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Direct simulation Monte Carlo of non-equilbrium rarefied flowsAlves, Nuno Franco Rodrigues January 2005 (has links)
No description available.
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Reduced kinetic mechanisms for chemical and process engineering applicationsBrad, Robert Boyd January 2005 (has links)
No description available.
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Escoamento hipersônico de um gás rarefeito ao redor de uma esferaYamamura, Cristina Sanae January 2001 (has links)
Orientador: Felix Sharipov / Dissertação (mestrado) - Universidade Federal de Paraná
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Escoamento hipersônico de um gás rarefeito ao redor de uma esferaYamamura, Cristina Sanae January 2001 (has links)
Orientador: Felix Sharipov / Dissertação (mestrado) - Universidade Federal de Paraná / Resumo: Nesta dissertação foi investigado o problema do escoamento hipersônico de um gás monoatômico e rarefeito ao redor de uma esfera, utilizando o Método da Simulação Direta de Monte Cario. Os cálculos foram realizados para o numero de Mach (Ma) igual a 10 e 20 e para diversos números de Knudsen (Kn) no intervalo de 0,01 a 100, ou seja, abrangendo os regimes heterodinâmico, de transição e de moléculas livres. Foram calculados os coeficientes de arrasto, de atrito, de pressão e de transferência de calor. Os resultados são apresentados em gráficos e tabelas. Alem disso, as distribuições de densidade, de temperatura e do numero de Mach local sao apresentadas em diagramas. -Palavras chave: Aerotermodinâmica, Gases rarefeitos, Escoamento hipersônico, Simulação Direta de Monte Cario, Coeficiente de arrasto. / Abstract: In this dissertation, the problem of a hypersonic flow of monoatomic rarefied gas past a sphere was investigated, applying the Direct Simulation Monte Carlo method. The calculations were carried out for the Mach number (Ma) equal to 10 and 20 in the range of the Knudsen numbers (Kn) from 0,01 to 100, i. e. for the hydrodynamic, transition and free-molecule regimes. The drag coefficient, the pressure coefficient, the friction coefficient and the heat transfer coefficient were calculated. The results are presented in graphics and tables. Also, the distributions of density, temperature and local Mach number are presented in diagrams.
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Teoria cinética de um gás monoatômico densoRosa Junior, Epaminondas, 1953- January 1987 (has links)
Orientador: Gilberto Medeiros Kremer / Dissertaçao (mestrado) - Universidade Federal do Paraná / Resumo: Desenvolvemos uma teoria cinética de gases densos segundo o modelo proposto por Enskog baseando-nos no método dos momentos de Grad. Analisamos o problema de propagação de ondas longitudinais planas nos casos de 13 e 5 campos escalares. Através do método de iteração maxwelliana determinamos os coeficientes de transporte. / Abstract: We develope a kinetic theory of dense gases according to the model proposed by Enskog. The theory is based on Grad's moment method. We analyse the problem of longitudinal plane waves propagation in the cases of 13 and 5 scalar fields. Using a Maxwellian iteration method we determine the transport coefficients.
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Etudes Expérimentales et lois prédictives des foyers d'incendies / Experimental studies and predictive laws for fire sourcesBetting, Benjamin 21 September 2018 (has links)
Chaque année en France, les feux de compartiments donnent lieu à plus de 88 000 interventions impliquant plus de 15 000 personnes dont plusieurs centaines de décès et de blessés graves. Aujourd’hui, lors de ces feux, les prises de décision et les délais d’intervention des équipes de secours sont principalement basés sur des décisions humaines, fruits de l'expérience. Une connaissance parfaite de la situation, de son évolution dans le temps et des dangers qui peuvent apparaître est impossible. C’est en partie la cause majeure des mauvais chiffres répertoriés ci-dessus. En effet, les processus physicochimiques qui régissent les feux de compartiments et les situations collatérales extrêmement réactives et dangereuses sont complexes. La transition entre un feu localisé et un feu généralisé peut prendre plusieurs formes. L'un des vecteurs les plus importants dans la propagation de la combustion pour les feux de compartiments sont les fumées, du fait de leur température élevée (souvent supérieure à 600°C) et des quantités importantes d’énergie, sous forme de chaleur, qu'elles contiennent. Malgré leur extrême dangerosité, les fumées restent importantes à étudier car elles véhiculent de précieuses informations, notamment sur l’apparition de phénomènes thermiques redoutés par les pompiers. Afin de mener cette étude, une cellule expérimentale composé de deux containers maritimes a été installée sur le site de formation incendie des sapeurs-pompiers de Seine-Maritime. Cette plateforme va permettre, grâce à un brûleur alimenté en propane, de produire des fumées chaudes dans uneconfiguration dite « feu réel ». Elles seront analysées en partie grâce à une technique de mesure non intrusive, la PIV. Les mesures par PIV grands champs seront comparées à des simulations LES de l’expérience (FDS). La double compétence (numérique / expérimentale) est essentielle dans ce type d’étude où les données expérimentales souffrent d’un manque de résolution (spatiale et temporelle) mais pour autant représentent des informations nécessaires à la validation des codes. / Each year in France, compartment fires result in more than 88,000 interventions involving more than 15,000 people, including several hundred deaths and serious injuries. Today, during fire compartments, the decision-making of the rescue teams is mainly based on human decisions, as a result of the accumulated experience. However, a perfect knowledge of the situation, its evolution over time and the dangers that may appear is impossible. Therefore, studying the fumes is of major interest. Indeed, smoke remains important to study because it conveys valuable information, especially on the appearance of thermal phenomena feared by firemen. In order to carry out this study, an experimental cell made up of two maritime containers was installed on the site of the Seine-Maritime fire brigade fire training. This platform will produce hot smokes in a configuration called "real fire" thanks to a propane burner. In this study, the smoke dynamics in a large scale experimental setup is analyzed using a non-intrusive measurement technique such as PIV (Particle Image Velocity). All the performed measurements are compared with LES (Large Eddy Simulation) simulations of the experiment using Fire Dynamics Simulator (FDS). The double expertise (numerical / experimental) is essential in this type of study where the experimental data suffer from a lack of resolution (spatial and temporal) but nevertheless represents an important source of information necessary for the validation of the codes.
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