Turbulence Modeling
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. The "upwind" scheme to the conservation laws and their application in simulation of 2D and 3D incompressible laminar and turbulent flows with free surfaces / Um esquema "upwind" para leis de conservação e sua aplicação na simulação de escoamentos incompressíveis 2D e 3D laminares e turbulentos com superfícies livres
Althought the PDEs that model conservation laws and fluid dynamics problems are well established, their numerical solutions have presented a continuing challenge. In particular, there are two challenges associated with the computation and the understanding of these problems, namely, formation of shocks and turbulence. Both challenges can be attributed to the
Publicado em: 2009
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14. Modelagem de uma chama de difusão turbulenta pela simulação de grandes escalas. / Modeling of a turbulent diffusion flame with the method of large eddy simulation.
The mean goal of this work was to better understand the dynamics of turbulent diffusion flames. The turbulent flow was resolved appling the methodology of Large Eddy Simulation, coupled with the Flamesheet model for reactive systems. The effects of the turbulent subgrid dissipation were accounted with the Smagorinsky (1963) subgrid model. The numerical code
Publicado em: 2009
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15. Detailed Two-Dimensional Numerical Analysis of Multiphase Flows / Análise numérica detalhada de escoamentos multifásicos bidimensionais
The mathematical modeling of multiphase flows involves the interaction between deformable and moving geometries with the fluid in which they are dispersed (immersed). This kind of interaction is present in many practical applications. A common approach to handle these problems is the so called Front-Tracking/Front-Capturing Hybrid Methods. This methodology c
Publicado em: 2007
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16. Detailed Two-Dimensional Numerical Analysis of Multiphase Flows / AnÃlise numÃrica detalhada de escoamentos multifÃsicos bidimensionais
The mathematical modeling of multiphase ows involves the interaction between deformable and moving geometries with the uid in which they are dispersed (immersed). This kind of interaction is present in many practical applications. A common approach to handle these problems is the so called Front-Tracking/Front-Capturing Hybrid Methods. This methodology consi
Publicado em: 2007
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17. Estudo e modelagem de canal optico atmosferico utilizando o Lightsim como plataforma de simulação / Study and modeling of atmospheric optical channel using lightsim as simulation platform
This is a study and simulation on free space optical communication analyzing many factors that can influence the transmitted signal quality. The use of an atmospheric channel to propagate optical signal is called FSO, Free Space Optics, and it is a cheap alternative for low length paths, because the low cost in it development, installation and maintenance. T
Publicado em: 2007
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18. Numerical analysis of the turbulent coaxial jets / Análise numérica de jatos coaxiais turbulentos
The understanding of the jets behavior is of extreme importance in several practical applications in combustion and propulsion. Therefore, it becomes more and more important the detailed analysis of the parameters that affect the characteristics of this type of flow. This work presents a numerical study of the incompressible turbulent coaxial jets characteri
Publicado em: 2007
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19. Método da fronteira imersa aplicado à modelagem matemática e simulação numérica de escoamentos turbulentos sobre geometrias móveis e deformáveis / Immersed boundary method applied to mathematical modeling and numerical simulation of turbulent flow over moving and deformable boundaries
A modelagem matemática de escoamentos turbulentos sobre geometrias complexas móveis possui uma extensa área de aplicações práticas e por isso ocupa lugar de destaque nas pesquisas recentes em engenharia. Uma linha proposta para o tratamento numérico deste tipo de problemas são os métodos de fronteira imersa. Esta metodologia, ainda em desenvolviment
Publicado em: 2006
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20. MODELAMENTO MATEMÁTICO DA ZONA DE MISTURA DE AÇOS EM LINGOTAMENTO CONTÍNUO
The increase of the production of steels through continuous casting machines requires long ladle sequences without interruption; if this condition is achieved it brings out stability and safeness and also reduction of operational cost. Companhia Siderúrgica de Tubarão (CST) arrival at the hot rolled coil market is demanding flexibility to supply small tonn
Publicado em: 2006
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21. 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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22. 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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23. 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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24. Estratégias "upwind" e modelagem k-epsilon para simulação numérica de escoamentos com superfícies livres em altos números de Reynolds / Upwind strategies and k-epsilon modeling for numerical simulation of free surface flow at high Reynolds numbers
This work is devoted to the analysis and implementation of modern high-order upwind schemes and the standard k-epsilon turbulence model into the Freeflow-2D; a finite difference integrated environment for the numerical simulation of incompressible free surface flow problems. The purpose of this study is the two-dimensional simulation of high-Reynolds incompr
Publicado em: 2005