Vorticity
Mostrando 13-24 de 61 artigos, teses e dissertações.
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13. Studies using wind tunnel to simulate the Atmospheric Boundary Layer at the Alcântara Space Center
Abstract: The Alcântara Space Center (ASC) region has a peculiar topography due to the existence of a Coastal cliff, which modifies the atmospheric boundary layer characteristic in a way that can affect rocket launching operations. Wind tunnel measurements can be an important tool for the understanding of turbulence and wind flow pattern characteristics in
J. Aerosp. Technol. Manag.. Publicado em: 2009-06
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14. Barotropic instability process of Brazil current at Santos Basin / Processos de instabilidade barotrópica da Corrente do Brasil na Bacia de Santos
The Brazil Current (BC) is formed at the bifurcation of the southern branch of the South Equatorial Current and flows south-southeastward off the east, southeast and southern Brazilian continental margin, exhibiting intense meso-scale activity between the Vitória-Trindade Ridge (20oS) and Cape Santa Marta Grande (28oS). The knowledge of such activity, built
Publicado em: 2009
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15. Caracterização física e dinâmica de episódios de chuvas intensas nas regiões sul e sudeste do Brasil / Physical and dynamical characteristics of heavy rainfall episodes in southern and southeastern Brazil
The heavy rainfall events occurred in Southern and Southeastern Brazil between 1960 and 2004 are investigated. It is observed positive trends in the annual frequency of these events in both regions in this period of 45 years. The trend in Southern Brazil is more significant. The atmospheric environments associated with these events also are investigated, but
Publicado em: 2009
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16. Objective method identification upper-tropospheric cyclonic vortices in the South Tropical region: validation and climatology / Método objetivo de identificação dos vórtices ciclônicos de altos níveis na região tropical sul: validação e climatologia
An Objective Method (OM) to identify Upper-Tropospheric Cyclonic Vortex (UTCV) in South Tropical region was developed based on relative vorticity and on horizontal flow of the wind round the centre of the system. As this synoptic system shows an irregular movement the weather forecasts become complex. The interannual and intrasazonal variability study of the
Publicado em: 2008
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17. Resposta da Plataforma Continental Sudeste a ventos sazonais e sinóticos de verão: estudos numéricos / Response of the South Brazil bight to summer seasonal and synoptic winds: numerical studie
In order to study the pertubations caused on the South Brazil Bigth (SBB) caused by the passage of a cold front during Summer, a mean basic state for currents was obtained using the POM (Princeton Ocean Model) through diagnostic simulation, followed by a short round prognostic. The mean currents modeled are in certain instancies similar to the currents measu
Publicado em: 2008
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18. DinÃmica de VÃrtices pontuais na esfera S2 e no espaÃo hiperbÃlico
We present the movement equations of n punctual vortices over the following Riemann surfaces: the sphere S2 and the hyperbolic space H2. We also state the Hamiltonian formulation of the vortices motion over these surfaces. For this purpose, we primarily present the stereographic projection over S2 and over H2. Then, we construct the Laplace-Beltrami operator
Publicado em: 2008
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19. Regime não-linear de trens de ondas modulados na direção transversal em um escoamento de Poiseuille plano / The nonlinear regime of spanwise modulated wavetrains in a plane Poiseuille flow
The current thesis had three objectives. The first objective was to develop a code of direct numerical simulation (DNS) to simulation of waves of instability in a plane Poiseuille flow. The other main objective was to analyze it through the method of manufactured solutions (MMS). Finally, a third objective was to study the nonlinear regime of spanwise modula
Publicado em: 2008
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20. Numerical simulation of two-dimensional complex flows around bluff bodies using the immersed boundary method
This paper presents a two-dimensional numerical simulation of flows around different bluff bodies, at Re = 100 and 200, using the Immersed Boundary (IB) method, as a sequence of a previous work. The force density term required by the IB method is obtained with the Virtual Physical Model (VPM). Simulations were carried out for two circular cylinders of differ
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-12
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21. The carreau-yasuda fluids: a skin friction equation for turbulent flow in pipes and kolmogorov dissipative scales
In this work the turbulent flow of the Non-Newtonian Carreau-Yasuda fluid will be studied. A skin friction equation for the turbulent flow of Carreau-Yasuda fluids will be derived assuming a logarithmic behavior of the turbulent mean velocity for the near wall flow out of the viscous sub layer. An alternative near wall characteristic length scale which takes
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-06
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22. Numerical study of synthetic jet actuator effects in boundary layers
This work has as a fundamental objective the numerical study of the effects of synthetic jet actuators on the flow of the boundary layer developed on a flat plate and on a hypothetical airfoil. The aim is to obtain computational data to indicate how these effects may be used as a means of flow control, describing the dynamics of the synthetic jet in the pres
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-03
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23. Inclusion of the momentum perturbation in the kain-fritsch cumulus parameterization scheme and impacts on a convective rain case / Inclusão da perturbação de momentum no esquema de parametrização de cumulus kain-fritsch e impactos sobre um caso de chuva convectiva
The objective of this work is to insert the vertical transport of momentum through the mass flux in the Kain-Fritsch convective parameterization scheme. The momentum fluxes were inserted in the KF scheme in a similar way to the existing heat fluxes. Experiments were accomplished in the two domains, one experiment with cloud updraft (FM1) and one experiment i
Publicado em: 2007
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24. Study of image processing techniques for the Ovis aries semen s kinetic activity analysis / ESTUDO DE TÃCNICAS DE PROCESSAMENTO DE IMAGENS PARA ANÃLISE DA ATIVIDADE CINÃTICA EM SÃMEN DE OVIS ARIES
Image processing techniques have been widely used on the analysis and monitoring of several phenomena In farming it contributed with the process of animal reproduction aiming to eliminate human subjectivity when interpreting results in quality analysis of samples In the field of ruminants reproduction among others supervised attributes it was analyzed the wh
Publicado em: 2007