Direct Numerical Simulation
Mostrando 13-24 de 57 artigos, teses e dissertações.
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13. Avaliação do comportamento solo-estrutura de elementos de fundação tipo sapata estaqueada / Assessment of the behavior of soil-structure foundation elements like piled footing
This work aims to study the behavior and interaction between soil, shallow footing and pile, based on the implementation and monitoring of four direct load tests performed on: a single shallow footing, a shallow footing with one pile, a shallow footing with four piles and a pile alone. During the load tests, vertical displacements were monitored at different
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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14. On the evaluation of linear and non-linear models using DNS data of turbulent channel flows
In this paper, a priori and a posteriori analyses of algebraic linear and non-linear models are carried out in order to compare their ability to predict near wall turbulent flows. Tests were done using data from a direct numerical simulation (DNS) of a plane channel flow for three Reynolds numbers, based on the friction velocity, Reτ = 180, Reτ = 395 and R
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12
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15. 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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16. Constant Boundary Elements on graphics hardware: a GPU-CPU complementary implementation
Numerical simulation of engineering problems has reached such a large scale that the use of a parallel computing approach is required to obtain solutions within a reasonable time. Recent efforts have been made to implement these large scale computational tasks on general-purpose programmable graphics hardware (GPGPU). The Graphics Processing Unit (GPU) is sp
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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17. Two-dimensional control volume modeling of the resin infiltration of a porous medium with a heterogeneous permeability tensor
Resin Transfer Molding (RTM) is a polymer composite processing technique widely used in the aeronautics and automotive sectors. This paper describes the numerical simulation of the RTM process where Darcy’s law was used for the mathematical formulation of the problem. A control volume finite element method was used for the determination of pressure gradien
Publicado em: 2011
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18. 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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19. Ensaios de ondas ultrassônicas e redes neurais artificiais na avaliação da resistência à compressão do concreto
Stripping of formworks in reinforced concrete structures can only be done when concrete is hardened enough to carry the loads without generating unacceptable deformations. These are two important demands from Brazilian Code NBR 14931-2004. To get those conditions the structural design engineer should inform the building engineer the minimum values of compres
Publicado em: 2010
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20. Coherent vorticity extraction in 3D homogeneous isotropic turbulence: influence of the Reynolds number and geometrical statistics
The coherent vorticity extraction method (CVE) is based on the nonlinear filtering of the vorticity field projected onto an orthonormal wavelet basis made of compactly supported functions. CVE decomposes each turbulent flow realization into two orthogonal components: a coherent and an incoherent random flow. They both contribute to all scales in the inertial
Brazilian Journal of Physics. Publicado em: 2009-09
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21. Simulação numérica da evolução linear e não linear em uma camada de mistura compressível tridimensional / Numerical simulation of the linear and non-linear evolution in a three-dimensional compressible mixing layer
As aplicações aeroespaciais estão frequentemente associadas a escoamentos compressíveis com altíssimos números de Reynolds. No entanto, existem no contexto aeroespacial importantes aplicações que envolvem escoamentos compressíveis a Reynolds relativamente baixos. Entre eles se destacam o escoamento em pás de turbina a gás e ao redor de dispositivo
Publicado em: 2009
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22. Identificação de parâmetros materiais através da simulação numérica de um processo de estampagem profunda / Parameter identification based on deep drawing experiments
Numerical simulation of metal forming processes requires a constitutive model, which depends upon adequate material parameters. A direct determination of material parameters usually admits homogeneous stress and strain states in the specimen, thereby narrowing the application range to moderate deformations or even compromising accuracy in some industrial app
Publicado em: 2009
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23. Two-dimensional control volume modeling of the resin infiltration of a porous medium with a heterogeneous permeability tensor
Resin Transfer Molding (RTM) is a polymer composite processing technique widely used in the aeronautics and automotive sectors. This paper describes the numerical simulation of the RTM process where Darcy's law was used for the mathematical formulation of the problem. A control volume finite element method was used for the determination of pressure gradients
Materials Research. Publicado em: 2008-09
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24. AVALIAÇÃO DE DESEMPENHO TÉRMICO DE EDIFÍCIO INSTITUCIONAL ESTRUTURADO EM AÇO. O CASO DA SEDE DA PREFEITURA MUNICIPAL DE MARIANA, MG.
The evaluation of building thermal performance, by numerical simulation, can greatly contribute to improving the thermal comfort of built environments and a reduction in energy consumption, in the heating and / or cooling of environments, providing means to optimize projects in the energy performance of buildings. So when conditions for human comfort within
Publicado em: 2008