Results 271 to 280 of about 219,945 (319)

High-dimensional multiplexing through vortex electromagnetic wave manipulation by space-time-coding metasurfaces. [PDF]

Light Sci Appl
Yang C, Wang SR, Du JC, Wang MT, Wang ZX, Chan KF, Zheng DZ, Wu GB.   +7 more
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Modelling vortex-vortex and vortex-boundary interaction

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Caustics of the vortex beams generated by vortex lenses and vortex axicons

Journal of the Optical Society of America A, 2020
In this work, the propagation of vortex beams is treated using a catastrophe theory approach. Analytic expressions are deduced to describe caustic surfaces produced by vortex lenses and vortex axicons. The obtained analytics allow us to explain the formation of the shadow region along the optical axis for vortex beams using ...
Sergey I. Kharitonov, Svetlana N. Khonina, Sergey G. Volotovskiy, Nikolay L. Kazanskiy   +3 more
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Experimental Dynamics of a Vortex within a Vortex

Physical Review Letters, 2000
We report the experimental dynamics of a new two-dimensional (2D) fluid phenomenon that occurs when an intense, pointlike vortex is placed within a diffuse, circular vortex. Our observations, made using strongly magnetized electron columns to model the 2D fluid, support the analysis performed by Jin and Dubin.
D, Durkin, J, Fajans
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Convergence of the Vortex Method for Vortex Sheets

SIAM Journal on Numerical Analysis, 1989
Summary: Computation of the evolution of vortex sheets is delicate because of Kelvin-Helmholtz instability and singularity formation (infinite curvature). Convergence of the point vortex method and the vortex blob method is demonstrated for vortex sheets with both spatial and temporal discretization and with simulated roundoff error.
Caflisch, Russel E., Lowengrub, John S.
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Interaction of a vortex ring with a piston vortex

Journal of Fluid Mechanics, 2002
Recent studies on vortex ring generation, e.g. Rosenfeld et al. (1998), have highlighted the subtle effect of generation geometry on the final properties of rings. Experimental generation of vortex rings often involves moving a piston through a tube, resulting in a vortex ring being generated at the tube exit.
Allen, J. J., Auvity, B.
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Vortex Effect, Vortex Power

2018
One of the non-traditional types of renewable energy is vortex energy, which arises when swirling flows of continuous media (e.g., liquid and gas) are formed and which can be converted into thermal energy, work, and also used to raise the temperature in some systems or to create a pressure gradient.
Serebryakov Rudolf, Vladimir Vasilyevich Biryuk, Vyacheslav Volov   +2 more
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Vortex configuration and vortex–vortex interaction in nano-structured superconductors

Physica C: Superconductivity, 2012
Abstract We study the vortex structures and quasi-particle structures in nano-structured superconductors. We used the Bogoliubov–de Gennes equation and the finite element method and obtained stable magnetic flux structures and the quasi-particle states.
Masaru Kato, Yuhei Niwa, Hisataka Suematsu, Takekazu Ishida   +3 more
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Effects of Vortex-Vortex Interaction in a Compressor Cascade With Vortex Generators

Volume 2A: Turbomachinery, 2015
This paper presents a numerical investigation to explore the effects of vortex generators on a high speed compressor cascade. Secondary flow effects like the corner separation vortex have an influence on the performance of a compressor cascade such as leading to increased losses.
Tan Zheng, Xiaoqing Qiang, Jinfang Teng
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Flame–vortex interaction in a reacting vortex ring

Physics of Fluids, 1998
Direct numerical simulations are used to study the flame–vortex interaction in a laminar reacting vortex ring. The chemical reaction occurs by a one-step, Arrhenius-type reaction that mimics the combustion of typical hydrocarbon and air. The ring is generated by an axisymmetric jet that is impulsed to emit a cold fuel through a nozzle.
Hewett, J. S., Madina, C. K.
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