Finite Difference Technique
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Solução numérica do modelo PTT para escoamentos viscoelásticos com superfícies livres / Numerical solution of the PTT model for viscoelastic surface flows
The aim of this work is to develop a numerical method capable of simulating viscoelastic free surface flows governed by the non-linear constitutive equation PTT (Phan-Thien-Tanner). In this work three numerical methods to simulate vicoelastic Flows of fluids modelled by the PTT equation are presented. Two of these methods were developed to simulate two-dimen
Publicado em: 2006
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14. Estudo da obtenção de imagens de tomografia de impedância elétrica do pulmão pelo método de otimização topológica. / Study of electrical impedance tomography image reconstruction of lungs by topology optimization method.
The Electrical Impedance Tomography (EIT) is a recent monitoring technique on biological tissues. The EIT allows us to obtain images representing a transversal plane of any section of human body (head, thorax, thigh, etc). Each image pixel is related to its corresponding value of electrical impedance (or resistivity). The images are generated from voltage va
Publicado em: 2006
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15. Estudo da fluidodinâmica em leito fixo utilizando-se métodos numéricos de solução: escoamento monofásico de ar.
Studies accomplished in the structure of tubular fixed beds proved that the porosity in these systems presents an oscillatory behavior along the radial direction. The non-uniformity of the porosity generates a behavior of the velocity profile, inside the bed, characterized by oscillations in the central region and a peak of larger width in the region close t
Publicado em: 2006
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16. Physical and numerical simulations of the rotary continuous casting process / Simulação fisica e numerica do processo de lingotamento continuo rotativo
The present study describes the development of a static experimental set-up representing the solidification system of a Rotary Continuous Caster, as part of a metholology, which connected to a numerical model permits to determine transient global metal/mold heat transfer coefficients along solidification. By using this methodology the influence of air gap fo
Publicado em: 2005
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17. Seeding of Görtler vortices through a suction and blowing strip
The resulting wavelength of Görtler vortices in boundary layers over concave surfaces is determined by the upstream history of the flow and by wall disturbances such as roughness, heating/cooling strips or suction and blowing. In isotropic disturbance conditions, the predominant wise wavelength corresponds to the strongest growing vortex mode predicted by t
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-09
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18. MODELAGEM ACÚSTICA NO DOMÍNIO DA TRANSFORMADA WAVELET / ACOUSTIC MODELING IN THE WAVELET TRANSFORM DOMAIN
Seismic signal processing is a key step to oil exploration. The path between data acquisition and seismic interpretation is composed by a sequence of interdependent processes, among which are modeling and migration processes. A 2D acoustic modeling algorithm in wavelet Transform domain, based on custom tools and tools already made known in literature is pres
Publicado em: 2004
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19. A numerical solution for the entrance region of non-newtonian flow in annuli
Continuity and momentum equations applied to the entrance region of an axial, incompressible, isothermal, laminar and steady flow of a power-law fluid in a concentric annulus, were solved by a finite difference implicit method. The Newtonian case was solved used for validation of the method and then compared to reported results. For the non-Newtonian case a
Brazilian Journal of Chemical Engineering. Publicado em: 2003-06
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20. Simulação numerica de tratamento superficial por refusão a laser : interação radiação laser-materia e solidificação
In this work, a two dimensional numerical modei in cylindrical coordinates based on the finite difference technique is developed pennitting the description of the thermal field evolution during heating, fusion, solidification and cooling along the laser surface treatment processo The model predictions are compared to experimental results as well as to those
Publicado em: 2003
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21. Building a hydrological analysis and simulation system for drainage basin application. / Construção de um sistema de análise e simulação hidrológica: aplicação a bacias hidrográfica.
Hydrological models are useful tools to understand the hydrological behavior of watersheds. These models should represent most of hydrological processes to be able to produce realistic results. However, models are only an aproximation of the truth and they require good initialization of state variables and a large amount of data to properly represent the pro
Publicado em: 2003
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22. Simulação numérica de escoamentos multifásicos utilizando o sistema FreeFlow-2D. / Numerical simulation of multi-phase flows using the FreeFlow-2D system.
This work describes a method to expand the applicability of the system FreeFlow-2D in multi-phase flows problems. This method allows the simulation of incompressible free surface multi-phase flows. An arbitrary number of phases having different properties can be used. Surface and interface tension effects are also considered. The numerical technique is based
Publicado em: 2001
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23. ESTUDOS DA DEFORMABILIDADE DE ESCAVAÇÕES COM SOLO GRAMPEADO / DEFORMABILITY ANALYSIS OF SOIL NAILING EXCAVATIONS
The use of passive inclusion for soil reinforcements, technique usually known as soil nailing, has been gaining growing acceptance within civil engineering professionals, especially in Rio de Janeiro. However this technique lacks a more detailed study on the elevant parameters influencing the deformability of soil nailed masses. The nails are rigid inclusion
Publicado em: 2001
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24. Analysis of error in temperature measurement.
This work presents the numerical investigation of temperature measurement error using thermocouple for different configurations utilizing a computational tool based on finite element method (Galerkin Method). The numerical code performs a two-dimensional analysis while most of the analytical models are one-dimensional. The results are then compared with the
Publicado em: 2000