Finite Difference Method
Mostrando 13-24 de 159 artigos, teses e dissertações.
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13. On Convergence and Solvability of an Elliptic Equation by Finite Difference Method
RESUMO Neste artigo tratamos as questões de convergência, existência e unicidade da solução numérica de um problema elíptico discretizado pelo método de diferenças finitas. A fim de provarmos a existência e unicidade da solução numérica, usaremos uma configuração variacional adequada (em nível discreto) para garantirmos a existência de uma s
TEMA (São Carlos). Publicado em: 2017-04
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14. Analysis of Spinodal Decomposition in Al-Zn and Al-Zn-Cu Alloys Using the Nonlinear Cahn-Hilliard Equation
The phase field model based on the nonlinear Cahn-Hilliard equation was applied to analyze the spinodal decomposition process in Al-Zn and Al-Zn-Cu alloys. Partial differential equations were solved using the explicit finite difference method for the Al- 20, and 35 at. % Zn alloys aged at temperatures between 25 and 100 °C for times from 10 s to 2000 s and
Mat. Res.. Publicado em: 20/03/2017
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15. Realistic deformable 3D numeric phantom for transcutaneous ultrasound
Abstract Introduction Numerical phantoms are important tools to design, calibrate and evaluate several methods in various image-processing applications, such as echocardiography and mammography. We present a framework for creating ultrasound numerical deformable phantoms based on Finite Element Method (FEM), Linear Isomorphism and Field II. The proposed met
Res. Biomed. Eng.. Publicado em: 16/03/2017
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16. Computational Modeling of Geoelectrical Soundings using PML-FDTD
Abstract The Finite-Difference Time-Domain (FDTD) method was applied in order to analyze the transient responses of geoelectrical soundings that use circular electric dipole (CED) as source over stratified formations. The model was developed in cylindrical coordinates and a perfectly matched layer (PML) was incorporated to the domain to absorb wave reflectio
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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17. Transient Stress Intensity Factors of Functionally Graded Hollow Cylinders with Internal Circumferential Cracks
Abstract In this paper, transient thermomechanical stress intensity factors for functionally graded cylinders with complete internal circumferential cracks are obtained using the weight function method. The finite difference method is used to calculate the time dependent temperature distribution and thermal stresses along the cylinder thickness. Furthermore,
Lat. Am. j. solids struct.. Publicado em: 2016-09
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18. Spectral Method for Localization of Multiple Partial Discharges in Dielectric Insulation of Hydro-Generator Coils: Simulation and Experimental Results
Abstract A methodology based on spectral analysis for localization of multiple partial discharges in dielectric region of hydro-generator coils is proposed. This pinpointing of multiple discharges aims to provide means for performing diagnosis of insulating regions of the coil. A numerical model of the structure was developed by using the finite-difference t
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-09
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19. NUMERICAL SIMULATION OF THE INCOMPRESSIBLE TURBULENT FLOW OF A BINARY MIXTURE OF AIR-WATER VAPOR: APPLICATIONS IN DRYING PROCESS
Abstract The present work deals with numerical simulation of the incompressible turbulent flow of a binary mixture air-water vapor inside channels. Calculations are performed using the RANS (Reynolds Average Navier-Stokes Equations) formulation in addition to the standart k-ε turbulence model. The mathematical model is discretized by a finite difference sch
Braz. J. Chem. Eng.. Publicado em: 2016-06
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20. An Investigation on the Deformation Heating in Billet and Die During Equal-Channel Angular Pressing and High-Pressure Torsion
This work aims to investigate the temperature rise in Aluminum alloy 6061 due to deformation heating in equal channel angular pressing (ECAP) and high-pressure torsion (HPT) processes using finite element method. The roles of various parameters are investigated and the heating of ECAP die due to billet deformation is included in the simulations. The results
Mat. Res.. Publicado em: 19/04/2016
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21. Analysis and Comparison of Sensors for Measurements of Partial Discharges in Hydrogenerator Stator Windings
Abstract In order to measure electrical signals produced by partial discharges in hydrogenerators stator windings, capacitive couplers are regularly used. They are electrically connected to the windings and therefore, require undesired insulation intrusion. For avoiding such an intrusion, a microstrip directional coupler is used, which is experimentally and
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-12
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22. Parametric Model Method and Deployment Simulation of Inflatable Antenna Structures
ABSTRACT: In this paper, we develop a parametric model method and simulate the deployment mechanism of inflatable antenna structures. Different folded methods are developed for the primary members of inflatable antenna structures, which include inflatable tubes, an inflatable torus, a reflector etc. The unstressed configuration and the folded configuration o
J. Aerosp. Technol. Manag.. Publicado em: 2015-06
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23. STEADY STATE AND PSEUDO-TRANSIENT ELECTRIC POTENTIAL USING THE POISSONBOLTZMANN EQUATION
A method for analysis of the electric potential profile in saline solutions was developed for systems with one or two infinite flat plates. A modified Poisson-Boltzmann equation, taking into account nonelectrostatic interactions between ions and surfaces, was used. To solve the stated problem in the steady-state approach the finite-difference method was used
Braz. J. Chem. Eng.. Publicado em: 2015-03
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24. Numerical Study of Wall Ventilation in a Transonic Wind Tunnel
ABSTRACT: Transonic wind tunnels (TWT) are sophisticated tools for the investigations of flows with Mach numbers of order one. The most characteristic feature of a facility such as this is, for sure, the openings in the walls of the test section. The openings in the walls permit the proper relief effect, and this, on the other hand, makes possible the experi
J. Aerosp. Technol. Manag.. Publicado em: 2015-03