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Littérature scientifique sur le sujet « Stream Convecting Vortex »

Auteur : Grafiati

Publié le 6 septembre 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Stream Convecting Vortex"

Garmann, D. J., and M. R. Visbal. "Interactions of a streamwise-oriented vortex with a finite wing." Journal of Fluid Mechanics 767 (February 24, 2015): 782–810. http://dx.doi.org/10.1017/jfm.2015.51.

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AbstractA canonical study is developed to investigate the unsteady interactions of a streamwise-oriented vortex impinging upon a finite surface using high-fidelity simulation. As a model problem, an analytically defined vortex superimposed on a free stream is convected towards an aspect-ratio-six ($\mathit{AR}=6$) plate oriented at an angle of ${\it\alpha}=4^{\circ }$ and Reynolds number of $\mathit{Re}=20\,000$ in order to characterize the unsteady modes of interaction resulting from different spanwise positions of the incoming vortex. Outboard, tip-aligned and inboard positioning are shown t

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Kislitsyn, S. A., and V. S. Berdnikov. "Numerical studies of the advective flow of heptadecane in a horizontal layer with a longitudinal temperature gradient at the lower boundary." Journal of Physics: Conference Series 2119, no. 1 (2021): 012085. http://dx.doi.org/10.1088/1742-6596/2119/1/012085.

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Abstract Numerical studies of the convective flow of heptadecane in a horizontal layer with a suddenly applied longitudinal temperature gradient at the lower high-thermal conductivity boundary have been carried out by the finite element method. A system of nonstationary dimensionless equations of free convection containing stream function, velocity vortex, and temperature as variables was solved. The calculations were carried out with a free upper boundary with and without taking into account the influence of the thermocapillary effect.

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Никулина, Светлана Анатольевна, Анатолий Викторович Перминов та Татьяна Петровна Любимова. "Конвективные режимы псевдопластической жидкости в квадратной полости при воздействии высокочастотных вибраций в условиях пониженной гравитации". Computational Continuum Mechanics 17, № 2 (2024): 202–18. http://dx.doi.org/10.7242/1999-6691/2024.17.2.19.

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In this paper, we investigate convective modes of pseudoplastic fluid in a square cavity with solid perfectly heat-conducting boundaries under reduced gravity. The cavity performs vertical linearly polarized high-frequency vibrations. Between the vertical walls of the cavity a temperature drop is prescribed in the direction perpendicular to vibrations and the field of gravity. The fluid rheology is described using the Williamson model. The problem is solved based on the averaged thermovibration convection equations for nonlinear viscous fluids. The vibration intensity is determined by the vibr

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Radomsky, R. W., and K. A. Thole. "High Free-Steam Turbulence Effects on Endwall Heat Transfer for a Gas Turbine Stator Vane." Journal of Turbomachinery 122, no. 4 (2000): 699–708. http://dx.doi.org/10.1115/1.1312807.

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High free-stream turbulence along a gas turbine airfoil and strong secondary flows along the endwall have both been reported to increase convective heat transfer significantly. This study superimposes high free-stream turbulence on the naturally occurring secondary flow vortices to determine the effects on the flowfield and the endwall convective heat transfer. Measured flowfield and heat transfer data were compared between low free-stream turbulence levels (0.6 percent) and combustor simulated turbulence levels (19.5 percent) that were generated using an active grid. These experiments were co

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Stechman, Daniel M., Robert M. Rauber, Greg M. McFarquhar, Brian F. Jewett, and David P. Jorgensen. "Interaction of an Upper-Tropospheric Jet with a Squall Line Originating along a Cold Frontal Boundary." Monthly Weather Review 144, no. 11 (2016): 4197–219. http://dx.doi.org/10.1175/mwr-d-16-0044.1.

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Abstract On 8 June 2003, an expansive squall line along a surface cold frontal boundary was sampled during the Bow Echo and Mesoscale Convective Vortex Experiment. The Naval Research Laboratory P-3 aircraft and the National Oceanic and Atmospheric Administration P-3 aircraft simultaneously sampled the leading and trailing edge of this squall line, respectively, with X-band Doppler radars. Data from these two airborne radar systems have been synthesized to produce a pseudo-quad-Doppler analysis of the squall line, yielding a detailed three-dimensional kinematic analysis of its structure. A simu

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Berg, Elizabeth M., Louis J. Urtecho, Siddharth Krishnamoorthy, Elizabeth A. Silber, Andrew Sparks, and Daniel C. Bowman. "An Accurate and Automated Convective Vortex Detection Method for Long-Duration Infrasound Microbarometer Data." Journal of Atmospheric and Oceanic Technology 41, no. 3 (2024): 341–54. http://dx.doi.org/10.1175/jtech-d-23-0037.1.

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Abstract Heating of the surficial layer of the atmosphere often generates convective vortices, known as “dust devils” when they entrain visible debris. Convective vortices are common on both Earth and Mars, where they affect the climate via dust loading, contribute to wind erosion, impact the efficiency of photovoltaic systems, and potentially result in injury and property damage. However, long-duration terrestrial convective vortex activity records are rare. We have developed a high-precision and high-recall method to extract convective vortex signatures from infrasound microbarometer data st

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Kumar, Bhaskar, and Sanjay Mittal. "On the origin of the secondary vortex street." Journal of Fluid Mechanics 711 (September 24, 2012): 641–66. http://dx.doi.org/10.1017/jfm.2012.421.

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AbstractThe origin of the secondary vortex street, observed in the far wake in the flow past a circular cylinder, is investigated. The Reynolds number, based on the diameter of the cylinder, is 150. The von Kármán vortex street, which originates in the near wake, decays exponentially downstream of the cylinder. Beyond the region of decay, a broad band of frequencies are selectively amplified, leading to the formation of a secondary vortex street consisting of packets of large-scale vortex structures. The streamwise location of the onset of the instability, frequency of the generation of packet

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G, Krishna Veni, Satyanarayana Chirala, and Chenna Krishnareddy M. "Radial Basis Function Based Partition of Unity Method for Two-Dimensional Unsteady Convection Diffusion Equations." Indian Journal of Science and Technology 16, no. 27 (2023): 2090–101. https://doi.org/10.17485/IJST/v16i27.336.

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Abstract Objective: The present method aims to solve and investigate the efficiency, accuracy, and stability of the 2D unsteady Navier-Stokes equation in stream function vorticity formulation and Taylor’s vortex problem. Method: RBF partition of unity method (RBF-PUM) was implemented to solve the twodimensional Navier- Stokes equations in stream function vorticity formulation and Taylor’s vortex problem. Findings: RBF-PUM results show good agreement with the exact solutions. The numerical approach is found

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Chang, Keun-Shik, and Jong-Youb Sa. "The effect of buoyancy on vortex shedding in the near wake of a circular cylinder." Journal of Fluid Mechanics 220 (November 1990): 253–66. http://dx.doi.org/10.1017/s002211209000324x.

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The phenomenon of vortex shedding from a heated/cooled circular cylinder has been investigated numerically in the mixed natural and forced convection regimes. Accuracy of the computation was achieved by the fourth-order Hermitian relation applied to the contravariant velocity components in the convection terms of the vorticity transport equation, and by the far-boundary stream-function condition of an integral-series form developed by the authors. Purely periodic flows at Re = 100, efficiently established through the use of a direct elliptic solver called the SEVP, was found to degenerate into

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Moharreri, S. S., B. F. Armaly, and T. S. Chen. "Measurements in the Transition Vortex Flow Regime of Mixed Convection Above a Horizontal Heated Plate." Journal of Heat Transfer 110, no. 2 (1988): 358–65. http://dx.doi.org/10.1115/1.3250492.

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Experimental results covering the transition vortex flow regime of mixed convection over a heated, horizontal flat plate are presented. A criterion for the onset of vortex instability as a function of critical Reynolds and Grashof numbers was established with the aid of a flow visualization technique. The three-dimensional nature of this flow regime was documented through both velocity and temperature measurements using laser-Doppler and hot/cold-wire anemometers, respectively. A higher buoyancy force, through a higher plate temperature or a larger downstream distance, and/or a lower free-stre

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Thèses sur le sujet "Stream Convecting Vortex"

Olley, Peter, Timothy D. Gough, R. Spares, and Philip D. Coates. "An experimental and simulation comparison of a 3-D abrupt contraction flow using the Molecular Stress Function constitutive model." Maney Publishing, 2020. http://hdl.handle.net/10454/18042.

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Yes The Molecular Stress Function (MSF) constitutive model with convective constraint release mechanism has been shown to accurately fit a large range of viscometric data, and also shown to give strong vortex growth in flows of LDPE through planar and axisymmetric contractions. This work compares simulation and experimental results for 3-D flows of Lupolen 1840H LDPE through a contraction slit; 3-D effects are introduced by using a slit with a low upstream aspect ratio of 5:3. Comparisons are made with vortex opening angles obtained from streak photography, and also with stress birefringe

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Dumouchel, Fabien. "Etude expérimentale des champs dynamiques et thermiques de l'écoulement de Benard-Von Karman en aval d'un obstacle chauffé dans l'air et dans l'eau." Rouen, 1997. http://www.theses.fr/1997ROUES067.

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Cette thèse a pour objet l'étude expérimentale de l'écoulement en aval d'un obstacle chauffé ou non (cylindre circulaire ou ruban) dans une gamme de nombres de Reynolds où le sillage 2D-périodique est caractérisé par l'existence d'une allée de Benard-Von Karman. Cette étude a été entreprise dans l'air et dans l'eau, en utilisant l'ADL pour la mesure des vitesses et la thermométrie à fil froid ou à thermocouple à fil fin pour la mesure des températures. Des études antérieures ont montré que ce type d'écoulement était très sensible au chauffage de l'obstacle, conduisant à une stabilisation dans

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Vinod, Kumar B. G. "Co-operative Destabilization of a Flat Plate Boundary Layer by a Free Stream Convecting Vortex and Wall Suction/Blowing." Thesis, 2007. https://etd.iisc.ac.in/handle/2005/4627.

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The stability of wall bounded shear layer at subcritical Reynolds number disturbed by a freestream convecting vortex and unsteady suction/blowing at the wall was studied. A counterclockwise line vortex was convected parallel to the plate in the direction of the free-stream, slower than the free-stream velocity and well outside the boundary layer. Simultaneously, unsteady periodic suction/blowing of the identical uid was introduced near the leading edge on the plate through a narrow slit. The incompressible unsteady problem was modelled using the vorticity stream function formulation with appro

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Livres sur le sujet "Stream Convecting Vortex"

Kolmičkovs, Antons. Electric Field Effect on Combustion of Pelletized Biomass in Swirling Flow. RTU Press, 2022. http://dx.doi.org/10.7250/9789934227257.

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The Doctoral Thesis examines the control of the swirling flame flow dynamics with an external static electric field by firing the gaseous products of thermal decomposition of pelletized straw, woody biomass, and peat with the aim of more efficient heat production with a decrease of flue gas emissions. The intensification of the downward vortex in the electric field has been determined, ensuring improved mixing of the air vortex with the biomass thermal decomposition gas flow, intensifying the convective mass transfer towards the heating surfaces, and increasing the amount of heat energy produc

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Chapitres de livres sur le sujet "Stream Convecting Vortex"

Kennel, Charles F. "The Viscous Magnetosphere." In Convection and Substorms. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195085297.003.0007.

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This chapter describes how the magnetosphere is shaped by the tangential shear stress exerted at the magnetopause by collisionless viscosity. In Section 4.2, we discuss the low-latitude boundary layer (LLBL), which contains plasma of solar wind origin that has been transported across the magnetopause current layer. The velocity shear in the LLBL drives field-aligned currents into the ionosphere on the morning side and out of the ionosphere on the evening side (Section 4.3). These currents are of the appropriate sense to drive two-cell convection in the highlatitude ionosphere. The footprint of

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Actes de conférences sur le sujet "Stream Convecting Vortex"

Rosenzweig, Marco, Melissa Kozul, and Richard D. Sandberg. "Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied via High-Fidelity Simulation." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-125408.

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Abstract High-fidelity simulations are used to conduct controlled numerical experiments to investigate the effect of periodically incoming wakes on profile and three-dimensional loss mechanisms. The present work considers the MTU-T161 cascade with spanwise-diverging end-walls, representative of a high-lift, low-pressure turbine blade. All simulations are carried out at engine-relevant conditions, with exit Reynolds number of 90,000 and exit Mach number of 0.6. Upstream moving bars are used to generate incoming wakes which impinge on the blade and potentially alter its aerodynamic performance.

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Baranyi, La´szlo´. "Forced Convection From a Stationary Cylinder Placed in a Uniform Stream." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45620.

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A finite difference solution is presented for 2D laminar unsteady flow around and forced convection from a stationary cylinder placed in an otherwise uniform flow. The fluid is assumed to be incompressible and of constant property. The temperature of the cylinder wall is kept constant, and the viscous energy dissipation term is neglected in the energy equation. The computed Strouhal numbers, time-mean drag and base pressure coefficients, as well as the average Nusselt numbers compare well with existing experimental results. The distribution of the local Nusselt number on the cylinder was inves

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Martynenko, Alex, Ivanna Bashkir, and Tadeusz Kudra. "Electrically enhanced drying of white champignons." In 21st International Drying Symposium. Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7318.

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Effects of convective cross-flow of air in electrohydrodynamic (EHD) drying on drying rate of 5 mm slices of champignons have been investigated. Electro-convection issued from discharge electrode (42 needles arranged into 6×7 rows with 2×2 cm spacing, 18 kV DC voltage and 3.5 cm gap) provided average ionic wind velocity of 1.0 m/s flowing perpendicularly to the surface of champignons slices, while forced air stream at atmospheric pressure 1000 kPa, superficial velocity 1.0 m/s, temperature 22-24°C, and relative humidity 25-40%, was blown parallel to the surface of champignons slices. To study

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Juniper, Matthew P. "Absolute and Convective Instability in Gas Turbine Fuel Injectors." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68253.

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Hydrodynamic instabilities in gas turbine fuel injectors help to mix the fuel and air but can sometimes lock into acoustic oscillations and contribute to thermoacoustic instability. This paper describes a linear stability analysis that predicts the frequencies and strengths of hydrodynamic instabilities and identifies the regions of the flow that cause them. It distinguishes between convective instabilities, which grow in time but are convected away by the flow, and absolute instabilities, which grow in time without being convected away. Convectively unstable flows amplify external perturbatio

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Manca, O., S. Nardini, D. Ricci, and S. Tamburrino. "A Numerical Investigation on Nanofluid Laminar Mixed Convection in Confined Impinging Jets." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65915.

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In this paper a numerical investigation on confined impinging slot jets working with a mixture of water and Al2O3 nanoparticles is described. The flow is laminar and a constant temperature is applied on the target surface. A single-phase model approach has been adopted because the particle concentrations are low. Different geometric ratios and nanoparticle volume concentrations have been considered at different Richardson numbers in order to take into account also the buoyancy effects. The aim consists into study the behaviour of the system by means of average and local Nusselt number, convect

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Molki, Majid. "Heat Transfer From a Short Cylinder Situated Parallel to an Air Stream." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-73293.

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Abstract This work presents heat transfer for isothermal cylinders situated parallel to a uniform flow, and it compares the local and average heat transfer coefficients to several experimental data. The computations consider air as the working fluid, but the paper proposes an extension of correlations to other fluids. In this study, the cylinder length-to-diameter ratio is equal to one, and the flow Reynolds number ranges from 5000 to 42,000. The results show that the convective heat transfer coefficient for the cylinder’s front face increases radially outward in agreement with the available e

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Dalton, Charles, and Wu Zheng. "Numerical Solutions of a Viscous Uniform Approach Flow Past Square and Diamond Cylinders." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32287.

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Numerical results are presented for a uniform approach flow past square and diamond cylinders, with and without rounded corners, at Reynolds numbers of 250 and 1000. This unsteady viscous flow problem is formulated by the 2-D Navier-Stokes equations in vorticity and stream-function form on body-fitted coordinates and solved by a finite-difference method. Second-order Adams-Bashforth and central-difference schemes are used to discretize the vorticity transport equation while a third-order upwinding scheme is incorporated to represent the nonlinear convective terms. A grid generation technique i

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Saeidi, S. M., and J. M. Khodadadi. "Flow Field and Heat Transfer in a Cavity With Inlet and Outlet Ports Due to Incoming Flow Oscillation." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72677.

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A finite-volume-based computational study of transient laminar flow and heat transfer (neglecting natural convection) within a square cavity with inlet and outlet ports due to an oscillating velocity at the inlet port is presented. The inlet port is placed at the top of the left wall and the outlet port is positioned at the bottom of the right wall of the cavity. The inlet velocity varies sinusoidally with time for a range of dimensionless frequencies (St = 0.1, 0.5, 1, 2 and 10). The instantaneous Reynolds number also varies sinusoidally between 100 and 500 and Pr = 5. It takes more cycles fo

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Chen, Chin-Lung, and Chin-Hsiang Cheng. "Natural Convection Heat Transfer and Flow Pattern in an Inclined Arc-Shape Enclosure." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/htd-24122.

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Abstract Numerical and experimental investigations have been conducted to study the flow and heat transfer characteristics for the buoyancy-induced flow inside an inclined arc-shape enclosure. Mathematical model in form of a stream function-vorticity formulation representing the laws of conservation in mass, momentum, and energy is expressed in a curvilinear coordinate frame and solved by a finite-volume discretization method. Heat transfer and flow pattern are predicted at various Grashof numbers and inclination angles. Meanwhile, an experimental system is developed and a flow-visualization t

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Bencs, Pe´ter, Szila´rd Szabo´, Ro´bert Borda´s, Katharina Za¨hringer, and Dominique The´venin. "Simultaneous Measurement of Velocity and Temperature Downstream of a Heated Cylinder." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57789.

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Bluff bodies placed in a flow, such as electrical transmission lines, cartridge heaters, pipes of heat exchangers, factory chimneys and so on, often have a different temperature compared to that of the surroundings. The structure of the flow developing around bluff bodies has been investigated for a long time (Adrian, 1991; Williamson, 1996). The Ka´rma´n vortex street was and is examined by numerous researchers, both experimentally and numerically. Nevertheless, the question arises as to how this vortex street is modified by a heated cylindrical bluff body. What is the influence of heating on

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