Rarefied Flow
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Numerical investigation of aerothermodynamic in a reentry vehicle with surface discontinuity-like cavity / Investigação numérica da aerotermodinâmica de veículos na reentrada com imperfeições na superficie do tipo cavidade
In the design of hypersonic vehicles, the knowledge of factors that affects the thermal and aerodynamic loads acting on the vehicle surface becomes imperative. Usually, in the thermal load calculations, the analysis assumes that the vehicle has a smooth surface. However, discontinuities or imperfections are present on the surface of reentry vehicles. In this
Publicado em: 2010
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2. Fluxo de gases rarefeitos em dutos cilíndricos : uma abordagem via equações integrais / Rarefied gases flow in cylindrical tube: an approach with integral equations
Neste trabalho, é estudada a descrição do fluxo de um gás rarefeito em um duto cilíndrico de comprimento infinito. A formulação matemática do problema está baseada na forma integral de equações cinéticas derivadas da Equação de Boltzmann. Particularmente são estudados os modelos cinéticos conhecidos como BGK e S. Métodos espectrais são prop
Publicado em: 2009
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3. Simulação direta molecular da influência de degraus na superfície de veículos na reentrada / Direct molecular simulation of step influence on a reentry vehicle surface
No projeto de veículos hipersônicos, o conhecimento dos fatores que afetam as cargas térmicas e aerodinâmicas que agem na superfície do veículo se torna imperativo. Usualmente, no cálculo das cargas térmicas, a análise assume que o veículo possui um contorno livre de imperfeições. No entanto, descontinuidades estão presentes na superfície de ve
Publicado em: 2009
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4. Simulação direta molecular da influência de degraus na superfície de veículos na reentrada / Direct molecular simulation of step influence on a reentry vehicle surface
No projeto de veículos hipersônicos, o conhecimento dos fatores que afetam as cargas térmicas e aerodinâmicas que agem na superfície do veículo se torna imperativo. Usualmente, no cálculo das cargas térmicas, a análise assume que o veículo possui um contorno livre de imperfeições. No entanto, descontinuidades estão presentes na superfície de ve
Publicado em: 2009
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5. Gas-surface interaction effect on round leading edge aerothermodynamics
Effects of incomplete surface accommodation in rarefied gas flow have been studied by using the Direct Simulation Monte Carlo (DSMC) method in conjunction with the Cercignani-Lampis-Lord gas surface interaction model. The DSMC calculations examine differences in predictions of aerodynamic forces and heat transfer between full and partial surface accommodatio
Brazilian Journal of Physics. Publicado em: 2007-06
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6. Simulation of blunt leading edge aerothermodynamics in rarefied hypersonic flow
The steady-state aerodynamic characteristics of a new family of blunted leading edges immersed in a high-speed rarefied air flow are examined by using a Direct Simulation Monte Carlo (DSMC) Method. A very detailed description of the flow properties has been presented separately at the vicinity of the nose and adjacent to the afterbody surface of the leading
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2007-06
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7. Leading-edge bluntness effects on aerodynamic heating and drag of power law body in low-density hypersonic flow
A numerical study is reported on power law shaped leading edges situated in a rarefied hypersonic flow. The sensitivity of the heat flux and drag coefficient to shape variations of such leading edges is calculated by using a Direct Simulation Monte Carlo method. Calculations show that the stagnation point heating on power law leading edges with finite radius
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-09
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8. Hypersonic flow of rarefied gas near the Brazilian satellite during its reentry into atmosphere
To calculate aerothermodynamic characteristics of the Brazilian satellite SARA (Portuguese abbreviation: SAtélite de Reentrada Atmosférica) during its re-entry the Direct Simulation Monte Carlo method is applied. The numerical calculations were carried out in a wide range of the gas rarefaction beginning from the free molecular regime up to the hydrodynami
Brazilian Journal of Physics. Publicado em: 2003-06
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9. Direct Simulation Monte Carlo Method Applied to Aerothermodynamics
An axisymmetric supersonic flow of rarefied gas past a finite cylinder was calculated applying the direct simulation Monte Carlo method. The drag force, the coefficients of pressure, of skin friction, and of heat transfer, the fields of density, of temperature, and of velocity were calculated as function of the Reynolds number for a fixed Mach number. The va
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001