Direct Simulation Monte Carlo
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Simulação da dinâmica do estado excitado em semicondutores orgânicos / Simulation of the excited state dynamics in organic semiconductors
In the present work, the Monte Carlo method and the direct numerical integration of the Master Equation were employed to simulate the excitation spectral diffusion process in light emitting polymeric systems. The methodology employed a competition among the internal intra-molecular relaxation, the inter-molecular incoherent energy transfer via Förster mecha
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2012
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2. Simulação do fluxo reacional de um reator de filamento quente através da simulação direta de Monte Carlo / Simulation of reactive flow of hot filament reactor by direct simulation Monte Carlo
Neste trabalho foi desenvolvido um modelo computacional para simular o ambiente gasoso presente em um reator de filamento quente na obtenção de filmes de diamante através da deposição química à partir da fase gasosa. Foram estudados alguns mecanismos de crescimento aceitos pela comunidade científica e alguns modelos matemáticos de interação das es
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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3. 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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4. Potential performance of SiC and GaN based metal semiconductor field effect transistors
A Monte Carlo simulation has been used to model steady-state electron transport in SiC and GaN field effect transistor. The simulated device geometries and doping are matched to the nominal parameters described for the experimental structures as closely as possible. Simulations of SiC MESFETs of lengths 2, 2.6 and 3.2 µm have been carried out and compared t
Brazilian Journal of Physics. Publicado em: 2009-03
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5. 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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6. 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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7. SISTEMA DE GESTÃO DE LOGÍSTICA DE TRANSPORTE DE GÁS NATURAL POR GASODUTOS / LOGISTIC MANAGEMENT SYSTEM FOR NATURAL GAS TRANSPORTATION BY PIPELINE
An efficient management of the natural gas business chain, based on pipeline transmission network and taking into consideration the interaction between the main players such as Shippers, Suppliers, Transmission Companies and Local Distribution Companies, requires the use of information technology and decision-making support systems. This work presents a Natu
Publicado em: 2008
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8. Design of an automatic landing system using linear quadratic tracker.
This work presents the application of the Linear Quadratic Tracker (LQT) for the automatic landing system of passenger transport airplanes. The design method to achieve an autoland flare law with improved performance and disturbance rejection is described. With this method the design is direct and more formal thus avoiding the somewhat time consuming and mor
Publicado em: 2008
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9. 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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10. 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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11. Fator S astrofisico para a reação de captura 4He(t,g)7Li pela investigação da reação de transferência elástica no sistema 7Li + 4He / Astrophysical S factor for the 4He(t,g)7Li capture reaction by the investigation of the elastic-transfer reaction in the 7Li + 4He system
The normalization coefficient for the non-resonant part of the 3H(alpha,gama)7Li capture reaction (or alternately, the astrophysical S-factor) was obtained with the indirect method ANC (Asymptotic Normalization Coefficients). In this method the spectroscopic factor (or alternately, the ANC) is extracted from the investigation of a peripheral transfer reactio
Publicado em: 2007
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12. Effects of compressibility on aerodynamic surface quantities over low-density hypersonic wedge flow
Hypersonic flow past truncated wedges at zero incidence in thermal non-equilibrium is investigated for a range of Mach number from 5 to 12. The simulations were performed by using a Direct Simulation Monte Carlo (DSMC) Method. The study focuses the attention of designers of hypersonic configurations on the fundamental parameter of bluntness, which can have a
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09