Largeeddy Simulation
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Solução via LES de chamas difusivas de metano, metanol e etanol
This work presents a model for a jet diffusion flame, for low Mach and high Damköhler numbers. The model is based on the solution of the flamelet equations for the chemistry and on the mixture fraction for the flow. This model describes well the behavior of diffusion flames, except at the flame tip, where instabilities can often occur. Numerical results are
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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2. Turbulent natural convection in enclosures using large-eddy simulation with localized heating from horizontal bottom surface and cooling from vertical surfaces
Turbulent natural convection of air that happens into inner square cavity with localized heating from horizontal bottom surface has been numerically investigated. Localized heating is simulated by a centrally located heat source on the bottom wall, and two values of the dimensionless heat source length ? are considered in the present work. Solutions are obta
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-09
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3. Efeitos de modelos submalha em escoamentos em ciclones
A Large-Eddy Simulation (LES) of a single-phase turbulent flow in flat bottom model cyclone geometry was performed. The chosen fluid has the physical properties of air, and the particulate phase was not considered in this work, so the underflow duct was not considered idem, which means that the simulated cyclone has only one output (the overflow duct). The c
Publicado em: 2009
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4. Large eddy simulation applied to reciprocating compressors
This paper considers the application of large-eddy simulation (LES) to predict the performance of hermetic reciprocating compressors utilized in refrigeration. In such devices the pressure difference between the suction/discharge chamber and the cylinder, established by the piston motion, is responsible for the valve opening. Once the valves are open, the fl
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-06
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5. Large-eddy simulation and hybrid RANS/LES simulation of the backwardfacing step flow with turbulent boundary conditions / Simulação de grandes escalas e simulação híbrida RANS/LES do escoamento sobre o degrau com condições de contorno turbulentas
A simulação numérica de escoamentos turbulentos através da hipótese de Boussinesq é representada, atualmente, por duas grandes metodologias distintas, a Simulação de Grandes Escalas (LES Large-Eddy Simulation) e as Equações Médias de Reynolds (RANS Reynolds Averaged Navier-Stokes). Uma nova metodologia, chamada de Híbrida RANS/LES, está em desen
Publicado em: 2006
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6. SimulaÃÃo de grandes escalas e simulaÃÃo hÃbrida RANS/LES do escoamento sobre o degrau com condiÃÃes de contorno turbulentas / Large-eddy simulation and hybrid RANS/LES simulation of the backwardfacing step flow with turbulent boundary conditions
A simulaÃÃo numÃrica de escoamentos turbulentos atravÃs da hipÃtese de Boussinesq à representada, atualmente, por duas grandes metodologias distintas, a SimulaÃÃo de Grandes Escalas (LES â Large-Eddy Simulation) e as EquaÃÃes MÃdias de Reynolds (RANS â Reynolds Averaged Navier-Stokes). Uma nova metodologia, chamada de HÃbrida RANS/LES, està em
Publicado em: 2006
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7. Largeeddy simulation in three dimentional liddriven cavities using dynamic models / SimulaÃÃo numÃrica de grandes escalas em cavidades tridimensionais com tampa deslizante utilizando modelagem dinÃmica
In the present work a numerical code of fourth order in space and third order in time, with dynamical turbulence model was developed. This code was applied in order to study turbulence transition in liddriven cavity flow in bi and threedimensional configurations. The simulations had been carried out for bi and threedimensional configurations. The twodimensio
Publicado em: 2006
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8. Largeeddy simulation in three dimentional liddriven cavities using dynamic models / Simulação numérica de grandes escalas em cavidades tridimensionais com tampa deslizante utilizando modelagem dinâmica
No presente trabalho foi implementado um código computacional de segunda ordem no tempo e de quarta ordem no espaço, com modelagem dinâmica da turbulência, apropriada para se analisar o processo de transição de escoamentos. São apresentados resultados de simulações numéricas de escoamentos em cavidades com tampa deslizante (liddriven cavity) em con
Publicado em: 2006
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9. Numerical modeling of settling processes in turbulent flows and channel re-suspension analysis / Modelação numérica de processos de sedimentação em escoamentos turbulentos e análise da ressuspensão em canais
O estudo do transporte de sedimentos, partindo da estimativa de estruturas turbulentas relevantes, constituiu o principal foco deste trabalho. Assim, a equação de transporte de massa (advecção-difusão) foi aplicada em conjunto com as equações de Navier-Stokes e da continuidade filtradas. Neste contexto, houve a necessidade de uma descrição convenien
Publicado em: 2006
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10. Dynamics of coherent vortices in mixing layers using direct numerical and large-eddy simulations
Coherent vortices in turbulent mixing layers are investigated by means of Direct Numerical Simulation (DNS) and Large-Eddy Simulation (LES). Subgrid-scale models defined in spectral and physical spaces are reviewed. The new "spectral-dynamic viscosity model", that allows to account for non-developed turbulence in the subgrid-scales, is discussed. Pseudo-spec
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2000