure and aerodynamic parameters, identifying various flow separation and reattachment scenarios. The findings suggest that both aspect ratio and Reynolds number play a significant role in determining the flow characteristics.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mechanics
Yongliang Yang, Zhe Feng, Mengqi Zhang
Summary: This paper presents the results of numerical simulations and linear stability analyses on the flow past a cylinder. The effects of aspect ratios and Reynolds numbers on vortex shedding are investigated, and a new steady wake pattern is discovered.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Electrical & Electronic
Theodoros Theodoulidis, John R. Bowler
IEEE TRANSACTIONS ON MAGNETICS
(2015)
Article
Engineering, Electrical & Electronic
Tao Wu, John R. Bowler, Theodoros P. Theodoulidis
IEEE TRANSACTIONS ON MAGNETICS
(2017)
Article
Engineering, Electrical & Electronic
John Martinos, Theodoros Theodoulidis, Nikolaos Poulakis, Antonello Tamburrino
IEEE TRANSACTIONS ON MAGNETICS
(2014)
Article
Materials Science, Characterization & Testing
Roberto Miorelli, Christophe Reboud, Theodoros Theodoulidis, John Martinos, Nikolaos Poulakis, Dominique Lesselier
NDT & E INTERNATIONAL
(2014)
Article
Materials Science, Characterization & Testing
S. K. Burke, R. J. Ditchburn, T. P. Theodoulidis
NDT & E INTERNATIONAL
(2014)
Article
Multidisciplinary Sciences
Anastassios Skarlatos, Theodoros Theodoulidis
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2014)
Article
Engineering, Electrical & Electronic
Theodoros Theodoulidis
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
(2019)
Article
Multidisciplinary Sciences
Theodoros Theodoulidis, Anastassios Skarlatos
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2020)
Editorial Material
Multidisciplinary Sciences
Gui Yun Tian, Theodoros Theodoulidis
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2020)
Article
Engineering, Electrical & Electronic
Ruochen Huang, Mingyang Lu, Zhijie Zhang, Qian Zhao, Yuedong Xie, Yang Tao, Tian Meng, Anthony Peyton, Theodoros Theodoulidis, Wuliang Yin
IEEE SENSORS JOURNAL
(2020)
Article
Engineering, Electrical & Electronic
Anastassios Skarlatos, Theodoros Theodoulidis, Nikolaos Poulakis
Summary: In this study, the transient response of an induction coil above an infinite conducting plate is calculated using a combination of semi-analytical modal expansion approach and Euler integration scheme in the time domain. The derived state equation is equivalent to the Helmholtz equation with an imaginary frequency linked to the sampling rate, providing computational advantages compared to spectral methods. The time stepping schemes are found to be more robust than spectral approaches.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Engineering, Electrical & Electronic
Stavros P. Filippidis, Aggelos S. Bouhouras, Nikolaos Poulakis, Theodoros Theodoulidis, Georgios C. Christoforidis
Summary: This article provides a narrative and systematic review of the literature on electromagnetic optimization of superconducting solenoidal magnets and coils. It focuses on the evolution of techniques used to achieve field homogeneity, field intensity, stored energy, and secondary aspects. The review is organized in chronological order and categorized in tables based on the optimization targets. The article also discusses the existing literature gaps and the optimization techniques used in magnetic resonance imaging and superconducting magnetic energy storage devices, highlighting the less frequent use of modern techniques compared to older ones.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Proceedings Paper
Physics, Applied
Roberto Miorelli, Christophe Reboud, Theodoros Theodoulidis
40TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: INCORPORATING THE 10TH INTERNATIONAL CONFERENCE ON BARKHAUSEN NOISE AND MICROMAGNETIC TESTING, VOLS 33A & 33B
(2014)
Proceedings Paper
Materials Science, Characterization & Testing
Roberto Miorelli, Christophe Reboud, Dominique Lesselier, Nikolaos Poulakis, Theodoros Theodoulidis
ELECTROMAGNETIC NONDESTRUCTIVE EVALUATION (XVI)
(2014)
Proceedings Paper
Materials Science, Characterization & Testing
Anastassios Skarlatos, Theodoros Theodoulidis
ELECTROMAGNETIC NONDESTRUCTIVE EVALUATION (XVI)
(2014)
