Vortex Methods
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. DETERMINATION OF THE PESTICIDES IN WATER USED IN THE CULTURE AND PROCESSING OF POTATOES
The contamination of water bodies by pesticide residues through direct flow, leaching and other methods has motivated the development of analytical methods for the determination of these compounds in water. A vortex-assisted liquid-liquid microextraction method followed by gas chromatography coupled to mass spectrometry for the determination of anilazine, li
Quím. Nova. Publicado em: 2020-09
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2. Utilization of dynamic light scattering to evaluate Pterodon emarginatus oleoresin-based nanoemulsion formation by non-heating and solvent-free method
Abstract Pterodon emarginatus Vogel, Fabaceae, is a great source of bioactive compounds. The most known and studied herbal derivative from this species is an ambar-colored oleoresin that contains vouacapane diterpenes and volatile terpenoids, such as β-caryophyllene. Some recent papers aimed to generate nanoemulsions using this oleoresin for biological appl
Rev. bras. farmacogn.. Publicado em: 2017-06
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3. Aerodynamics of Harmonically Oscillating Aerofoil at Low Reynolds Number
ABSTRACT: Two-dimensional flows over harmonically oscillating symmetrical aerofoil at reduced frequency of 0.1 were investigated for a Reynolds number of 135,000, with focus on the unsteady aerodynamic forces, pressure and vortex dynamics at post-stall angles of attack. Numerical simulations using ANSYS® FLUENT CFD solver, validated by wind tunnel experimen
J. Aerosp. Technol. Manag.. Publicado em: 2017-03
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4. Numerical Simulation of the Wake Structure and Thrust/Lift Generation of a Pitching Airfoil at Low Reynolds Number Via an Immersed Boundary Method
ABSTRACT: In this study, an accurate computational algorithm in the context of immersed boundary methods is developed and used to analyze an incompressible flow around a pitching symmetric airfoil at Reynolds number (Re = 255). The boundary conditions are accurately implemented by an iterative procedure applied at each time step, and the pressure is also upd
J. Aerosp. Technol. Manag.. Publicado em: 2015-09
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5. Estudo numérico do escoamento ao redor de cilindros flexíveis. / Numerical investigation of flow around flexible cylinders.
Este trabalho aborda o escoamento ao redor de cilindros flexíveis com grande razão de aspecto, representando os riser utilizados na indústria petrolífera. O escoamento foi dividido em seções bidimensionais ao longo do comprimento do riser. O método dos vórtices discretos foi utilizado para estimativa dos coeficientes hidrodinâmicos nas seções corr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2011
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6. Estudo de VIM - Movimentos Induzidos por Vórtices em plataformas do tipo monocoluna: abordagem numérico-experimental e impactos no sistema de amarração. / VIM study - Vortex Induced Motions in monocolumn type platforms: numeric-experimental approach and impact on mooring system.
The vortex induced vibration VIV is a main subject studied in the offshore engineering, having its name adapted to VIM by the occurrence in Spar platforms in the Gulf of México. As the first monocolumn unit, the Sevan Piranema, was in Northeast Brazil in 2007, VIM occurrence in cylindrical units like this was questioned, having the mooring lines design dime
Publicado em: 2011
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7. Comparação e desenvolvimento de metodologias para o controle de qualidade de inoculantes / Comparison and development of methodologies for inoculants quality control
Inoculants containing N-fixer microorganisms generate huge economy for agricultural systems with nitrogen fertilization. In order to make inoculant products reach the market with the minimum attributes established in legislative determination, it is necessary to perform a good quality control. Therefore, this study aimed to compare methods of analysis of leg
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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8. Further developments in unsteady compressible vortex lattice method in two dimensional motion.
Unsteady phenomena like flutter, buffeting, rapid maneuvers in flight and gust entry are usually modeled and studied by a theoretical treatment involving potential flow methods. The resulting equation from this approach is the governing differential equation for general non-steady, non-viscous, potential flow known as convected wave equation. The disturbance
Publicado em: 2007
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9. Influência de vacâncias de spin na dinâmica de vórtices em sistemas magnéticos bidimensionais / Influence of spin vacancies in the vortex dynamics in two-dimensional magnetic systems
Neste trabalho estudamos a dinâmica de spins no modelo XY 2D clássico, incluindo impurezas não-magnéticas. Os resultados analíticos, testados por simulações, indicam duas formas de "aprisionar" um vórtice por meio de duas vacâncias de spin. Além disso, revelam uma interação efetiva do tipo atrativa entre estes defeitos. Analisamos também a funç
Publicado em: 2006
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10. On contribution of advanced vortex element methods toward virtual reality of unsteady vortical flows in the new generation of CFD
The purpose of this paper is to explain the attractive applicability of the advanced vortex element methods and their contribution to the beginning of the new generation of CFD, with introduction of epoch-making application of the methods to simulation of unsteady flows around bluff bodies and virtual operation of fluid machinery. The vortex methods have bee
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-12
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11. Cordas cosmicas e vortices em relatividade geral : pertubações radiais de soluções estaticas e estacionarias
A linearized theory of the dynamics of small perturbations of certain cylindrically symmetric systems in general relativity is presented. Firstly, we deal with straight, static cosmic strings of finite thickness in the U(l) gauge theory coupled to the Einstein equations. Taking into account the asymptotic behavior of the solution and certain integral ide
Publicado em: 1994
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12. Numerical vorticity creation based on impulse conservation.
The problem of creating solenoidal vortex elements to satisfy no-slip boundary conditions in Lagrangian numerical vortex methods is solved through the use of impulse elements at walls and their subsequent conversion to vortex loops. The algorithm is not uniquely defined, due to the gauge freedom in the definition of impulse; the numerically optimal choice of