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... Lyons & Company Limited, International Chemical & Petroleum Engineering Exhibition, Vortice, Carbon Electric Holdings Ltd, Advance-Peterholm Group Limited, ...
1966 - Gale Group | TDA
Xiaodong Chen, Shan Zhong, Özgün Özer, Andrew Weightman, Guangjun Gao,
... sweeping jet was applied to control the afterbody vortices behind a 30° slanted-base cylinder at a ... process between the sweeping jet and the afterbody vortices have been obtained for the first time. It ... intensity of this interaction decreases as the afterbody vortices become detached from the base. Nevertheless, the sweeping jet continues invading the afterbody vortices from their inner side and pushes its way outwards from the underside of the afterbody vortices causing them to weaken further. Furthermore, the interaction ...
Tópico(s): Fluid Dynamics and Turbulent Flows
2023 - American Institute of Physics | Physics of Fluids
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... WP Warwick Parker & Co Ltd A Sales Career Vortice John MacKenzie Chairman and Chief Executive… EMC2 Allders ...
1995 - Gale Group | TDA
Xiaodong Chen, Shan Zhong, Özgün Özer, Andrew Weightman,
... sweeping jet is applied to control the afterbody vortices behind a slanted-base cylinder for the first ... jet results in increasingly diffused and larger afterbody vortices as Cμ increases. While an increase in Cμ ... a reduction in the circulation of the afterbody vortices and their earlier detachment from the slanted base, ... in Cμ introduces additional vorticity into the afterbody vortices leading to higher vortex strength, which could be ... in that turbulence is injected into the afterbody vortices as the sweeping jet intersects with these vortices ...
Tópico(s): Wind and Air Flow Studies
2022 - American Institute of Physics | Physics of Fluids
Ge Han, Chengwu Yang, Shixun Wu, Shengfeng Zhao, Xingen Lu,
... However, the special leading edge could generate pair vortices and it is not clear if the pair vortices have positive or negative effect on pipe diffuser performance. Besides, the generation and development of pair vortices are also need to be investigated. This work is aimed at uncovering the influence of vortices on aerodynamic loss in pipe diffuser. Pipe diffusers ... gas turbine. The generation and evolution of pair vortices in pipe diffuser passages are studied by validated ... of the influence of different geometries on pair vortices and pipe diffuser performance are provided. Through these ...
Tópico(s): Aerodynamics and Acoustics in Jet Flows
2022 - Elsevier BV | Applied Thermal Engineering
Xin Wang, Zhanqiang Liu, Bing Wang, Yukui Cai, Yi Wan,
With significant centrifugal effects and Dean vortices, the spiral microchannels are being widely used in microfluidic systems, especially for high-efficiency mixing. However, the spirals are with various shapes ... whole flow path which brought about stronger Dean vortices. Moreover, it was found that Dean vortices was inapplicable to characterize chaotic advection in the centrosymmetric spiral structure due to vortices degradation. Vortices degradation resulted from the counter-rotating Dean vortices, ...
Tópico(s): Heat Transfer and Optimization
2021 - Elsevier BV | International Journal of Heat and Mass Transfer
... of 60–180. Five kinds of near-wall vortices are identified with the presence of rectangular ribs, including quasi-stagnation vortices, subordinate vortices, inter-rib vortices, inter-rib quasi-stagnation vortices, and dynamic inter-rib vortices. These near-wall vortices and their evolution are sensitive to Re as ... Re and the evolution of dynamic inter-rib vortices. The hydrodynamic coefficients and vortex shedding frequency are ... associated with the appearance and number of subordinate vortices. In addition, the fluctuation of W* is mainly ...
Tópico(s): Wind and Air Flow Studies
2021 - American Institute of Physics | Physics of Fluids
Xiaocheng Zhu, Chong Sun, Hua Ouyang, Zhaohui Du,
... the time-varying wake flow. There are tip vortices, hub vortices, and blade and tower shedding vortices active in the near wake. Dynamic mode decomposition ( ... frame illustrate the downstream motion of the tip vortices. In the relative frame, the results indicate that ... finally lead to a breakdown of the tip vortices in the case without a nacelle and tower. ... effect of the nacelle and tower, the shedding vortices of the nacelle and tower directly break the tip vortices. The interaction between the tip vortices and the ...
Tópico(s): Fluid Dynamics and Vibration Analysis
2021 - Elsevier BV | Energy
We find chiral non-Abelian vortices having windings only in one of the diquark condensations of left-handed and right-handed quarks in the color-flavor locked phase of dense QCD. They are the minimum vortices carrying half color magnetic fluxes of those of non-Abelian semisuperfluid vortices (color magnetic flux tubes) and $1/6$ quantized superfluid circulations of Abelian superfluid vortices. These vortices carry $\mathbb{C}{P}^{2}$ orientational moduli in ... P}^{2}$ moduli of two chiral non-Abelian vortices with chiralities opposite to each other are energetically ...
Tópico(s): Quantum, superfluid, helium dynamics
2021 - American Physical Society | Physical review. D/Physical review. D.
Han Li, Qiaogao Huang, Guang Pan, Xinguo Dong,
... inspected. To further examine the evolution of the vortices, as well as their interaction and destabilization, the ... then accelerates under the effects of duct shed vortices, which promote the generation of secondary vortices. The secondary vortices further enhance the destabilization process and lead to chaotic evolution. The stator blade root vortices are strongly affected by the rotor blade root vortices, causing an exchange of vorticity that depends on ... relative intensity of the two sets of root vortices. The instability of the hub vortices is apparently ...
Tópico(s): Computational Fluid Dynamics and Aerodynamics
2021 - American Institute of Physics | Physics of Fluids
Chao Wang, Peng Li, Chunyu Guo, Lianzhou Wang, Shuai Sun,
... used to analyse propeller wake, including the tip vortices of endplate, secondary tip vortices, merged and trailing sheet vortices and the hub vortex. Based on previous works, ... the instabilities in CLT propeller wake. The merged vortices formed by merging between the tip vortices of endplate and the secondary tip vortices are strengthened, stretched by the outer trailing vortices that are caused by the crack of trailing sheet vortices, then the reinforced merged vortices trigger the leapfrogging ...
Tópico(s): Hydraulic and Pneumatic Systems
2021 - Elsevier BV | Ocean Engineering
Solutions of robust axisymmetric neutral vortices, that is, vortices with zero amount of vorticity, in two-dimensional (2D) Euler flows with distributed vorticity are obtained. These solutions ... robust to small amplitude vorticity perturbations. These neutral vortices are quiescent and remain steady in the presence of similar vortices. Other linear combinations of these vorticity layer-modes give rise to unstable neutral vortices that develop into neutral tripoles, pentapoles, etc. It ... found numerically that the robustness of these neutral vortices is related to the spiralization and axisymmetrization of ...
Tópico(s): Fluid Dynamics and Vibration Analysis
2021 - American Institute of Physics | Physics of Fluids
... characteristics, and cyclogenesis efficiency (CE) of synoptic-scale vortices initiated over West Africa and the Atlantic Ocean. Vortices initiated over the ocean at a given pressure ... over West Africa. Low-level (850 hPa) primary vortices are initiated mainly in July near the Hoggar ... N, 5°E), while midlevel (700 hPa) primary vortices are initiated mainly in August–September near the ... N, 10°W). The CE of all these vortices is about 10% in July and 30% in ... CE is, however, smaller for low-level “Hoggar” vortices because they peak in July when the cyclogenesis ...
Tópico(s): Ocean Waves and Remote Sensing
2020 - American Meteorological Society | Monthly Weather Review
Suyang Qin, Zifeng Weng, Zhuoqi Li, Yang Xiang, Hong Liu,
The reduction of wingtip vortices is a critical and challenging task for aircraft wing-design. Inspired by the wingtip morphology of soaring birds, Whitcomb created ... motion could potentially affect the evolution of tip vortices, which has been rarely investigated. To explore the control mechanisms of wingtip vortices by flapping, a flapping wing model with two- ... geese's flapping motion. The evolution of tip vortices was recorded in a wind tunnel using particle ... features were analyzed. It is shown that wingtip vortices change the vorticity concentration and vortex radius as ...
Tópico(s): Fluid Dynamics and Vibration Analysis
2020 - Elsevier BV | Aerospace Science and Technology
Chihiro Matsuoka, Katsunobu Nishihara, F. Cobos Campos,
... two fluids, the Richtmyer–Meshkov instability (RMI) occurs. Vortices are generated in bulk behind the transmitted and ... the shock intensity becomes larger, the stronger bulk vortices are created. The nonlinear evolution of RMI is ... the nonlinear interaction between the interface and the vortices into account. The fluid becomes incompressible as the ... applied. The vorticity and position of the bulk vortices obtained from the compressible linear theory [F. Cobos- ... applied as initial conditions of the bulk point vortices in VSM. The suppression of RMI due to ...
Tópico(s): Computational Fluid Dynamics and Aerodynamics
2020 - American Institute of Physics | Physics of Plasmas
Enhui Liu, Xiao Liu, Majie Zhao, Hongtao Zheng, Jinghe Lu, Zhihao Zhang,
... study aims to explore the formation mechanism of vortices such as the hairpin vortices, hovering vortices and horseshoe vortices, the relationship between the fuel–air mixing and ... of velocity. For R = 4, the shear layer vortices, horseshoe vortices, counter-rotating vortices pairs (CVP) and wake vortices can be observed, while the jet shear layer ... be observed for R = 1.5. The hairpin vortices originating from the vortice-ring are lifted and shed from the downstream ...
Tópico(s): Fluid Dynamics and Turbulent Flows
2020 - Elsevier BV | International Journal of Heat and Fluid Flow
Moritz Mauz, Alexander Rautenberg, Andreas Platis, Marion Cormier, Jens Bange,
Abstract. In the present study, blade-tip vortices have been experimentally identified in the wake of a commercial wind turbine using the Multi-purpose Airborne Sensor Carrier Mark 3 (MASC Mk ... evaluation of the wind components, detached blade-tip vortices were identified in the time series. From these ... radius of a pair of detached blade-tip vortices is calculated using the Burnham–Hallock (BH) wake ... Sea coastline with northern wind direction. The measured vortices are also compared to the analytical solution of ...
Tópico(s): Aerodynamics and Fluid Dynamics Research
2019 - Copernicus Publications | Wind energy science
... the detection and dynamics of large scale mesoscale vortices both in horizontal and vertical planes by using ... in the Baltic Sea. In the horizontal plane, vortices with typical length and velocity scale of 5– ... clear periodicity of one to seven days. The vortices rotate both in clockwise and anti-clockwise directions. ... the same range. The maximum numbers of mesoscale vortices are within the 15-m thick surface layer ... layer is characterized by a set of distinct vortices. Taylor-Gortler type vortices appear within the surface ...
Tópico(s): Tropical and Extratropical Cyclones Research
2019 - Elsevier BV | Dynamics of Atmospheres and Oceans
The dynamics of quantized vortices in two-dimensional two-component miscible Bose-Einstein condensates trapped by a box potential has been numerically studied using the ... model. We have discovered a phenomenon where the vortices of the two components spatially separate from each ... call the phase separation of the distribution of vortices. This phase separation occurs when the intercomponent coupling is strong. Onsager vortices, on the other hand, are formed in both ... intercomponent coupling is weak. We distinguish between Onsager vortices and phase-separated vortices by two types of ...
Tópico(s): Strong Light-Matter Interactions
2019 - American Physical Society | Physical review. A/Physical review, A
... m$ three-dimensional, unit-Burger-number, quasi-geostrophic vortices in mutual equilibrium whose centroids lie on a horizontal circular ring; or $m+1$ vortices where the additional vortex lies on the vertical ‘ ... In the first category, the $m$ identical point vortices are equally spaced on a circular ring and ... We next turn our attention to finite-volume vortices for the same three categories. The vortices consist of finite volumes of uniform potential vorticity, ... an (imposed) $m$ -fold symmetry. For simplicity, all vortices have the same volume and the same potential ...
Tópico(s): Tropical and Extratropical Cyclones Research
2019 - Cambridge University Press | Journal of Fluid Mechanics
Xinxin Fang, Chibing Shen, Mingbo Sun, Richard D. Sandberg, Peng Wang,
Large-scale vortices downstream of a lobed mixer are investigated experimentally using a nanoparticle-based planar laser scattering experimental system. The ... flat plate and a convoluted plate. Three streamwise vortices form downstream of the lobed mixer due to ... downstream. Comparison of vortex sizes indicates that streamwise vortices contribute almost 80% of mixing enhancement, which is ... also quite different from the effects of streamwise vortices on the mixing enhancement in incompressible mixing layers. ...
Tópico(s): Aerodynamics and Acoustics in Jet Flows
2019 - American Institute of Physics | Physics of Fluids
... the generation mechanism of a hierarchy of multiscale vortices in a high-Reynolds-number turbulent boundary layer, ... direct numerical simulations and educe the hierarchy of vortices by applying a coarse-graining method to the ... obey the $-5/3$ power law, small-scale vortices, that is, vortices sufficiently smaller than the height from the wall, ... contributes most to the stretching of smaller-scale vortices. This generation mechanism of small-scale vortices is similar to the one observed in fully ... energy cascade. On the other hand, large-scale vortices, that is, vortices as large as the height, ...
Tópico(s): Fluid Dynamics and Vibration Analysis
2019 - Cambridge University Press | Journal of Fluid Mechanics
Xiaoyu Ma, C. Reichhardt, C. Reichhardt,
We numerically examine the manipulation of superconducting vortices interacting with a moving trap representing a magnetic force tip translating across a superconducting sample containing a periodic array of pinning sites. As ... dynamic phases, including a decoupled regime where the vortices are dragged a short distance within a pinning site, an intermediate coupling regime where vortices in neighboring pinning sites exchange places, an intermediate trapping regime where individual vortices are dragged longer distances and exchange modes of ...
Tópico(s): Mechanical and Optical Resonators
2018 - American Physical Society | Physical review. B./Physical review. B