Unstructured Grid
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. 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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14. 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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15. Esquema numérico com reconstrução mínimos quadrados de alta ordem em malhas não-estruturadas para a formulação euleriana do transporte de partículas / Numerical scheme with high order least square reconstruction on unstructured grid to eulerian formulation of the particle transport
The particle transport study has a fundamental importance in diverse research area like in the icing accretion on an aircraft because that can affect its sustentation and stability. The concern is so big that many researches have been carried through, resulting in computational codes like the LEWICE in the United States, TRAJICE in the United Kingdom, ONERA
Publicado em: 2008
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16. On the behavior of upwind schemes applied to three-dimensional supersonic and hypersonic cold gas flow simulations of aerospace configurations.
The present work describes the efforts towards the implementation of upwind schemes to simulate supersonic and hypersonic cold gÃs flows. The class of flux vector splitting schemes has been chosen, and the particular methods implemented are the van Leer and Liou schemes. Results for different freestream Mach numbers and mesh topologies are discussed in orde
Publicado em: 2007
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17. Unsteady aerodynamic forces for aeroelastic analysis of two-dimensional lifting surfaces
The present work is part of an effort for developing a methodology for the aeroelastic analysis of two-dimensional lifting surfaces using an unsteady, Euler-based, CFD tool for the calculation of the aerodynamic operator. The CFD tool solves the flow problem with the finite-volume method applied to an unstructured grid context. The proposed methodology is ba
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12
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18. Simulação numérica para difusão anisotrópica / Numerical simulation to anisotropic diffusion
The present work build a computational model using the finite volumes method for unstructured meshes, with the purpose of calculating the hydraulic load in a porous medium, considering it material non - homogeneous and anisotropic. The Anisotropy is a characteristic of many materials found in the nature and it depends on the property studied in this material
Publicado em: 2006
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19. Evidence grids with omnidirectional stereovision for mobile robots. / Grades de evidência com visão estéreo omnidirecional para robôs móveis.
Autonomous mobile robots depend on information acquired with its sensors to make decisions during its task. The use of vision systems provide a large amount of data about the environment in which the robot is. Particularly, an omnidirectional vision systems provide information in all directions of the environment to the robot with just one image. Through the
Publicado em: 2004
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20. On the development of an agglomeration multigrid solver for turbulent flows
The paper describes the implementation details and validation results for an agglomeration multigrid procedure developed in the context of hybrid, unstructured grid solutions of aerodynamic flows. The governing equations are discretized using an unstructured grid finite volume method, which is capable of handling hybrid unstructured grids. A centered scheme
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-12
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21. Numerical study of wedge supported oblique shock wave-oblique detonation wave transitions
The results of a numerical study of premixed Hydrogen-air flows ignition by an oblique shock wave (OSW) stabilized by a wedge are presented, in situations when initial and boundary conditions are such that transition between the initial OSW and an oblique detonation wave (ODW) is observed. More precisely, the objectives of the paper are: (i) to identify the
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2002-07
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22. Numerical simulation of three-dimensional flows over aerospace configurations.
The objective of this project is to study three dimensional aerodynamic flows over realistic aerospace configurations, such as the first Brazilian Satellite Launcher (VLS) in its first stage flight form. In order to achieve this objective, computational fluid dynamics and three dimensional adaptive mesh refinement techniques are used. The project focus in fi
Publicado em: 2002
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23. An unstructured grid approach to the solution of axisymmetric launch vehicle flows.
A study of the flowfield around axisymmetric launch vehicles in different flight conditions and configurations is performed in this work. Particularly, the VLS second stage flight configuration is analyzed considering the case with and without a propulsive jet in the vehicle base. Among the different cases considered for this configuration there are inviscid
Publicado em: 2001
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24. Fast methods for the Eikonal and related Hamilton– Jacobi equations on unstructured meshes
The Fast Marching Method is a numerical algorithm for solving the Eikonal equation on a rectangular orthogonal mesh in O(M log M) steps, where M is the total number of grid points. The scheme relies on an upwind finite difference approximation to the gradient and a resulting causality relationship that lends itself to a Dijkstra-like programming approach. In
The National Academy of Sciences.