Quadrilateral
Mostrando 13-24 de 41 artigos, teses e dissertações.
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13. Two efficient hybrid-trefftz elements for plate bending analysis
This study is devoted to the analysis of the Reissner-Mindlin plate bending. In this paper, the hybrid-Trefftz strategy will be utilized. Two novel and efficient elements are formulated in details. They are a Triangular element (THT) and a quadrilateral element (QHT), which have 9 and 12 degrees of freedom, respectively. In this approach, two independent dis
Latin American Journal of Solids and Structures. Publicado em: 2012
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14. TÃcnicas para geraÃÃo de malhas de quadrilÃteros convexos e sua aplicaÃÃo em reservatÃrios naturais / Techniques for generating convex quadrilateral meshes and its application in natural reservoirs
Esta dissertaÃÃo descreve quatro mÃtodos implementados para realizar uma quadrilaterizaÃÃo convexa do espaÃo bidimensional que pode conter linhas poligonais ou buracos. Dois destes mÃtodos, ponto mÃdio e ortoquad, utilizam de elementos guia, o baricentro de uma regiÃo ou o locus de cÃrculos mÃximos tangentes e internos a geometria, para produzir u
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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15. Simulação harmônica particionada usando um método baseado em multiplicadores de Lagrange / Harmonic simulation partitioned using a method based on Lagrange multipliers
Atualmente, existe uma grande tendência no incremento da produção de energia elétrica através de fontes renováveis. Em especial, a geração de energia elétrica produzida através de parques eólicos tem sido bastante adotada. O projeto desses equipamentos envolve a modelagem dinâmica acoplada solo-fluido-estrutura que pode ser estudada usando-se a f
Publicado em: 2011
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16. Análise numérica das zonas de recirculação do escoamento laminar à jusante de uma expansão brusca.
No presente trabalho são apresentadas simulações bi e tridimensionais de escoamentos em canais com expansão brusca, usando dinâmica de fluidos computacional (CFD). O objetivo é analisar as zonas de recirculação formadas à jusante da expansão para escoamentos laminares. As configurações geométricas são baseadas em trabalhos experimentais com raz
Publicado em: 2009
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17. A questão da argumentação e prova na matemática escolar: o caso da medida da soma dos ângulos internos de um quadrilátero qualquer
This study is placed in the context of teaching and learning of mathematical proofs and arguments by students of middle school, developed under the Project Reasoning and Proof in School Mathematics (AProvaME). The aim of the work refers to map the concepts of argumentation and proofs of adolescent students aged between 14 and 16 years of public and private s
Publicado em: 2009
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18. Aspects of finite element and finite volume equivalence and a posteriori error estimation in polymer melt flow
In this work, aspects of discretization errors associated with finite volume (FV) and equivalent finite element (FE) modelling strategies are discussed within the framework of polymer melt flow. The computational approaches are based on the generalized Newtonian model in conjunction with Cross constitutive equation. The numerical examples illustrate one and
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-09
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19. Proposta de uma oficina para a prática docente no ensino fundamental: utilizando o Cabri na investigação de quadriláteros
The objective of this study is to suggest a workshop about learning practice to basic education teachers using the dynamic Geometry provided by Cabri Géomètre software. The main investigation was: how would Dynamic Geometry create a learning atmosphere for the study of notable quadrilateral? The hypothesis was that the development of the activities with th
Publicado em: 2008
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20. Grid generation and adaptation by functionals
Accuracy of a simulation is strongly depend on the grid quality. Here, quality means orthogonality at the boundaries and quasi-orthogonality within the critical regions, smoothness, bounded aspect ratios, solution adaptive behavior, etc. We review various functionals for generating high quality structured quadrilateral meshes in two dimensional domains. Anal
Computational & Applied Mathematics. Publicado em: 2007
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21. Irregular polygon partitioning on the biaxial ellipsoid on the surface of the Lambert azimuthal equal-area projection / DIVISÃO DE POLÍGONOS IRREGULARES DO ELIPSÓIDE BIAXIAL NA SUPERFÍCIE DA PROJEÇÃO AZIMUTAL EQUIVALENTE DE LAMBERT
This dissertation supplies the methodology of the measure (area) in the Earth model adopted for Geodesy. This model is the ellipsoid of revolution, in which the system of Cartesian coordinates, the curvilinear coordinate system and the polar coordinate system are described. The coordinate nature in the development of the surface measure calculation is discus
Publicado em: 2007
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22. Numerical simulation of pollutants dispersion by a finite element method based on control volumes / Simulação numerica de dispersão de poluentes pelo metodo de elementos finitos baseado em volumes de contole
The dispersion of pollutant species in the environment is a problem of interest due to the bad quality of the air that this can originate, mainly, in big cities. Numerical and experimental tools have been developed and used to predict the behavior of the dispersion of pollutants in the atmosphere. In this work, computational codes have been developed in Fort
Publicado em: 2007
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23. Sobre metodologias de modelagem computacional de propagação de trincas por fadiga em fuselagens aeronáuticas. / On computacional modeling methodologies of fatigue crack propagation in aircraft fuselages.
A methodology for modeling fatigue crack growth in pressurized, stiffened, thin shell structures is implemented within a software framework that consists of a fracture simulation code associated with a finite element analysis code. Crack trajetories are allowed to be arbitrary and are computed incrementally as a part of the simulation. Trajectories are repre
Publicado em: 2007
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24. A computational methodology for automatic two-dimensional anisotropic mesh generation and adaptation
This paper describes a versatile computational program for automatic two-dimensional mesh generation and remeshing adaptation of triangular, quadrilateral and mixed meshes. The system is flexible to be incorporated into an adaptive global or local remeshing procedure and for generating both, iso and anisotropic meshes. The main contribution of this work is t
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12