Grid Refinement
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. A new particle-like method for high-speed flows with chemical non-equilibrium
Abstract: The present work is concerned with the numerical simulation of hypersonic blunt body flows with chemical non-equilibrium. New theoretical and numerical formulations for coupling the chemical reaction to the fluid dynamics are presented and validated. The fluid dynamics is defined for a stationary unstructured mesh and the chemical reaction process
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
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2. In-Situ combustion : insights on field project and numerical simulation at laboratory and field scale / Combustão In-Situ : considerações sobre projeto e simulações numéricas em escala de laboratório e de campo
Behavior forecast of reservoirs subjected to in-situ combustion is hard and empirical since besides geological complexities it is necessary to reproduce complex fluid models and several chemical reactions that are part of the process. The work flow for field project usually involves: 1) reservoir screening; 2) thermo-analytical experiments; 3) combustion tub
Publicado em: 2010
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3. An assessment of unstructured grid finite volume schemes for cold gas hypersonic flow calculations
Abstract: A comparison of five different spatial discretization schemes is performed considering a typical high speed flow application. Flowfields are simulated using the 2-D Euler equations, discretized in a cell-centered finite volume procedure on unstructured triangular meshes. The algorithms studied include a central difference-type scheme, and 1st- and
J. Aerosp. Technol. Manag.. Publicado em: 2009-12
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4. Modelagem de injeção de agua acima da pressão de fratura do reservatorio atraves de poço horizontal virtual / Modeling water injection above reservoir formation parting pressure through a virtual horizontal well
Water injection has been the most used method to improve oil recovery. The main problem of this method, related directly with operational efficiency, is the injectivity loss which is the loss of capacity to maintain water injection rates due to formation damage. Different models have been proposed to minimize the injectivity loss effects due to its high econ
Publicado em: 2007
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5. 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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6. Nonequilibrium modeling of an ammonia-water rectifyng column via fundamental thermodynamic and transport relations
A nonequilibrium heat and mass transfer model is presented for the steady-state operation of a rectifying column, employed in ammonia-water absorption refrigeration systems to dehumidify the ammonia vapor leaving the generator. The thermodynamic state relations of the mixture are derived from two equations representing the Gibbs free energy in terms of tempe
Brazilian Journal of Chemical Engineering. Publicado em: 2006-12
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7. Multi-dimensional discretization error estimation for convergent apparent order
This work presents procedures for estimating the error of numerical solutions of multi-dimensional problems. It is considered that: the numerical error is caused only by truncation errors; error estimations are based on the Richardson extrapolation; and numerical approximations are one-dimensional over uniform grids in each dimension. Two cases are analyzed:
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-12
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8. Expansionbydilationanderosionwithaviewtoskeletonandcontourextractionindigitalimages / Expansão por dilatação e por erosão visando a extração de esqueletos e contornos em imagens digitais
The motivation of this work comes from the observation of some discrete plane limitations, especially those related with the skeleton and contour extraction. The objective is to overcome these limitations. The methodology consists of using domain transformations. The main contribution is the introduction of an expansion for labeled images and the study of it
Publicado em: 2005
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9. 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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10. Three-dimensional turbulent flow simulations over aerospace configurations.
The main objective of the present research work consists of studying turbulent flows over typical aerospace configurations. In order to accomplish such goal, a numerical tool to simulate 3-D compressible flows is validated and improved. A finite difference method for structured grids, written for general curvilinear coordinates, is used. A centred spatial di
Publicado em: 2002
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11. 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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12. Simulação numerica de poços horizontais em reservatorios com fluxo multifasico, usando refinamento local
Recent developments in completion and drilling technology have increased the interest of the oil industry in horizontal wells. Such wells are primarily indicated for thin oil reservoirs associated with a gas cap or a bottom water zone, where vertical wells have productivity impaired by the formation of water or gas cones. The main purpose of this work is to
Publicado em: 1990